DE102007021381A1 - Valve arrangement for e.g. high pressure washer, has actuating device and control device formed as modular component, where actuating device is decoupled from closing body of bypass valve and influence on valve with actuating force - Google Patents

Abstract

The arrangement (1) has a bypass valve (15) for blocking a bypass line (14). The valve includes an actuating device (23) for completely opening the valve, during transition from supply mode to bypass mode. Another actuating device (36) keeps the valve open in the bypass mode. A pressure control device (17) reduces the output pressure onto a sustaining pressure in the bypass mode. The actuating device (36) and the control device are formed as a modular component. The actuating device (36) is decoupled from a closing body of the valve and influence on the valve with an actuating force.

Description

The The present invention relates to a valve arrangement for a high-pressure cleaning device according to the preamble one of the independent ones Claims, a high-pressure cleaning device with such a valve arrangement and a use of a counter rod for closing force compensation.

High-pressure cleaning devices also called high-pressure cleaners for short, are commonly used for cleaning purposes used. A liquid, especially water, is pressurized by a high pressure pump and usually one connected valve gun and nozzle issued. The high pressure cleaning devices are common provided with a valve assembly (unloader), so that when closing the Valve gun or nozzle and continuing pump the liquid recoverable in the circulation is, the pump so not against the closed valve gun or Nozzle is working.

Such a valve arrangement is for example from the DE 198 38 947 C1 which forms the starting point of the present invention. The valve arrangement has a supply line which can be connected on the inlet side to the pump of the high-pressure cleaning device. On the outlet side, a pressure line to a valve gun o. The like. Connected. The supply line is provided with a check valve, which is opened in the conveying operation of the liquid flowing through and closes when closing the valve gun - ie collapse of the liquid flow - also.

Upstream the check valve branches a bypass line from the supply line to the suction side of the pump or a reservoir for the liquid leads, So that the liquid with open bypass line from the pump in the circuit with low pressure drop can be conveyed is.

The bypass line is through a bypass valve in the normal production operation Lockout. In particular, the bypass valve has a valve or Closing body on, on the the fluid pressure in the supply line and the force of a closing spring in the closing direction Act.

Of the Closing body is can be opened by means of a first actuating device. The first actuating device has a switching piston which is against an adjustable spring force from the outlet pressure of the valve assembly against the closing body in the opening direction is movable.

If the valve gun is closed breaks the liquid flow the check valve together, and the check valve closes. simultaneously occurs downstream of the check valve a pressure pulse acting on the switching piston, so that this the closing body of his assigned valve seat lifts, so the bypass valve initially opens. Further becomes the bypass valve then by a second, the closing body associated actuator Completely open. In this bypass operation the check valve remains closed and the bypass valve open and becomes the liquid pumped from the pump in the circuit through the bypass line, provided they is not switched off.

The second actuating device holds the bypass valve in bypass mode open. The second actuator has an actuating piston connected directly to the closing body on, the output pressure of the valve assembly downstream of the check valve in the opening direction is charged. To the bypass valve against the force of a closing direction acting closing spring Accordingly, a relatively large pressure, below holding pressure, upstream of the check valve, So in the leading to the valve gun Pressure line required.

at the known valve arrangement is a lowering of the pressure in the pressure line in bypass mode via a Pressure control device with a pressure control valve, which of the second actuator actuated or is formed. The pressure reduction to a relatively low, certain lower holding pressure is used for safety, for example Injuries due to unintentional opening of the valve gun prevent. Furthermore, the material load of the closed Valve gun or nozzle reduced.

at the known valve assembly requires the direct coupling of actuating piston the second actuator with the closing body one relatively high Holding pressure and / or relatively high Control volumes with correspondingly long reaction or switching times.

at the known valve assembly is a complete opening of the bypass valve while of the entire bypass operation not available. Furthermore, an adaptation to different working pressures and / or flow rates difficult.

The EP 0 668 113 A1 discloses a high-pressure cleaning device with a basically similar valve arrangement with only one actuating device, which is firmly connected to the closing body of the bypass valve. The valve assembly also includes a pressure control valve for decreasing the discharge pressure to a lower holding pressure in the bypass mode, which opens when the discharge pressure downstream of the check valve by a certain amount greater than the pressure upstream of the check valve.

The DE 100 33 075 A1 discloses a similar valve assembly with a bypass for a high-pressure cleaner, wherein in turn a pressure control valve is provided for reducing the pressure of the discharge pressure to a lower holding pressure in the bypass mode.

Of the present invention is based on the object, a valve assembly for one High-pressure cleaning device and a high-pressure cleaning device with a valve assembly and a use of a counter rod indicate, while in bypass mode the holding pressure further lowered and / or the bypass valve remains fully open in the bypass mode and / or wherein the valve assembly can be used universally, individually configurable and / or customizable is.

The The above object is achieved by a valve arrangement according to claim 1, 3, 5, 7, 9 or 15 or by a high-pressure cleaning device according to claim 16 or solved by a use according to claim 18. advantageous Further developments are the subject of the dependent claims.

One Aspect of the invention lies in the second actuator and / or to execute the pressure control device as a modular unit, the In particular, if necessary, attachable to the valve assembly or in the valve assembly is integrable. This allows the structure a series of different valve arrangements, wherein certain Components to be installed as needed, desire and purpose.

