RU2821688C1 - Shutoff valve - Google Patents

Abstract

FIELD: valve industry.

SUBSTANCE: invention relates to valve industry, in particular to disconnecting devices with a rotary shut-off element, and is intended for automatic shutoff of high-pressure pipeline in case of emergency decrease or increase of pressure in it. Cutoff valve stem has a cylindrical protrusion at the end, the retainer is made in the form of a rotary latch pressed to the cylindrical protrusion of the stem by a torsion spring, has, on the side of the cylindrical protrusion of the rod, a cavity in the form of a truncated pyramid and an angularly skewed retainer stop made with possibility of engagement with bevelled at angle support of plate at installation of plate in working position and its fixation in this position at pressure in valve housing within set operating range and disengagement with the plate thrust and return of the plate to the closed position when the pressure in the valve housing goes beyond the set operating range.

EFFECT: valve drive design provides the possibility of the plate installation into the working position and its reliable fixation in this position at pressure in the valve housing within the adjusted operating range without the presence of a mode switching handle in the drive with a minimum number of manipulations when starting the valve into operation and adjustment, as well as reliable operation and return of the plate to the closed position when the pressure in the valve housing goes beyond the set operating range.

1 cl, 4 dwg

Description

The present invention relates to valve engineering, in particular to shut-off devices with a rotary shut-off element, and is intended for installation in wells of oil and gas condensate fields to automatically shut off a high-pressure pipeline in the event of an emergency decrease or increase in pressure in it.

A known shut-off valve (RF Patent No. 2476746, IPC: F16K 17/04, F16K 15/03, publ. 02/27/2013), containing a housing with a passage channel and connecting flanges, a seat, a rotary shut-off element in the form of a valve located in the housing in close proximity to the seat and interacting with the mechanism of the pressure reduction and/or pressure release device located on the body. The specified mechanism contains a housing with a nut. The nut with its supporting inner surface interacts through a thrust bearing with one supporting surface of the high-pressure spring, and the other supporting surface with the supporting surface of the sleeve. The sleeve is made with the possibility of axial movement and is installed inside the said housing. A sleeve is installed inside the said sleeve with the possibility of axial movement. The bushing interacts with the supporting surface of the low pressure spring mounted on the rod. The rod is located inside the said sleeve and is capable of axial movement. The other supporting surface of the sleeve interacts with the supporting surface of the rod. The device for fixing the damper in the open position is made in the form of a cylinder. The cylinder is made with the possibility of axial movement in the tip of the said rod. Spring-loaded balls are located in the walls of the cylinder with the possibility of radial movement. A cylinder is installed on the outer surface of the damper. The cylinder has at least one annular profiled groove.

In the embodiment, on the outer surface of the housing of the triggering device there is a scale for determining the pressure force of the high-pressure spring, and on the outer surface of the sleeve installed in the sleeve there is a scale for determining the force of the low-pressure spring.

The main disadvantages of this valve are the significant complexity of the design of the damper fixation device, low reliability of operation due to the complexity of the design, as well as low maintainability due to the fact that the seat is not removable and is made integral with the outlet flange. There is also no rod position indicator in the design of the valve actuation mechanism, and the spring preload determination scales indicate the spring preload force, and not the response pressure of the sensing element, which requires recalculating the spring preload force into pressure when setting the valve to certain pressure limits. When fine-tuning the response pressure, it is not possible to set the scales to the actual response pressure due to their immobility.

A shut-off device is known (RF patent No. 2313714, IPC: F16K 17/04, F16K 39/04, publ. 12/27/2007), containing a housing, a rotary shut-off element located in it, holding the shut-off element in the open position, a latch with stops and a sensing element , made in the form of a rod loaded with springs, wherein the rod of the sensing element is connected to a latch, and the latch with stops holds the locking element in the open position. The locking element is brought to the horizontal (open) position using a handle. To equalize the pressure before and after the rotary shut-off element before opening it, a valve is installed on the body. The response limits of the sensitive element from a decrease and increase in pressure from the permissible are set by caps.

The main disadvantages of this valve are low maintainability due to the fact that the seat is not removable and is made integral with the outlet flange, as well as the absence of a rod position indicator and response pressure scales of the sensing element in the design of the valve actuation mechanism.

