JP2001124235A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the work accompanied by a water leak test of a pipe. SOLUTION: A pressure reducing mechanism unit 3 provided with a pressure reducing mechanism is turnably provided on a valve body 2, and a secondary side pressure chamber 7 in the valve body 2 is communicated with or shut off from a pressure regulating chamber 18 in the pressure reducing mechanism unit 3 communicated therewith to keep the secondary side pressure to be a predetermined pressure lower than the primary side pressure at the turning position with respect to the valve body 2 of this unit 3, and the pressure reducing function is valid or invalid thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve for water supply from door to door.

[0002]

2. Description of the Related Art Conventionally, a pressure reducing valve of this type is attached to a pipe of an apartment house, and after construction, a water leak test is performed on the entire pipe. In this case, a predetermined pressure is applied to the entire pipe to check the state of water leakage at each part. At the time of the water leakage test, if a pressure reducing valve is provided in the pipe, the pressure on the secondary side is reduced. Therefore, when the above test pressure is applied, the pressure reducing valve may be broken. Therefore, in the above case, the pressure reducing valve was once removed, and a water leakage test was performed by attaching an alternative pipe only for passing water here.
After the leak test, the alternative pipe was replaced with a pressure reducing valve.

[0003]

Therefore, in the above case,
The work of replacing the pressure reducing valve and the substitute pipe was troublesome and time-consuming, and such work was extremely troublesome. An object of the present invention is to prevent the pressure reducing function of the pressure reducing valve from operating in such a case as described above, and to save the trouble of replacing with a substitute pipe.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention communicates, via an intermediate chamber, a primary side and a secondary side pressure chamber communicating with an inlet and an outlet, respectively, inside a valve box. The intermediate chamber is provided with a loading port in which the upper part of the valve box is opened, and a rotary shaft protruding from the loading port into the intermediate chamber at the lower center of the pressure reducing mechanism unit is loaded. The pressure reducing mechanism unit is provided with a communication passage between the primary pressure chamber and the secondary pressure chamber, and a valve element for opening and closing a valve port provided in the communication passage is connected to the primary pressure chamber. A valve is provided so as to be detachably attached to a valve seat so as to receive a side pressure in a valve opening direction, and a piston which receives a primary pressure in a valve closing direction is connected to a valve body via a valve rod, and a communication passage is provided through the piston. (Primary pressure chamber),
The secondary pressure chamber is divided into adjacent pressure adjustment chambers via respective partition walls, and the pressure adjustment means provided in the pressure adjustment chamber is connected to the piston, so that the secondary pressure chamber 7, the pressure adjustment chamber, Each of the partition walls slidably joined to each other is provided with a pressure detection hole which communicates with the two chambers at a predetermined rotational position of the pressure reducing mechanism unit with respect to the valve box. The pressure detection hole of the secondary pressure chamber is closed by a partition wall of the pressure adjustment chamber, and the pressure detection hole of the pressure adjustment chamber is communicated with the outside, so that the pressure reducing mechanism unit is rotated with respect to the valve box, and the pressure adjustment chamber is rotated. By making the pressure detection holes of the secondary side pressure chambers coincide with each other, a pressure reducing valve having a normal pressure reducing function is provided. So that the primary side pressure chamber and the secondary side pressure chamber communicate with each other. To solve the above-mentioned problems.

[0005] A pair of engagement main body and an engagement subordinate body are provided in one diameter direction of the loading port in the upper part of the valve box and one diameter direction of the rotary shaft in the lower part of the pressure reducing mechanism unit, respectively. The part and the engagement follower part are provided so as to be mutually disengageable by rotating the pressure reducing mechanism unit with respect to the valve box,
The valve box and the pressure reducing mechanism unit are detachably attached to each other in a state where the engagement main body portion and the engagement follower portion are separated from each other. In a state where the pressure reducing mechanism unit is detached from the valve box, the loading port and the secondary side pressure chamber are closed. By plugging the closure lid into the pressure detection hole, by replacing the pressure reducing mechanism unit and the closure lid for the valve box,
The above problem is solved by making it possible to use both the pressure reducing valve and the substitute pipe without removing the valve box from the pipe.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a pressure reducing valve according to the present invention, wherein the pressure reducing valve 1 is detachably mounted on the valve box 2 and the valve box 2,
It comprises a pressure reducing mechanism unit 3 which is rotatable with respect to the valve box 2 in its mounted state.

The valve box 2 has an inlet 4 and a discharge port 5 on both left and right sides thereof, and a primary pressure chamber 6 and a secondary pressure chamber 7 communicating with the inlet 4 and the discharge port 5 therein. Is provided. The primary-side pressure chamber 6 and the secondary-side pressure chamber 7 communicate with each other through an intermediate chamber 8 having a circular cross section provided at the center of the valve box 2, that is, as shown in FIGS. Is connected to the primary-side pressure chamber 6 and the lower part of the intermediate chamber 8 is connected to the secondary-side pressure chamber 7. In the intermediate chamber 8, an upper wall corresponding to the upper part of the valve box 2 has a circular opening. The loading port 9 of the reduced pressure mechanism unit 3 is provided.