One Another aspect of the invention lies in the second actuator and / or an actuating piston the second actuator from the closing body of the bypass valve to decouple. This allows a lowering of the holding pressure on one opposite the prior art lower value, in particular relative to Working pressure, in the present invention preferably very is high.

One Another aspect of the present invention is a mechanical translation and / or Deflection between the second actuator and the Closing body of bypass valve provided. This is conducive to further lowering the holding pressure.

One Another aspect of the present invention resides in the switching piston to initially open the bypass valve controlled again in his withdrawn from the bypass valve rest position move back, for hard work to avoid. Accordingly, the valve assembly is universal, in particular also for higher pressures used.

One Another aspect of the present invention resides in the bypass valve or its closing body with a working against the ambient pressure counter rod for closing force compensation to pair. In particular, the effective cross section of the counter rod and thus the pressure relief to the pressure load or the effective Diameter of the closing body or an associated valve seat adaptable to the on the closing body in closed state acting closing force even at different Diameters for different volume flows to be able to keep constant This in turn is a universal applicability of the valve assembly conducive, in particular where largely the same parts also for under different pressures and / or Volume flows - in particular at different diameters of the sealing seat of the bypass valve - used are.

Further Advantages, aspects, features and characteristics of the present invention arise from the claims and the following description of a preferred embodiment based on the drawing. It shows:

1 a block diagram-like view of a proposed valve assembly with an associated high-pressure cleaning device and a valve connected thereto via a pressure line valve gun;

2 a schematic section of the valve assembly in the conveying operation;

3 a schematic section of the valve assembly in the transition to the bypass operation; and

4 a schematic section of the valve assembly in the bypass mode.

1 shows an overview of a proposed valve arrangement 1 , in particular a high-pressure cleaning device 2 assigned in the aforementioned sense. In particular, the valve assembly 1 to the high pressure cleaning device 2 connected, more preferably attached to this or built into this or integrated in any other way.

The valve arrangement 1 is to a pump 3 , in particular high-pressure pump, the high-pressure cleaning device 2 for supplying or supplying a liquid 4 , in particular water or other cleaning fluid, connected. In principle, the valve arrangement 1 also to another pump, water supply o. The like. Connected and / or used for other purposes.

The present invention relates in particular to applications in which the pressure of the liquid 4 or the pump 3 is at least 5 MPa, preferably 10 to 50 MPa, especially about 30 to 50 MPa, or even more.

The liquid 4 in particular, a reservoir, such as a tank 5 , taken, however, the liquid can 4 in any other way the pump 3 be fed, for example, directly through a water hose, a water network o.

The valve arrangement 1 has a supply line 6 on the inlet side, preferably the liquid under high pressure 4 can be fed. In particular, the valve assembly 1 or supply line 6 with a connection or inlet 7 to the pump 3 connected.

To the supply line 6 is outlet side - in particular to an outlet or connection 8th the supply line 6 - Preferably a pressure line 9 , in particular a hose, connected, the or the high-pressure liquid 4 a valve device, in particular a valve gun 10 o. The like., For dispensing the liquid 4 preferably via a nozzle 11 , in particular in the form of a spray jet, 12 feeds.

The valve pistol 10 with the nozzle 11 can also be understood as a nozzle head. Next, the nozzle 11 optionally directly, as in 1 represented, or in the usual way via a spray lance o. The like. To the valve gun 10 or any other suitable valve device, which in particular allows a selective and / or manual opening and closing of the liquid dispensing connected.

1 shows the liquid dispensing and valve assembly 1 in normal production mode. The liquid 4 is via the open valve device or valve gun 10 and connected nozzle 11 continuously and in particular as a jet 12 output.

In the conveying operation, the liquid 4 with a relatively high pressure, which in particular substantially corresponds to said pump pressure, at the outlet 8th output. This outlet pressure is referred to in the conveying operation as working pressure.

In the conveying operation, the valve assembly 1 serve an adjustment and / or limitation of the outlet pressure or working pressure. This will be discussed later.

If the issue of the liquid 4 in particular by closing the valve gun 10 o. The like. Locked prevents the valve assembly 1 that the pump 3 against the closed valve gun 10 works and possibly even a pressure above the working pressure in the pressure line 9 builds. This would be very dangerous at pressures of, for example, 50 MPa or more, and could result in injury especially if the valve gun is accidentally opened 10 to lead. Further, this would lead to a very strong and unwanted recoil each time the valve gun is opened. To avoid this, conducts the valve assembly 1 with closed valve device or valve gun 10 the one from the pump 3 supplied liquid 4 via a bypass from or back again, in particular in the liquid reservoir or at the inlet or inlet of the pump 3 , in particular so that the liquid 4 is preferably conveyed in the circuit with only a small flow resistance. This operation is referred to as bypass operation in the present invention. Accordingly, the valve assembly 1 often referred to as Bypaßventilanordnung or unloader.