A shut-off valve is also known (RF patent No. 2794685, IPC: F16K 15/03, F16K 17/10, publ. 04/24/2023, prototype), containing a body, inlet and outlet flanges, a seat, a rotary shut-off element located in the body, interacting with a drive for a pressure release device located on the housing, a locking element with stops holding the shut-off element in the open position, and a sensing element made in the form of a spring-loaded rod connected to a latch holding the shut-off element in the open position with stops. the organ is made in the form of a plate, the seat is removable and installed in the bore of the output flange, sealed with a rubber ring and fixed in the axial direction by a plate mounting bracket and a strip, the actuation device drive is spring-loaded and equipped with a position indicator of the sensing element rod, with the ability to visually monitor the position of the rod , and movable scales of the response pressure of the sensitive element, with the ability to set the actual response pressure of the sensitive element on the scales when setting up.

The main disadvantages of this valve are the complex design of the spring drive, associated with the presence of a mode switching handle on the drive, and, as a consequence, the complexity of putting the valve into operation and setting it up, which involves a large number of manipulations.

To install the disc in the operating position (OPEN), fix it in this position and put the valve into operation, you must:

- shut off the supply of the working medium using the fittings located upstream of the valve;

- open the bypass valve and equalize the pressure before and after the plate;

- set the drive handle to the MANUAL position, while the drive lock rotates and frees up space for the plate stop to pass when it is raised to the working position;

- pull back and turn the handle of the plate lifting mechanism to the STOP position;

- move the drive handle to the STOP position, while the latch returns to its original position and engages with the plate stop, holding the plate in the working position;

- move the handle of the plate lifting mechanism to the AUT position;

- close the bypass valve;

- resume the supply of the working medium;

- move the drive handle to the AVT position.

The objective of this invention is to create a shut-off valve with a drive that is relatively simple in design, with a minimum amount of manipulation when putting the valve into operation and adjustment.

This task is achieved by the fact that in a shut-off valve containing a body, inlet and outlet flanges, a removable seat installed in the bore of the outlet flange, sealed with a rubber ring and fixed in the axial direction, a rotary shut-off element made in the form of a plate with a stop, located on housing, a drive of the actuation device with a sensing element made in the form of a rod loaded with springs, connected to a latch that holds the stop in the open position, a shut-off element equipped with an indicator of the position of the sensing element rod, with the ability to visually monitor the position of the rod, and movable scales of the actuation pressure of the sensing element, with the possibility of setting the actual response pressure of the sensing element on the scales during adjustment, according to the invention, the rod has a cylindrical protrusion at the end, the latch is made in the form of a rotary latch, pressed against the cylindrical protrusion of the rod by a torsion spring, has a depression in the shape of a truncated pyramid on the side of the cylindrical protrusion of the rod, and, an angled retainer stop configured to engage with the angled poppet stop when the poppet is installed in the operating position and fix it in this position when the pressure in the valve body is within the configured operating range and disengages from the poppet stop and returning the disc to the closed position when the pressure in the valve body goes beyond the configured operating range.

The essence of the invention is illustrated by drawings, where in Fig. Figure 1 shows the main view of the proposed valve in the operating position with the location of the shut-off valve plate, the drive retainer, the bypass valve, the seat mounting in the bore of the output flange, the rod position indicator and the response pressure scale when the pressure rises; Fig. 2 is a section A-A with the location the shut-off element, the seat mounting plate, the mechanism for lifting the shut-off body plate, the stop of the plate, the valve actuation drive (mechanism) and the response pressure scale when the pressure decreases, in Fig. 3 - section B-B with the location of the shut-off body plate and its fastening to the outlet flange, the plate stop, in Fig. 4 - callout B with the location of the rod and lock when triggered during an emergency increase/decrease in pressure in the valve body: 4a - operating position, 4b - increase in pressure, 4c - decrease in pressure.

