JPS6391715A - Reducing valve with relief valve - Google Patents

Abstract

PURPOSE:To allow water discharged when a relief valve operates to flow outside a valve box, instead of leading said water to the side of a spring case from a pressure-sensitive plate by linking the outer end part of a balancing piston to the pressure-sensitive plate so that said part can freely come near and away and providing a discharge port communicating with the outside through the inner channel of the piston. CONSTITUTION:The outer end side of the balancing piston 4 linked to a reducing valve 31 is linked to the pressure-sensitive plate 2 so that said side can freely come near and away. The plate is assembled onto the valve box 1 so that it can sense secondary pressure and operate. The barrel part of the valve box 1 is provided with the discharge port (b) communicating with the outside in a part held so as to attain water-tightness by the fitting of the outer periphery of the balancing piston 4. The channel 6 communicating with the discharge port (b) is formed in the interior of the balancing piston 4. Even if pressure at a secondary side rises abnormally, it comes to relieve from the discharge port installed on the barrel part of the valve box to the outside through the inner channel of the balancing piston.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pressure-reducing valve that controls opening and closing of communication between the primary side and the secondary side, which is connected to a pressure-sensitive plate that operates by sensing secondary pressure.
The present invention relates to a pressure reducing valve with a relief valve that is configured to maintain pressure on the secondary side within a set pressure, and a relief valve that releases pressure due to an abnormal increase in pressure on the secondary side.

A pressure reducing valve is usually used in combination with a relief valve, but in the past, the pressure reducing valve and the relief valve were manufactured separately, and there was no one that was combined in one piece. When in use, they were combined and attached separately.

In order to avoid this troublesome installation work, there is a demand for a pressure reducing valve with a relief valve that is integrated with the pressure reducing valve, and in order to meet this demand, the applicant has developed a configuration as shown in FIG. We developed and applied for a pressure reducing valve with a relief valve.

This pressure reducing valve with a relief valve has a pressure sensitive plate 2 assembled to a valve box 1 so as to detect secondary pressure and operate.
A balance piston 4 connected to a pressure reducing valve 31 installed in the valve box 1 to control the opening and closing of a valve port 30 communicating with the
A relief valve a is provided at the outer end of the piston 4, and a discharge port opened and closed by the relief valve a is connected to the pressure sensitive plate The pressure reducing valve 31 closes the valve port 30 that communicates the primary side X and the secondary side Y when the pressure on the secondary side Y exceeds the set pressure. When the pressure on the secondary side Y becomes abnormally high while being held at that position, the pressure reducing valve 31
The balance piston 4, which is connected to the pressure reducing valve 31 and does not move, is left in that position as the piston 4 hits the pressure reducing valve seat 32 around the valve port 30 and is prevented from rising. As the pressure-sensitive plate 2 rises, the outer end of the piston 4 and the pressure-sensitive plate 2 are separated as shown in FIG. 2, and the outlet provided in the pressure-sensitive plate 2 is opened. It acts so that the pressure on the secondary side Y escapes to the outside through this discharge port.

However, in this method, since the pressure-sensitive plate 2 is provided with a discharge port serving as a relief port, the pressure (water) discharged from the discharge port when the relief valve operates is applied to the pressure-sensitive plate 2 and the valve box. a spring case 5 provided on the outside of the pressure sensitive plate 2 so as to be assembled to the pressure sensitive plate 2;
A spring 51 and a spring support fitting 5 are installed in the spring case 50 so that the pressure sensitive plate 2 faces the pressure on the secondary side Y.
2, etc. come into contact with water, which causes the inconvenience of impairing its function as a pressure reducing valve due to corrosion such as rust, and the fact that a discharge port is provided in the spring support fitting 52, and drainage is provided in the spring case 50 or cover 54. The need to provide the outlet 50a increases costs, and since the outlet is installed in the spring support fitting 52, if the piping connected to the drain outlet 50a is not removed during maintenance, the mounting of the spring case 50 will be damaged. There are disadvantages such as the fact that it cannot be removed and inspection and removal of the pressure sensitive plate 2 etc. is inconvenient.

The present invention has been made in order to solve the above-mentioned problems occurring in the above-mentioned means, in which a relief valve attached to a pressure reducing valve guides discharged water from the pressure sensitive plate to the spring case side when the relief valve is activated. The purpose of the present invention is to provide a new means that allows the liquid to flow out of the valve box without causing any damage.