The valve arrangement 1 points in the supply line 6 in particular as a check valve 13 trained check valve, which in particular automatically closes or blocks when the liquid flow through the supply line 6 , in particular by closing the valve gun 10 , collapses, so in the subsequent bypass operation. The check valve ensures that the working pressure or outlet pressure is maintained on the outlet side.

The valve arrangement 1 has to implement the bypass in particular a bypass line 14 and an associated bypass valve 15 on. The bypass line 14 branches upstream of the check valve from the supply line 6 so that the already mentioned return from the pump 3 zugeförderten liquid 4 in Bypaßbetrieb and in particular their promotion in the cycle it is possible. For this purpose, the bypass line 14 in the illustrated example, in particular via a return line 16 to the liquid reservoir or the input side of the high-pressure pump 3 connected. Alternatively, the return line 14 but only one derivative of the pump 3 pumped liquid 4 serve in bypass mode, without the derived liquid 4 is conveyed in the bypass operation in the circulation.

The bypass valve 15 is controllable in particular in dependence on the downstream of the check valve pending outlet pressure, as indicated by the dashed line in 1 indicated and explained later in more detail.

In particular, the valve assembly 1 designed such that during the transition from the delivery mode into the bypass mode - ie in particular when closing the valve gun 10 - First, the liquid flow through the supply line 6 or collapses through the check valve and the check valve - in particular automatically due to corresponding spring preload o. The like. - Includes. Next arises when usually abrupt closing the liquid output, in particular the valve gun 10 , a pressure pulse in the pressure line 9 , So a sudden or pulsatile increase of the downstream of the check valve pending pressure or outlet pressure. This pressure increase is preferably used to the bypass valve 15 in particular at least initially open to the valve assembly 1 to switch to the bypass mode or the bypass line 14 release.

Preferably, the valve assembly 1 further a pressure control device 17 with a bypass 18 on, which bridges the check valve and an associated pressure control valve 19 is lockable. The pressure control device 17 or the pressure control valve 19 serves to reduce the outlet pressure in the bypass mode - ie closed check valve - from the working pressure on a contrast preferably significantly reduced holding pressure of in particular at most 5 MPa, more preferably about 3 MPa or less. In bypass mode or with closed valve gun 10 So then only this reduced holding pressure remains in the pressure line 8th obtained, even with an accidental opening of the valve gun 10 leads to no injuries, only a small recoil when opening the valve gun 10 result and does not cause excessive material stress. One aspect of the present invention is that the holding pressure is lowered very significantly in relation to the very high working pressure, in particular to less than 20%, more preferably to less than 15%, preferably to about 10% or less. This allows a relatively high reduction and high reliability in particular fully open bypass valve 15 in bypass mode.

The mentioned holding pressure 8th is preferably used to the bypass valve 15 keep open in bypass mode. Alternatively or additionally, the holding pressure can also be used to the high-pressure cleaning device 2 or their high-pressure pump 3 off.

If the liquid output - especially the valve gun 10 - Reopened, first decreases the outlet-side pressure (holding pressure) significantly from, if necessary, to 0. This pressure drop preferably leads to the fact that the bypass valve 15 - In particular automatically by spring force and / or by the liquid flow or by the fluid pressure in the supply line 6 and / or bypass line 14 - closed again. Alternatively or additionally, said pressure drop can also be evaluated or detected to the high pressure cleaning device 1 or feed pump 3 turn back on, and then the bypass valve 15 is closed again in the episode.

With closed bypass valve 15 leads the promotion of the liquid 4 through the pump 3 to a quasi-immediate increase in pressure in the supply line 6 and corresponding opening of the check valve, so that the promotion of the liquid 4 and output via the pressure line 9 , Valve gun 10 and nozzle 11 starts again, so the delivery operation resumed and the outlet side of the working pressure is reached again.

It should be noted that the supply line 6 in particular as a conduit in the functional sense, ie as a fluidic connection, is to be understood and in particular from several channels, passages, bores o. The like. Can be constructed or formed. The same applies to the bypass line 14 and / or bypass 18 or other fluidic connections, lines o. The like. The valve assembly 1 or the high-pressure cleaning device 2 ,

Hereinafter, first, a preferred construction of the proposed valve arrangement 1 based on 2 to 4 explains the valve assembly 1 each show in a schematic section, and indeed 2 in the production business, 3 at the transition from production mode to bypass mode, and 4 in bypass mode. In addition, reference is also made to the prior art described at the beginning for understanding or with regard to possible implementations.

The illustrated valve assembly 1 has a housing 20 in which preferably all components and components of the valve assembly 1 taken or on which they are preferably arranged.

The check valve is, as already mentioned, preferably as a check valve 13 educated. In the illustrated example, it has a valve body 21 on top of an associated spring 22 in the closing direction against a valve seat against the output or main flow direction through the supply line 6 is biased. In particular, the check valve is in an outlet 8th forming bore of the housing 20 used or installed. Particularly preferably, the check valve or check valve 13 no seal on, but seals directly with its slope of the valve piston directly on the housing.

At the outlet 8th is preferably a connection device, such as a quick coupling, for connecting the pressure line 9 , in particular a hose provided.

The valve arrangement 1 further preferably comprises a first actuating device 23 with an actuator, in particular a control piston 24 , for actuation, in particular for opening a valve or closing body 25 the bypass valve 15 on. The actuator or the control piston 24 is preferably independent or separated from the closing body 25 movable, so preferably not firmly connected to this.