In the figures the positions are indicated:

1 - valve,

2 - mechanical drive, configured to operate when the pressure in the valve body increases or decreases,

3 - eye bolts,

4 - body,

5 - inlet flange,

6 - output flange,

7 - plate axis,

8 - plate mounting bracket,

9 - plate,

10 - bypass valve,

11 - plate lifting mechanism,

12 - handle of the plate lifting mechanism,

13 - scale for adjusting the actuation of the drive during an emergency increase in pressure,

14 - scale for adjusting the actuation of the drive during an emergency drop in pressure,

15 - rod position indicator,

16, 17, 18 - rubber sealing rings,

19 - hairpin,

20, 21 - nuts,

22 - clamp axis,

23 - torsion spring of the clamp,

24 - drive lock,

25 - stop of the clamp,

26 - retainer cavity,

27, 28 - rubber sealing rings,

29 - hairpin,

30 - bushing,

31 - screw,

32 - nut,

33 - compression spring for setting the response when the pressure increases,

34 - compression spring for setting the response when the pressure drops,

35 - rod,

36 - rod protrusion,

37 - cap,

38 - plate stop,

39 - saddle,

40 - seat sealing ring,

41 - saddle fastening bar.

The device and its operation

The valve design is shown in Fig. 1-3.

The valve consists of: valve 1; spring actuator 2, with automatic operation to CLOSE when the valve reaches the response pressure value set by the actuator settings, when the pressure of the working medium increases or decreases.

The actuator (Fig. 2) is configured to operate in the event of an emergency increase in pressure in the housing by achieving a certain compression force on the spring 33 by the nut 32.

The actuator is configured to operate in the event of an emergency decrease in pressure in the housing by achieving a certain compression force of the spring 34 by screw 31. The protection of the actuator from the influence of the external environment and violation of the setting ranges is provided by the cap 37.

For installation and dismantling of the valve on the pipeline, eye bolts 3 are provided (Fig. 1).

Valve 1 (Fig. 1) includes: body 4, inlet 5 and outlet 6 flanges, which are attached to body 4 using studs 19 and nuts 20, a removable seat 39 installed in the bore of the output flange, sealed with a rubber ring 40 and fixed in the axial direction with the plate mounting bracket 8 and strip 41.

On the axis 7 of the bracket 8, installed on the outlet flange 6, there is a plate 9, designed to completely block the flow of the working medium when the valve is activated to CLOSE when the pressure of the working medium increases or decreases above or below the values set by the settings of the drive 2.

To equalize the pressure of the working medium before and after plate 9, a bypass valve 10 is installed on the outlet flange 6 (Fig. 1).

To install the plate 9 in the working position (OPEN), a mechanism for lifting the plate 11 with a handle 12 is installed on the body 4.

The plate lifting mechanism is installed in the side hole of the housing 4 and is fixedly attached to the housing with studs 29 and nuts 21.

The tightness of the flow of the working medium in relation to the environment is ensured by rubber sealing rings 16, 17, 18, 27, 28.

Valve operation.

The principle of operation of the valve is the mechanical unlocking of plate 9 by drive 2 when the pressure of the working medium in the pipeline goes beyond the range specified by the valve settings.

When the valve is ready to operate, the handle of the plate lifting mechanism 12 should be in the AVT position. When the handle is in the STOP position. valve operation is not possible.

Setup and commissioning.

At the factory, the valve drive is set to the response pressure values specified in the data sheet.

After installing the valve on the pipeline, check the operation of the valve in accordance with the factory settings specified in the passport.

Perform the check in the following sequence:

- supply the working medium to the section of the pipeline with the valve and provide it with a working pressure equal to the average value between the response pressure for increasing and decreasing specified in the passport, while the protrusion of the rod 36 will be in the middle of the cavity of the clamp 26, and the indicator 15 of the rod 35 will be in position P (Fig. 4a, working position);

- shut off the section of the pipeline with the valve installed in it;

- open bypass valve 10 and equalize the pressure before and after the plate;

- check the position of rod 35 using indicator 15. The indicator should be in position P;

- pull back and turn the handle of the plate lifting mechanism 12 to the STOP position. In this case, the stop of the plate 38 will press the spring-loaded lock of the drive 24 to the side and engage with the stop of the lock 25, ensuring the fixation of the plate 9 in the open position;

- move the handle of the plate lifting mechanism 12 to the AUT position;

- close bypass valve 10;