At the upper part of the valve box 2, a pair of engagement main bodies 10, 10 a for connecting to the pressure reducing mechanism unit 3 in one diameter direction of the loading port 9 (the direction of forming the inflow port 4 and the discharge port 5).
Is protruding. The main engagement portions 10 and 10a are formed so that their upper surfaces are flat, are flush with the loading port 9, and are approximately the same width. The engagement main body 10 provided on the inflow port 4 side is provided with a substantially L-shaped cross section, and is formed so that its tip is directed up toward the inflow port 4 side. The engagement main body 10a provided on the discharge port 5 side is adjacent to the discharge port 5 side of the loading port 9 and is formed so as to bulge upward on the same plane as the loading port 9. Of the upper partition wall 11 of the discharge port 5
It extends to the side and is provided in a substantially hook shape. Also, the partition 11
, A pressure detection hole 12 communicating with the secondary pressure chamber 7 is provided. Reference numeral 13 denotes a strainer provided in the primary pressure chamber 6 in the valve box 2.

The decompression mechanism unit 3 is formed by joining and fixing upper and lower casings 14 and 15 via a diaphragm 16, and the diaphragm 16 is moved downward by a diaphragm 16 together with an adjusting spring 17 provided in the upper casing 14. And a pressure adjusting means 19 of a pressure adjusting chamber 18 partitioned into The adjusting spring 17 is interposed between a spring holder 20 which is also used as a diaphragm presser joined to the upper surface of the diaphragm 16 and a spring receiver 22 which is screwed to an adjusting screw 21 which protrudes from the upper end of the upper casing 14 from the outside. I have. The spring receiver 22 screwed to the adjusting screw 21 has a concave groove 22a formed at an appropriate peripheral edge thereof in the thickness direction on a single linear rail 23 protruding vertically from the inner wall of the upper casing 14. An adjustment screw 21 which is mounted and non-rotatably mounted and protrudes upward from the upper end of the upper casing 14.
By rotating the head 21a, the spring receiver 22 is moved up and down, and the elastic force of the adjusting spring 17 is adjusted.

In the lower casing 15, the lower partition 24 of the pressure adjusting chamber 18 is formed flat so as to be joined to the upper surfaces of the engagement main bodies 10, 10a and the upper partition 11 of the secondary pressure chamber 7. At the same time, a substantially cylindrical rotating shaft body 25 is protruded from the center thereof. The rotating shaft 25 is removably loaded into the intermediate chamber 8 through the loading port 9 and, in the loaded state, is slidably contacted with the inner wall of the intermediate chamber 8 in the circumferential direction. The pressure reducing mechanism unit 3 is rotatable with respect to the valve box 2 around the center. The pressure adjusting chamber 18 and the secondary pressure chamber 7 are vertically adjacent to each other via the respective partitions 11 and 24, and the partitions 11 and 24 are slidable by the rotation of the pressure reducing mechanism unit 3. .

When the pressure reducing mechanism unit 3 is mounted on the valve box 2, the lower partition wall 24 of the pressure adjusting chamber 18, the upper partition wall 11 of the secondary pressure chamber 7, and the engagement main portions 10, 10a are joined. I have. In this state, the lower partition wall 24 of the pressure adjustment chamber 18
A pressure detection hole provided in the upper partition 11 of the secondary pressure chamber 7
A pressure detection hole 26 communicable with the valve case 2 is provided therethrough. At a predetermined rotation position of the pressure reducing mechanism unit 3 with respect to the valve box 2, the pressure detection holes 12 and 26 of the secondary pressure chamber 7 and the pressure adjustment chamber 18 are formed. The pressure detection holes 12 of the secondary pressure chamber 7 are closed by the partition wall 24 of the pressure adjustment chamber 18 at the position where the pressure detection holes 12 and 26 do not coincide with each other so that the two chambers 7 and 18 communicate with each other. At the same time, the pressure detection hole 26 communicates with the outside.