In the present invention, as a means to achieve this objective, a valve opening that communicates the primary side and the secondary side is opened and closed on a pressure sensitive plate assembled in the valve box so as to sense the secondary pressure and operate. The outer end side of a balance piston that is connected to a pressure reducing valve installed in the valve box for control is connected so as to be able to connect freely, and the body of the valve box has a surface that is connected to the outer peripheral surface of the balance piston. A discharge port leading to the outside is provided in a portion that is held watertight by fitting, a pipe is formed inside the balance piston with one end communicating with the discharge port, and the other end of the pipe is connected to the piston. The present invention proposes a pressure reducing valve with a relief valve, which is opened in a region watertightly surrounded by the outer end of the pressure sensitive plate connected to the outer end of the pressure sensitive plate.

Next, an example of implementation will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the conventional means are used for constituent members having the same effect.

Fig. 3 is a longitudinally sectioned front view of a pressure reducing valve A with a relief valve that can implement the present invention, and Fig. 4 is a longitudinally sectioned side view. Valve box 1 to operate
30 is a valve port that communicates the primary side or secondary side Y in the valve box l, 31 is a pressure reducing valve that controls the opening and closing of the valve port 30, and 4 is a pressure reducing valve 31. In the connected balance piston (balance valve), b indicates an outlet provided in the body of the valve box 1 so as to communicate with the outside air.

The valve box 1 is equipped with a water inlet lO formed in a connecting pipe for connecting a pipe leading to a water faucet etc. on the negative side (left side in FIG. 3),
The other side is provided with a water outlet 11 formed in a connecting pipe that connects a pipe communicating with a boiler etc., and the water outlet 11 is provided on the upper surface side.
A pressure sensitive plate 2 that operates by sensing pressure fluctuations on the secondary side Y that communicates with the water inlet 10 is installed inside, and separates the primary side X that communicates with the water inlet 10 and the secondary side Y that communicates with the water outlet 11. Bulkhead 1
2, an axially cylindrical cylindrical part 13 whose axial direction is the vertical direction is provided to communicate with the primary side X, and an open opening on the lower end side of the cylindrical part 13 connects the primary side A pressure reducing valve seat 32 facing the pressure reducing valve 31 is formed on the edge of the valve port 30.

The pressure reducing valve 31 faces the pressure reducing valve seat 32 from below so as to be movable forward and backward, and is pushed out toward the pressure reducing valve seat 32 by a pressure reducing operation spring 33, and is connected to the pressure reducing valve 31. A predetermined pressure reduction operation is performed by repeatedly striking the pressure sensitive plate 2 with the upper end side of the above-mentioned balance piston 4, which is integrally formed with the rod 34.

Therefore, the piston 4 has an upper end side (
A cylindrical portion 13 that fits into the outer end (outer end side) and the lower end (inner end side)
O-ring 40 for maintaining watertightness between the inner peripheral surface of the
40 are respectively attached, thereby forming a portion C in the body of the valve box 1 that is held watertight by the outer circumferential surface of the piston 4. In this watertight portion C, the peripheral wall of the cylindrical portion 13 forms an outer wall of the valve box 1, as shown in FIG. It is.

Further, a pipe line 6 is formed inside the piston 4, one end of which communicates with the watertightly held portion C via a boat 60, and the other end of the pipe line 6. The side is
At the end surface of the upper end of the piston 4.

A boat 61 is provided in a watertight area surrounded by a joint between the upper end of the piston 4 and the pressure sensitive plate 2.

The connecting portion between the upper end side of the piston 4 and the pressure sensitive plate 2 is a relief valve formed in an annular shape surrounding the boat 61 on the other end side of the pipe line 6 on the upper end side of the piston 4. 7o is formed integrally and continuously with the material forming the piston 4, or is formed separately and installed on the upper surface side of the piston 4 by moving it upwardly, On the side of the pressure sensitive plate 2, a valve seat 71 facing the relief valve 7o is provided, and the valve 70 and the valve seat 71 are connected to each other to establish a connection. ing.

In the illustrated embodiment, 50 is a spring case that also serves as an assembly member for assembling the pressure-sensitive plate 2 to the upper surface of the valve case 1, and 51 is a spring case for attaching the pressure-sensitive plate 2 to the secondary side. A spring 52 is mounted on the upper surface of the pressure sensitive plate 2 to support the lower end of the spring 51, and 53 is a spring that supports the upper end of the spring 51. an adjustment screw screwed into the upper end of the spring case 50;
80 is a reverse valve provided on the primary side X in the valve box 1, 81 is a strainer, and 182 is a negative pressure operating mechanism.

The embodiment device configured as described above operates as follows.