- reduce the pressure in the pipeline to the value at which the valve should operate when the pressure decreases, while the rod 35, under the influence of the spring 34, will move down into the drive cavity with decreasing pressure, the protrusion of the rod 36 will come out of the cavity of the lock 26, and turn the drive lock 24 to axis 22, the stop of the latch 25 will disengage with the stop of the plate 38, releasing the plate 9, which, under the influence of its own weight and the flow of the medium, will rotate on the axis 7 and press against the seat 39, blocking the flow of the working fluid. The rod position indicator 15 should be in the ZN position (Fig. 4c, when the pressure decreases);

- record the actual response pressure and its correspondence to the pressure specified in the passport. If the response pressure does not correspond to that specified in the passport, bring the position of scale 14 into line;

- resume the supply of the working medium to the section of the pipeline with the valve and provide it with a working pressure equal to the average value between the response pressure for increasing and decreasing specified in the passport;

- shut off the section of the pipeline with the valve installed in it;

- open the bypass valve and equalize the pressure before and after plate 10;

- check the position of rod 35 using indicator 15. The indicator should be in position P;

- pull back and turn the handle of the plate lifting mechanism 12 to the STOP position. In this case, the stop of the plate 38 will press the spring-loaded lock of the drive 24 to the side and engage with the stop of the lock 25, ensuring the fixation of the plate 9 in the open position;

- move the handle of the plate lifting mechanism 12 to the AUT position;

- close bypass valve 10;

- increase the pressure in the pipeline to the value at which the valve should operate when the pressure increases, while the rod 35, under the influence of increased pressure, overcoming the force of the spring 33, will move upward into the actuator cavity with atmospheric pressure, the protrusion of the rod 36 will come out of the cavity of the retainer 26 , will turn the drive latch 24 on the axis 22, the stop of the latch 25 will disengage with the stop of the plate 38, releasing the plate 9, which, under the influence of its own weight and the flow of the medium, will rotate on the axis 7 and press against the seat 39, blocking the flow of the working medium. The position indicator of the rod 15 should be in the SV position (Fig. 4b, with increasing pressure);

- record the actual response pressure and its correspondence to the pressure specified in the passport. If the response pressure does not correspond to that specified in the passport, bring the position of scale 13 into line;

Rough reconfiguration of the drive to other response pressure values is performed:

- to reduce the pressure by setting the screw 31 of the drive 2 with its end to the scale mark 14 corresponding to the required pressure;

- to increase the pressure by installing the nut 32 with its end face on the scale mark 13, corresponding to the required pressure.

Accurate reconfiguration of the drive to the required response pressure when the pressure decreases is performed in the following sequence:

- supply the working medium to the section of the pipeline with the valve and provide it with the pressure at which operation should occur;

- shut off the section of the pipeline with the valve installed in it;

- open bypass valve 10 and equalize the pressure before and after the plate;

- unscrew screw 31 to the “6 MPa” position, loosening spring 34 as much as possible;

- check the position of rod 35 using indicator 15. The indicator should be in position P;

- pull back and turn the handle of the plate lifting mechanism 12 to the STOP position. In this case, the stop of the plate 38 will press the spring-loaded lock of the drive 24 to the side and engage with the stop of the lock 25, ensuring the fixation of the plate 9 in the open position;

- move the handle of the plate lifting mechanism 12 to the AUT position;

- close bypass valve 10;

- slowly, compressing spring 34 with screw 31, record the fall of the shut-off body plate “by ear” and by the rod position indicator 15 (the rod should be in the ZN position), while the position of screw 31 is the required one;

- reinstall scale 14 on screw 31 with a mark corresponding to the pressure value at which the operation opposite the indicator screw occurred.

Accurate reconfiguration of drive 2 to the required response value when pressure increases is performed in the following sequence:

- supply the working medium to the section of the pipeline with the valve and provide it with the pressure at which operation should occur;

- shut off the section of the pipeline with the valve installed in it;

- open bypass valve 10 and equalize the pressure before and after the plate;

- tighten nut 32, compressing spring 33 as much as possible;

- check the position of rod 35 using indicator 15. The indicator should be in position P;

- pull back and turn the handle of the plate lifting mechanism 12 to the STOP position. In this case, the stop of the plate 38 will press the spring-loaded lock of the drive 24 to the side and engage with the stop of the lock 25, ensuring the fixation of the plate 9 in the open position;

- move the handle of the plate lifting mechanism 12 to the AUT position;

- close bypass valve 10;

- slowly unscrew the nut 32, loosening the spring 33, to ensure that the shut-off element is activated, noting the fall of the plate 9 “by ear” and by the rod position indicator 15 (the rod must be in the CB position);

- reinstall scale 13, aligning the corresponding scale value with the response pressure value with the end of nut 32.