The control piston 24 is in one of the closing body 25 pulled-off rest position preferably biased by spring force, in particular by an associated main spring 26 , Preferably, the biasing force is adjustable, for example by means of a spindle adjustment, a preferably rotatable handle 27o , like.

The adjustment of the biasing force is used to set the maximum Beriebsdrucks the valve assembly 1 , The adjustment is made in particular by turning the handle 27 , Particularly preferred is a backup or a final fixing by a lock nut, clamping screw o. The like. Possible, as indicated in the drawing.

Between the main spring 26 and the control piston 24 a shim may be provided in particular to compensate for lateral forces in the pressure adjustment.

Preferably, the switching piston extends 24 through an operating room 28 and sealed in an adjacent bypass room 29 with the bypass valve open 15 fluidic with the supply line 6 communicates and to the preferably transversely to the supply line 6 extending bypass line 16 belongs or forms these.

The operating room 28 is via a control channel 30 with the supply line 6 connected downstream of the check valve, so that the outlet pressure to a in the operating room 28 from the control piston 24 formed piston area 31 act and thereby the switching piston 24 in the direction of the bypass valve 15 or closing body 25 against the force of the mainspring 26 can pretension or move.

The bypass valve 15 has, as already mentioned, the movable closing body 25 and an associated valve seat 32 on, in particular at the transition from the supply line 6 to the bypass room 29 or at any other suitable section of the bypass line 14 is formed or arranged.

The bypass valve 15 is in particular in a bore or opening of the housing 20 used or installed, in particular transversely to the rectilinear preferably before through the housing 20 extending supply line 6 runs and / or upstream of the check valve is arranged.

Particularly preferred is the bypass valve 15 designed such that in the supply line 6 Fluid pressure prevailing upstream of the check valve is the bypass valve 15 or its closing body 25 in its closed position or position against the valve seat 32 pushes or pretensions.

The bypass valve 15 preferably has a closing body 25 associated closing spring 33 on that the closing body 25 in the closed position against the associated valve seat 32 biases.

The bypass valve 15 or closing body 25 is preferably a guiding or adjusting means, more preferably a counter rod 34 , assigned, the or preferably fixed to the closing body 25 connected is. In the illustration example, the closing spring surrounds 33 the counter rod 34 peripheral and is for example on a housing part 35 relocated, preferably releasably on the housing 20 is attached. The guide means, like the counter rod 34 Preferably, it extends from the pressurized bypass valve 15 or the pressurized supply line 6 out into the ambient pressure outside area, preferably sealed by the housing 20 or its housing part 35 o. The like. Through. The counter rod 34 Thus, it operates preferably against the ambient pressure, so that, depending on their diameter (through the housing 20 or housing part 35 in the outer space) a partial compensation of the shooting body 25 by the fluid pressure force or a corresponding reduction of the resulting, relevant to the closing force surface (area of the effective sealing seat of the bypass valve 15 minus cross section of the counter rod 34 ) he follows.

The valve arrangement 1 in the illustrated example, preferably has an optional second actuator 36 on, in particular on the guiding or adjusting means, in particular the counter rod 34 or in any other suitable manner on the closing body 25 directly or indirectly attacks.

The second actuator 36 preferably takes over a deflection and / or translation 37 at the bypass valve 15 or its closing body 25 , especially on the counter rod 34 , at. Preferably, this is an inclined plane, in the illustrated example, in particular by a cone 38 o. The like., At the counter rod 34 formed or attached. Particularly preferred is the cone 38 o. The like. For calibration longitudinally adjustable.

The second actuator 36 further preferably comprises a holding piece 39 on, in particular, independent of and / or transverse to the counter rod 34 is adjustable and on the inclined plane or the cone 38 , the or the according to the direction of movement or axis of the counter rod 34 is inclined, attacks or slides along, in particular around the counter rod 34 and thus the closing body 25 in the from the valve seat 32 off position (open position) to block or hold against re-closing. Particularly preferred is the inclined plane or the cone 38 made of plastic, preferably PEEK, and / or in particular of a cap of the holding piece 39 , educated. However, here are other gear connections, constructive solutions o. The like. Possible.

Preferably, the actuating direction of the second actuating device extends 36 or the holding piece 39 transverse to the direction of movement of the closing body 25 or the counter rod 34 , This allows a compact construction and / or facilitates the preferred at least partial decoupling of the movements or non-fixed connection of the parts.

The outside, especially outside the case 20 Guided actuating means (counter rod 34 ) allows a simple external cultivation of preferably only optionally provided second actuator 36 ,

The second actuator 36 is in the illustrated example - in particular for (extensive) decoupling from working and / or holding pressure - designed such that the holding piece 34 preferably only with defined, in particular by a biasing spring 40 and a delimiter 41a predetermined preload values on the closing body 25 directly or - as here - via the redirection or translation 37 acting indirectly or can be released axially.