In addition, a pair of engagement followers 27, 27a which are detachable from the engagement main bodies 10, 10a are vertically provided on the lower partition wall 24 of the pressure adjusting chamber 18. The engagement followers 27, 27a
Are formed in a substantially L-shaped cross section, and are respectively installed at positions corresponding to the engagement main bodies 10 and 10a in one diameter direction of the rotating shaft body 25,
As shown in FIGS. 1 and 3, the rotation of the pressure reducing mechanism unit 3 causes the pressure detecting holes 12, 26 in the pressure adjusting chamber 18 and the secondary pressure chamber 7 to rotate.
Are aligned, the engagement subordinate portions 27 and 27a correspond to the inflow port 4 and the discharge port 5 side, respectively.
It is set to overlap 10a. From the above state, FIG.
8, the pressure detection holes 1 in the secondary pressure chamber 7 and the pressure adjustment chamber 18 are rotated in a state where the pressure reducing mechanism unit 3 is rotated clockwise by a predetermined angle.
The pressure detection holes 12 of the secondary-side pressure chamber 7 are closed by the partition wall 24 of the pressure adjustment chamber 18 so that the pressure detection holes 26 of the pressure adjustment chamber 18 communicate with the outside. Also, by rotating about 90 degrees counterclockwise or clockwise (90 degrees clockwise in the illustrated example) from the state of FIGS.
In this state, the valve box 2 and the pressure reducing mechanism unit 3 are detachable as shown in FIGS.

In the lower casing 15, a rotary shaft 25 inwardly communicating with a lower portion of the pressure adjusting chamber 18 has primary pressure chambers 6 and 2 with the pressure reducing mechanism unit 3 mounted on the valve box 2. A communication passage 28 with the secondary pressure chamber 7 is provided. This communication passage
Numeral 28 denotes a communication port 29 with a plurality of primary pressure chambers 6 extending in the circumferential direction at the center of the rotating shaft 25 and a lower opening 2 at the lower end of the rotating shaft 25.
A communication port 30 with the secondary pressure chamber 7 (hereinafter, referred to as a valve port 30).
The valve port 30 is provided with a valve element 31 for opening and closing the same. The valve element 31 is provided on a valve seat 30a provided around the valve port 30 so as to be detachable so as to receive the primary pressure in the valve opening direction. In the valve closing direction. or,
The valve body 31 has a valve shaft 34 vertically suspended at the lower center thereof.
Is slidably inserted into a valve shaft guide 35 recessed in the inner bottom of the secondary pressure chamber 7 in the valve box 2.

The piston 33 has a larger pressure receiving area than the valve body 31 and is provided with an O-ring 36 mounted around the piston body 33. Slidably inserted into the cylinder chamber 37 provided between
The communication passage 28 and the pressure adjustment chamber 18 are partitioned in a watertight manner via the piston 33. Further, a piston shaft 38 projects upward from the upper center of the piston 33, connects the piston shaft 38 to the diaphragm 16, connects the pressure adjusting means 19 provided in the pressure adjusting chamber 18 to the piston 33, and displaces the diaphragm 16. The valve element 31 is lifted in response to the pressure.

The diaphragm retainer 39 joined to the lower surface of the diaphragm 16 has a larger diameter than the inner diameter of the cylinder chamber 37, and the diaphragm retainer 39 closes the cylinder chamber 37 when the diaphragm 16 is displaced to the lowermost limit. As a result, the lower end lift of the valve element 31 that has been opened is restricted by locking to the end surface of the opening of the cylinder chamber 37 on the pressure adjustment chamber 18 side (upper side) (see FIG. 7). Further, the upper and lower portions of the communication port 29 on the outer periphery of the rotary shaft body 25 and the pressure detecting holes 12 in the upper partition 11 of the valve box 2.
O-ring grooves are engraved around the circumference, and O-ring grooves are
With the rings 40, 40a, 41 attached and the pressure reducing mechanism unit 3 attached to the valve box 2, each connecting point is sealed.
Reference numeral 42 designates a member which is mounted on the inflow port 4 side in a state where the pressure reducing mechanism unit 3 is mounted on the valve box 2 and the pressure detecting holes 12 and 26 of the secondary pressure chamber 7 and the pressure adjusting chamber 18 are continuous. A screw which is screwed through from the outside of the mating body portion 27, and the tip of the screw 42 is hooked on the engaging main body portion 10 which is engaged with the engaging subbody portion 27, and the pressure in the valve box 2 is reduced. The rotation of the mechanism unit 3 is restricted.

The pressure reducing valve 1 constructed as described above
Are the secondary pressure chamber 7 and the pressure adjustment chamber as shown in FIGS.
The pressure reducing valve 1 has a normal pressure reducing function in a state where the 18 pressure detecting holes 12 and 26 are continuous. That is, the fluid flowing from the primary pressure chamber 6 to the secondary pressure chamber 7 via the valve port 30 by opening the valve is:
The pressure flows into the pressure adjusting chamber 18 through the pressure detection holes 12 and 26, and the upward (valve closing direction) force of the diaphragm 16 due to the secondary pressure and the downward (valve opening direction) force of the adjusting spring 17 are generated. By balancing, the opening of the valve element 31 is adjusted,
The secondary pressure is maintained at a certain pressure lower than the primary pressure.