When the pressure on the secondary side Y is lower than the set pressure, the spring 51
As the pressure sensitive plate 2 is pushed down by the spring pressure of
is opened, allowing hot water and water to flow from the primary side X to the secondary side Y. When the pressure on the secondary side Y increases due to this, the pressure sensitive plate 2 moves upward against the spring pressure of the spring 51, and the pressure reducing valve 31 is pushed up by the pressure reducing operation spring 33, and the pressure reducing valve 31 is pushed up by the pressure reducing operation spring 33. Approach the valve seat 32 and narrow the opening degree of the valve port 30.

Next, when the pressure on the secondary side Y becomes close to the set pressure, the pressure reducing valve 31 contacts the pressure reducing valve seat 32 and closes the valve port 3o.
This will stop the flow of hot water and water into the secondary side Y. As a result, the pressure on the secondary side Y is maintained at the set pressure.

Next, in a state where the pressure on the secondary side Y is maintained at the set pressure and the pressure reduction valve 31 abuts against the pressure reduction valve seat 32 and closes the valve port 30, the boiler connected to the secondary side Y When the pressure on the secondary side Y becomes abnormally high due to an increase in temperature inside the can, the pressure reducing valve 31 collides with the pressure reducing valve seat 32 and does not move, causing the balance piston 4 to go into the state shown in Fig. 3. The pressure sensitive plate 2 moves upward while leaving the piston 4 in this position, and the outer end of the piston 4 and the inside of the pressure sensitive plate 2 are separated as shown in FIG. The relief valve constituted by the seat 71 is in an open state, and the pressure on the secondary side Y is discharged from the boat 61 opened at the outer end of the piston 4 to the pipe as shown by the arrow in FIG. It flows through the passage 6 into the watertight portion C in the valve box 1, and is discharged from there to the outside via the discharge port.

As explained above, the pressure reducing valve with a relief valve according to the present invention communicates the primary side The outer end side of a balance piston 4 connected to a pressure reducing valve 31 installed in the valve box 1 to control the opening and closing of the valve port 30 is connected in a detachable manner. Balance piston 4
A discharge port leading to the outside is provided at a portion that is held watertight by fitting with the outer circumferential surface of the balance piston 4, and a conduit 6 with one end communicating with the discharge port is formed inside the balance piston 4; Since the other end of the conduit 6 is opened at the outer end of the piston 4 in a part that is watertightly surrounded by the joint between the outer end and the pressure sensitive plate 2, the pressure on the secondary side is When the pressure becomes abnormally high and the relief valve opens, the pressure on the secondary side passes through the piping in the inner cavity of the balancing piston and is discharged to the outside from the outlet provided in the body of the valve body. Therefore, there is no need to provide a discharge port in the pressure sensitive plate and the spring case, and problems such as the inside of the spring case becoming submerged in water and troublesome maintenance can be solved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a conventional pressure reducing valve with a relief valve, FIG. 2 is a longitudinal sectional front view of the same relief valve when it is in operation, FIG. 3 is a longitudinal sectional front view of a pressure reducing valve with a relief valve according to the present invention, and FIG. The figure is a longitudinal side view of the same as the above, and FIG. 5 is a longitudinal side view of the same when the relief valve is in operation. Explanation of drawing symbols A...Pressure reducing valve with relief valve Part 1...Valve box lO...Water inlet 11...
・Water outlet 12...Partition wall 13...Cylindrical part
2... Pressure sensitive plate 30... Valve port 3
1... Valve for pressure reduction 32... Valve seat for pressure reduction 33...
・Decompression operation spring 34...Valve rod 4...Piston 40...O ring 50...Spring case 50a...Drain port 51...Spring 52...
・Spring support fitting 53...Adjustment screw 54...Cover 6...Pipe line 60/61...Boat
7o... Valve 71 for through valve... Valve seat
80...Check valve 81...Strainer 82...Negative pressure operating mechanism Approval application NTC Industrial Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A pressure sensitive plate 2 is assembled into the valve box 1 to operate by sensing secondary pressure, and a valve port 30 that communicates the primary side X and the secondary side Y is installed in the valve box 1 to control opening and closing. The outer end side of the balance piston 4 connected to the pressure reducing valve 31 is connected so as to be freely releasable and detachable, and is held in the body of the valve box 1 in a watertight manner by fitting with the outer peripheral surface of the balance piston 4. A discharge port b that communicates with the outside is provided at a portion where the discharge port b is connected, a pipe line 6 whose one end side communicates with the discharge port b is formed inside the balance piston 4, and the other end side of the pipe line 6 is connected to the piston 4. A pressure reducing valve with a relief valve is opened at the outer end side of the pressure sensitive plate 2 in a part that is watertightly surrounded by the outer end side and the pressure sensitive plate 2.