The biasing spring 40 in particular acts between the holding piece 39 and a pressure piston 41 the second actuator 36 , The pressure piston 41 is from a rest position, not shown, initially up to a stop in the direction of the holding piece 39 displaceable, so that the biasing spring 40 from a first bias value to a second bias value. The first bias value is by the limiting element 41a , in particular a spacer rod, fixed. The boundary element 41a limits the maximum distance of the pressure piston 41 from the holding piece 39 , so that in this installed state, the biasing spring 40 already biased to the first bias value. In the rest position of the pressure piston 41 However, preferably no force is applied to the closing body 25 or the bypass valve 15 , especially the translation 37 or the cone 38 , exercised.

The boundary element 41a allows the displacement of the pressure piston 41 relative to the holding piece 39 , causing the bias of the biasing spring 40 is increased to the second bias value. Thus, then the holding piece 39 with the force corresponding to the second bias value against the cone 38 pretensioned during conveying operation.

The displacement of the pressure piston 41 is limited by a housing-side stop or the like. Accordingly, the second bias value is the same as the first bias value of the pressure piston 41 Acting pressure basically independent.

The displacement of the pressure piston 41 is preferably carried out in dependence on the outlet pressure. For this purpose is a pressure piston 41 assigned control room 43 fluidically via a preferably formed from a plurality of holes or channels line 44 to the supply line 6 connected downstream of the shut-off valve.

The second actuator 36 is preferably operable or controllable by the outlet pressure. At high fluid pressure, in particular the working pressure, the pressure piston 41 to the holding piece 39 shifted so that the biasing spring 40 or the holding piece 39 with the second bias value against the cone 38 is tense.

The pressure piston 41 is preferably of a counter spring 42 biased into its rest position. This counter spring 42 preferably causes a lower restoring force than the biasing spring 40 , Even with low holding pressure of the pressure piston remains in the holding piece 39 shifted position.

With fully open bypass valve 15 can the holding piece 39 in the cone 38 or enter the inclined plane formed thereby, so from the plunger 41 remove again. Accordingly, here by the only between the pressure piston 41 and the holding piece 39 acting biasing spring 40 relaxed again to the first bias value. The holding piece 39 holds the bypass valve 15 then with the first bias value in the open position, so only with the first bias value against the cone 38 biased.

The axial movement of the retaining piece 39 and / or pressure piston 41 is preferably limited in each case by axial stops.

The pressure control device 17 is preferably the same as the second actuator 36 only optional provided and in particular outside of the housing 20 or on the valve assembly 1 mountable.

Particularly preferably, the second actuating device is provided 36 and / or the pressure control device 17 as an assembly on the valve assembly 1 to install and / or modular form and in particular to provide this with its own, possibly combined housing.

The pressure control device 17 or the pressure control valve 19 preferably has a valve piston 45 with an associated valve spring 46 that the valve piston 45 with a certain force in its closed position biases against a valve seat on.

The pressure control valve 19 is inlet side to the supply line 6 downstream of the check valve directly or preferably also via the line 44 connected, so that this part of the bypass line 18 forms. Downstream of the pressure control valve 19 leads the bypass line 18 then to the supply line 6 upstream of the check valve, in particular in the area of the bypass valve 15 ,

At a higher pressure downstream of the check valve than upstream and when passing through the valve spring 46 given force (pressure difference) opens the pressure control valve 19 and leaves liquid 4 over the bypass 18 until the pressure difference is reached or fallen below again. Accordingly, therefore, at the beginning of the bypass operation, the lowering of the discharge pressure from the working pressure to the holding pressure at the outlet 8th the supply line 6 and thus also in the pressure line 9 , In the reverse direction, the pressure control valve locks 19 ,

The pressure control device 17 preferably has a throttle formed in particular by a thin bore 47 on, the speed of the pressure reduction from the working pressure to the holding pressure at the transition from the delivery mode to the bypass mode and thus in particular the return speed of the control piston 24 to limit it to its rest position and preferably keep it low. The throttle 47 is preferably downstream of the pressure control valve 19 in the bypass 18 arranged.

2 shows the valve assembly 1 in production mode. The liquid 4 flows through the supply line 6 and is at the working pressure (for example 30 to 50 MPa) at the outlet 8th to the pressure line 9 delivered and over the valve gun 10 and nozzle 11 as a ray 12 output. The check valve is by the liquid flow against the force of the spring 22 open.

The working pressure exerts in the operating room 28 a force on the piston section 31 out, so that the force of the main spring 26 overcome and the first actuating device 23 or their control piston 24 in the opening direction against the closing body 25 is advanced or is. However, the bypass valve remains 15 in the conveying mode (normally) closed, the closing body 25 is not (yet) from his valve seat 32 lifted. In particular, provide the on the closing body 25 in the supply line 6 acting fluid pressure and the closing spring 33 , which act in the closing direction, ensure that the bypass valve 15 in production mode (normally) remains closed.

However, when the discharge pressure becomes too high (excessively increased), the first actuator applies 23 especially with their control piston 24 a correspondingly higher force on the closing body 25 on, so that the bypass valve 15 is opened and the bypass valve 15 in this case can act as an overload valve or safety valve to limit the pressure.