Put the valve into operation after its installation on the pipeline and adjustment in the following sequence:

- supply the working medium to the section of the pipeline with the valve and provide it with a working pressure equal to the average value between the set response pressure during increase and decrease;

- shut off the section of the pipeline with the valve installed in it;

- open bypass valve 10 and equalize the pressure before and after the plate;

- check the position of rod 35 using indicator 15. The indicator should be in position P;

- pull back and turn the handle of the plate lifting mechanism 12 to the STOP position. In this case, the stop of the plate 38 will press the spring-loaded lock of the drive 24 to the side and engage with the stop of the lock 25, ensuring the fixation of the plate 9 in the open position;

- move the handle of the plate lifting mechanism 12 to the AUT position;

- close bypass valve 10.

The valve is ready for operation.

Valve operation when the pressure of the working medium in the pipeline increases above the value set by the settings of drive 2.

When the pressure inside the housing 4 increases above the set value of the actuation pressure of the actuator 2, indicated on the scale 13, the actuator rod 35, under the influence of increased pressure, overcoming the force of the compression spring 33, moves upward into the actuator cavity with atmospheric pressure, the axial movement of the rod 35 is transmitted to the spring-loaded torsion spring 23 to the lock 24, which, turning on the axis 22, mounted motionless in the sleeve 30, disengages from the stop of the plate 38, releasing the plate 9, which, under the influence of its own weight and the flow of the medium, rotates on the axis 7 and is pressed against the seat 39, blocking the flow of the working fluid .

Valve operation when the pressure of the working medium in the pipeline drops below the value set by the settings of drive 2.

When the pressure inside the housing 4 decreases below the set value of the actuation pressure of the drive 2, indicated on the scale 14, the drive rod 35, under the force of the spring 34, moves down into the drive cavity with decreasing pressure, the axial movement of the rod 35 is transmitted, spring-loaded by the torsion spring 23, to the lock 24, which, turning on the axis 22, mounted motionless in the sleeve 30, disengages from the stop of the plate 38, releasing the plate 9, which, under the influence of its own weight and the flow of the medium, rotates on the axis 7 and is pressed against the seat 39, blocking the flow of the working medium.

Handle 12 in the operating position of the valve must be in the AUT position; when handle 12 is in the STOP position, the valve cannot be activated by a decrease or increase in the pressure of the working medium. Bypass valve 10 must be closed.

Raising the plate 9 with the handle 12 can only be done after equalizing the pressure before and after the plate 9 by opening the bypass valve 10.

With a relatively simple design of the valve drive, it is possible to install the plate into the operating position and securely fix it in this position without the presence of a mode switching handle in the drive with a minimum number of manipulations when putting the valve into operation and adjustment, as well as reliable operation from a decrease and increase in pressure of the working medium and pipeline closures.

Claims (1)

A shut-off valve containing a body, inlet and outlet flanges, a removable seat installed in the bore of the outlet flange, sealed with a rubber ring and fixed in the axial direction, a rotary shut-off element made in the form of a plate with a stop, a trigger device drive with a sensitive element located on the body , made in the form of a rod loaded with springs, connected to a latch that holds the stop in the open position, a shut-off element equipped with an indicator of the position of the sensing element rod, with the ability to visually monitor the position of the rod, and movable scales of the response pressure of the sensing element, with the ability to install actual pressures on the scales activation of the sensitive element during adjustment, characterized in that the rod has a cylindrical protrusion at the end, the latch is made in the form of a rotary latch, pressed against the cylindrical protrusion of the rod by a torsion spring, has a depression in the shape of a truncated pyramid on the side of the cylindrical protrusion of the rod and a stop of the latch beveled at an angle, configured to engage with the angled stop of the disk when installing the disk in the operating position and fix it in this position when the pressure in the valve body is within the configured operating range and disengage with the stop of the disk and return the disk to the closed position when the pressure is released in the valve body outside the set operating range.