In delivery mode, it has on the pressure piston 41 over the line 44 acting working pressure the pressure piston 41 in 2 to the left, so to the holding piece 39 shifted so that the holding piece 39 with the higher second bias value against the cone 38 is biased. However, this biasing force is still lower than that on the closing body 25 acting in the conveying operation closing force, so that the bypass valve 15 remains closed.

Next is in the delivery mode, the pressure control valve 19 due to the force of its valve spring 46 closed.

If the liquid output in particular by closing the valve gun 10 is locked, there is a transition or switching from the conveyor mode in the bypass mode, as in 3 shown.

First, the liquid flow breaks through the check valve so that it closes. The blocking of the liquid dispensing or the closing of the valve gun 10 o. The like. Further leads to a pressure pulse (short-term sudden increase in the outlet pressure), so that now the first actuator 23 by means of the previously on the closing body 25 adjacent control piston 24 the bypass valve 15 opens very quickly and / or at least initially, which until then in the bypass valve 15 on the side of the supply line 6 prevailing fluid pressure drops very quickly and this to an easier further opening of the bypass valve 15 leads.

With the opening movement of the closing body 25 goes a corresponding axial movement of the counter rod 34 or the cone 38 accompanied, so that the holding piece 39 laterally to the counter rod 34 advance or into the cone 38 or the inclined plane formed therefrom can continue to retract to the closing body 25 with the preferably fixed, in particular axially adjustable cones connected thereto 38 to keep in the preferably fully open position, as in 3 indicated.

If necessary, causes the first actuator 23 So only the initial, but preferably complete opening of the bypass valve 15 at the transition to the bypass operation. The second actuator 36 then ensures that the bypass valve 15 during the course of the bypass operation - ie during and after the lowering of the outlet pressure from the working pressure to the holding pressure - is kept open.

The pressure control device 17 or their pressure control valve 19 opens and causes the said lowering of the outlet pressure. However, this is preferably done - in particular due to the throttle 47 - Relatively slow and / or controlled, so that the actuated by the outlet pressure control piston 24 correspondingly slow or controlled by the in 3 still advanced position in his in 4 returns shown rest position. This is a hard on or breaking the control piston 24 especially with the high-acting forces avoided. 4 shows the valve assembly 1 in bypass mode.

Next, the only slow pressure drop from the working pressure to the holding pressure that allows the first actuator 23 the bypass valve 25 initially completely opens.

Even when lowering the pressure from the working pressure to the holding pressure, the pressure piston remains 41 in the to the holding piece 39 or cone 38 advanced position. The power of the opposing spring 42 is therefore preferably lower and can the pressure piston 41 do not move back to its rest position. Consequently, the holding piece remains in the bypass mode 39 with the lower first bias value against the cone 38 biased. This biasing force is sufficient to bypass the closing body 25 against the force of the closing spring 33 from the holding piece 39 to hold in the open position.

Only when the valve gun 10 is opened again, breaks the outlet pressure or holding pressure together. This causes the second actuator 36 or their pressure piston 41 no preload force on the holding piece 39 and accordingly no force on the cone 38 exerts, so that the closing body 25 due to the force of the closing spring 33 returns to its closed position, the bypass valve 15 so close. The valve device 1 then returns to the in 2 shown state of the conveying operation back.

The valve arrangement 1 is especially designed for very high volume flows of, for example, 30 to 60 l / min. This allows universal use for different purposes or with closed pumps 3 or high-pressure cleaning devices 2 ,

At higher volume flows is a larger diameter of the closing body 25 and the associated valve seat 32 or the sealing seat required, in particular in order to achieve a sufficiently low flow resistance in the bypass operation, in particular at the same opening stroke. Correspondingly, however, the area of the closing body which acts in the closing direction then increases 25 , This normally requires a substantial increase in the oppositely effective area of the piston portion 31 or the first actuating device 23 and / or in particular a much greater dimensioning of the main spring 26 and all related components to withstand the much higher forces.

The present invention now goes another way. By means of working against ambient pressure counter rod 34 there is compensation.

By increasing the diameter of the counter rod 34 it is namely possible with an enlarged sealing seat of the bypass valve 15 to compensate for the increase in area, so that the resulting, effective in the closing direction surface preferably remains constant or substantially equal. A cross-sectional increase at the sealing seat is thus characterized by a corresponding increase in the area of the diameter of the counter rod 34 reached. Accordingly, then a change of the other components, in particular the first actuating device 23 , not necessary anymore. Consequently, with very little effort and using a plurality of common parts, a family of valve assemblies 1 be created for different flow rates and / or working pressures.

The valve arrangement 1 preferably has a sensor, here a microswitch 48 , for detecting the position of the bypass valve 15 , in particular the opening and closing of the bypass valve 15 , on. In the illustration example, the position of the counter rod 34 detected. In particular, the counter rod with its free end actuates the associated microswitch 48 ,

The valve arrangement 1 preferably has a sensor for detecting the position or position of the switching piston 24 on. Preferably, this is a micro switch 49 used, for example, via an actuator 50 from the control piston 24 is operable. However, other constructive solutions are possible.

The preferred detection of the position of the bypass valve 15 and / or the switching piston 24 allows optimal control of the high pressure washer 2 , in particular the pump 3 and / or other components.

The valve arrangement 1 is particularly preferably designed for working pressures of about 35 to 70 MPa. In bypass mode - ie with the spray gun or valve gun closed - the pressure in the hose or in the pressure line is reduced 9 and in the gun 10 for example, at most 5 MPa.

1

valve assembly

2

High-pressure cleaning device

3

pump

4

liquid

5

tank

6

supply line

7

Inlet

8th

outlet

9

pressure line

10

valve gun

11

jet

12

beam

13

check valve

 14

bypass line

15

bypass valve

16

return

17

Pressure control device

18

bypass line

 19

Pressure control valve

20

casing

21

valve body

22

feather

23

first actuator

24

switching piston

25

closing body

26

mainspring

27

handle

28

operating space

 29

Bypaßraum

30

control channel

31

piston section

32

valve seat

33

closing spring

34

counter-link

35

housing part

36

second actuator

37

Translation / redirection

38

cone

39

holding piece

40

biasing spring

41

pressure piston

41a

limiting element

42

against spring

43

control room

44

management

45

plunger

46

valve spring

47

throttle

48

microswitch

49

microswitch

50

actuator

Claims (18)

Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, in particular by a high-pressure cleaning device ( 2 ) or pump ( 3 ), can be supplied and optionally operated in a conveying or bypass operation ,, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed shut-off valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) for blocking the bypass line ( 14 ) in the conveying operation, preferably with a first actuating device ( 23 ) for the particular complete opening of the bypass valve ( 15 ) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line is exceeded ( 6 ) in the conveying operation, preferably with a second actuating device ( 36 ) to keep open the bypass valve ( 15 ) in the bypass operation, preferably with a pressure control device ( 17 ) for lowering the outlet pressure to a reduced pressure compared to the working pressure in the bypass mode, characterized in that the second actuating device ( 36 ) and / or the pressure control device ( 17 ) as an assembly on the valve assembly ( 1 ) is preferably attachable to the outside and / or designed in a modular manner or are. Valve arrangement according to Claim 1, characterized in that the second actuating device ( 36 ) and / or the pressure control device ( 17 ) is provided with its own, possibly combined housing or are. Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, in particular by a high-pressure cleaning device ( 2 ) or pump ( 3 ), and is optionally operable in a conveying or bypass operation, in particular according to one of the preceding claims, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed shut-off valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) in particular with a closing body ( 25 ) for blocking the bypass line ( 14 ) in the conveying operation, preferably with a first actuating device ( 23 ) for the particular complete opening of the bypass valve ( 15 ) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line is exceeded ( 6 ) in the conveying operation, with a second actuating device ( 36 ) to keep open the bypass valve ( 15 ) in the bypass operation, preferably with a pressure control device ( 17 ) for lowering the outlet pressure to a reduced pressure compared to the working pressure in the bypass mode, characterized in that the second actuating device ( 36 ) of the movement and / or direction of movement of the bypass valve ( 15 ) or closing body ( 25 ) is decoupled. Valve arrangement according to claim 3, characterized in that the second actuating device ( 36 ) transverse to the movement and / or direction of movement of the bypass valve ( 15 ) or closing body ( 25 ) has extending actuating direction. Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, in particular by a high-pressure cleaning device ( 2 ) or pump ( 3 ), and is optionally operable in a conveying or bypass operation, in particular according to one of the preceding claims, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed shut-off valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) in particular with a closing body ( 25 ) for blocking the bypass line ( 14 ) in the conveying operation, preferably with a first actuating device ( 23 ) for the particular complete opening of the bypass valve ( 15 ) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line is exceeded ( 6 ) in the conveying operation, with a second actuating device ( 36 ) to keep open the bypass valve ( 15 ) in the bypass operation, preferably with a pressure control device ( 17 ) for lowering the outlet pressure to a reduced pressure compared to the working pressure in the bypass mode, characterized in that the second actuating device ( 36 ) via a preferably mechanical transmission directly or indirectly at the bypass valve ( 15 ) or closing body ( 25 ) attacks. Valve arrangement according to claim 5, characterized in that the second actuating device ( 36 ) a diversion and / or translation ( 37 ), in particular an inclined plane or a cone ( 38 ), as a transmission for actuating or blocking the bypass valve ( 15 ) or closing body ( 25 ) having. Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, in particular by a high-pressure cleaning device ( 2 ) or pump ( 3 ), and is optionally operable in a conveying or bypass operation, in particular according to one of the preceding claims, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed check valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) in particular with a closing body ( 25 ) for blocking the bypass line ( 14 ) in the conveying operation, preferably with a first actuating device ( 23 ) for the particular complete opening of the bypass valve ( 15 ) at the transition from Förderbe operation in the bypass operation and / or when exceeding a maximum outlet pressure of the supply line ( 6 ) in the conveying operation, with a second actuating device ( 36 ) to keep open the bypass valve ( 15 ) in the bypass operation, preferably with a pressure control device ( 17 ) for lowering the outlet pressure to a reduced pressure compared to the working pressure in the bypass mode, characterized in that the second actuating device ( 36 ) is controllable by the outlet pressure, but with a decoupled from the outlet pressure operating force on the bypass valve ( 15 ) or the closing body ( 25 ) or an associated actuating means acts. Valve arrangement according to claim 7, characterized in that the actuating force at the holding pressure to a first bias value of a biasing spring ( 41 ) and the working pressure to a second bias value of the biasing spring ( 41 ) corresponds. Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, in particular by a high-pressure cleaning device ( 2 ) or pump ( 3 ), and is optionally operable in a conveying or bypass operation, in particular according to one of the preceding claims, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed shut-off valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) for blocking the bypass line ( 14 ) in the conveying operation, preferably with a first actuating device ( 23 ) for in particular completely opening the bypass valve ( 15 ) during the transition from the conveying mode to the bypass mode and / or when a maximum outlet pressure of the supply line is exceeded ( 6 ) in the conveying mode, with a pressure control device ( 17 ) for lowering the discharge pressure to a reduced pressure compared to the working pressure in the bypass operation, characterized in that the pressure control device ( 17 ) with a throttle ( 47 ) and / or is designed such that the outlet pressure is lowered to the holding pressure at a maximum speed or controlled or throttled. Valve arrangement according to claim 9, characterized in that the valve arrangement ( 1 ) is designed such that the first actuating device ( 23 ), preferably the switching piston ( 24 ), is moved back in response to the pressure reduction to the holding pressure or controlled in its rest position. Valve arrangement according to claim 9 or 10, characterized in that the valve arrangement ( 1 ) a second actuator ( 36 ) to keep open the bypass valve ( 15 ) in bypass operation, in particular at and / or by the holding pressure has. Valve arrangement according to one of the preceding claims, characterized in that the bypass valve ( 15 ) or its closing body ( 25 ) of a closing spring ( 33 ) and / or the fluid pressure in the supply line ( 6 ) is biased or pressed upstream of the check valve in the closed position. Valve arrangement according to one of the preceding claims, characterized in that the first actuating device ( 23 ) against spring force in the opening direction is actuated and / or a control piston ( 24 ) connected to the supply line ( 6 ) is in fluid communication in such a way that it can be moved from the working pressure of one of the closing body ( 25 ) of the bypass valve ( 15 ) withdrawn rest position against the closing body ( 25 ) is moved or biased in the opening direction. Valve arrangement according to claim 13, characterized in that the actuating piston ( 24 ) by means of a main spring ( 26 ) is biased in the rest position, so that the control piston ( 24 ) is moved back on lowering the discharge pressure to the holding pressure in its rest position. Valve arrangement ( 1 ), which are filled with a liquid ( 4 ) under high pressure, especially one High pressure cleaning device ( 2 ) or pump ( 3 ), and is optionally operable in a conveying or bypass operation, in particular according to one of the preceding claims, with a supply line ( 6 ), the inlet side of the liquid ( 4 ), whereby the liquid ( 4 ) in the conveying operation outlet side with a working pressure, in particular via a connectable pressure line ( 9 ) or valve device, such as a valve gun ( 10 ), can be dispensed, with a particular as a check valve ( 13 ) formed shut-off valve in the supply line ( 6 ), which in the conveying operation of the liquid ( 4 ) is flowed through and closes in bypass mode, with a bypass line ( 14 ) upstream of the check valve to the supply line ( 6 ) is connected to the liquid ( 4 ) in the bypass operation, in particular to the high-pressure cleaning device ( 2 ), the pump ( 3 ) or a liquid reservoir, with a bypass valve ( 15 ) in particular with a closing body ( 25 ) for blocking the bypass line ( 14 ) in the conveying operation, wherein the bypass valve ( 15 ) or its closing body ( 25 ) is biased or pressed by the fluid pressure in the closed position, with an actuating device ( 23 . 36 ) for preferably completely opening the bypass valve ( 15 ) in the bypass mode and / or when a maximum outlet pressure of the supply line ( 6 ) in the conveying operation, characterized in that the valve arrangement ( 1 ) one with the closing body ( 25 ) coupled counter rod ( 34 ), which is sealed from the pressurized by-pressure bypass valve ( 15 ) for at least partial compensation by the fluid pressure on the closing body ( 25 ) Acting closing force extends into a standing under ambient pressure outside area. High pressure cleaning device ( 2 ) with a valve arrangement ( 1 ) according to any one of the preceding claims. High-pressure cleaning device according to claim 16, characterized in that a pressure line ( 9 ), in particular a hose, with a valve gun ( 10 ) to the valve assembly ( 1 ), in particular their outlet ( 8th ) connected. Use of a sealed valve made of a fluid pressure valve ( 15 ) for at least partial compensation by the fluid pressure on a closing body ( 25 ) of the valve ( 15 ) acting closing force out into a standing under ambient pressure outside area extending counter rod ( 34 ), so that at a certain fluid pressure a certain closing force on the closing body ( 25 ) acts, in particular in a valve arrangement ( 1 ) according to one of claims 1 to 15, wherein, depending on a desired volume flow through the valve ( 15 ) the diameter of a valve seat ( 32 ) of the valve ( 15 ) and / or the diameter of the closing body ( 25 ) and the diameter of the counter rod ( 34 ) is varied to adjust the compensation, so that the closing force at the particular fluid pressure or the resulting, effective in the closing direction surface remains at least substantially the same.