As shown in FIGS. 7 and 8, the pressure reducing mechanism unit 3 is rotated with respect to the valve box 2 so that the pressure detecting holes 12 and 26 of the secondary pressure chamber 7 and the pressure adjusting chamber 18 are separated from each other. By releasing the communication between the chambers 7 and 18, the pressure reducing function of the pressure reducing valve 1 does not work. Further, the pressure detecting hole 12 is closed and sealed by the partition wall 24 of the pressure adjusting chamber 18, and the pressure detecting hole 26 is closed. To the outside, the inside of the pressure adjusting chamber 18 becomes the atmospheric pressure, and the adjusting spring
Only the elastic force of 17 acts on the diaphragm 16 to open the valve body 31 and the primary pressure chamber 6 and the secondary pressure chamber 7 communicate. Therefore, with the pressure reducing valve 1 attached to the pipe,
When performing a water leak test on the entire pipe, simply rotating the pressure reducing mechanism unit 3 as described above can be used as a conventional alternative pipe. Further, as shown in FIGS. 9 and 10, when the pressure reducing mechanism unit 3 is detached from the valve box 2, the closing lids 43 and 43a are sealed in the loading port 9 and the pressure detecting hole 12 of the secondary pressure chamber 7. You can also. Thus, a conventional alternative pipe can be used with the valve box 2 installed on the pipe.

[0018]

In summary, the present invention according to the first aspect has the above-described structure, and thus, the pressure reduction mechanism unit 3 is rotated with respect to the valve box 2 so that the pressure detection holes of the secondary pressure chamber 7 and the pressure adjustment chamber 18 are formed.
By making the 12 and 26 continuous, the two chambers 7 and 18 can communicate with each other so that the decompression function can operate normally. Also, the pressure detection holes 12 and 26 are made discontinuous and the pressure in the secondary pressure chamber 7 is reduced. Detection hole
The valve body 31 is opened by closing the 12 with the partition wall 24 of the pressure adjusting chamber 18 and communicating the pressure detecting hole 26 of the pressure adjusting chamber 18 to the outside, so that the primary pressure chamber 6 and the secondary pressure are closed. The chamber 7 can be communicated to allow water to flow without the function of depressurization, and the depressurization function is enabled or disabled by rotating the depressurization mechanism unit 3 as described above during and after the leak test of the piping. This eliminates the need for replacing the pressure reducing valve and the substitute pipe as in the conventional case. Further, by replacing the pressure reducing valve and the substitute pipe with the conventional pipe, it is possible to solve the problem that the pipe is distorted.

According to the second aspect of the present invention, the decompression mechanism unit 3 can be easily attached to and detached from the valve box 2 depending on the rotational position of the decompression mechanism unit 3 with respect to the valve box 2, so that the assembly is simple and the decompression mechanism is simplified. Unit 3 can be easily replaced and maintained.

Further, according to the third aspect of the present invention, when the pressure reducing mechanism unit 3 is detached from the valve box 2, the closing lids 43, 43a are formed in the loading port 9 and the pressure detecting hole 12 of the secondary pressure chamber 7.
Can be sealed without closing the
Water is passed from the secondary pressure chamber 6 to the secondary pressure chamber 7, and there is no need to remove the valve box 2 from the pipe even with such means.
The practical effect is extremely large, for example, the workability during and after the water leakage test can be improved and the generation of distortion in the piping can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pressure reducing valve.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a plan view of a valve box.

FIG. 5 is a longitudinal sectional view of the valve box.

FIG. 6 is a cross-sectional view of the valve box.

FIG. 7 is a longitudinal sectional view of the pressure reducing valve when the pressure reducing function is released.

FIG. 8 is a sectional view taken along the line AA of FIG. 7;

FIG. 9 is a longitudinal sectional view of the pressure reducing valve when the pressure reducing mechanism unit is detached.

FIG. 10 is a sectional view taken along the line AA of FIG. 9;

[Explanation of symbols]

 2 valve box 3 pressure reducing mechanism unit 4 inflow port 5 discharge port 6 primary side pressure chamber 7 secondary side pressure chamber 8 intermediate chamber 9 loading port 10, 10a engaging main body 11 partition 12 pressure detection hole 18 pressure adjustment chamber 19 pressure Adjusting means 24 Partition wall 25 Rotating shaft 26 Pressure detecting hole 27, 27a Engagement follower 28 Communication passage 30 Valve port 30a Valve seat 31 Valve 32 Valve rod 33 Piston 43, 43a Closure lid

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroyuki Mizuno 955-5, Miyamae, Irikade-Nitta-shi, Komaki-shi, Aichi Prefecture F-term inside the Yoshitake Komaki Plant (reference) 3H060 AA04 BB03 CC07 DC05 DC12 DD04 DD17 EE06 FF01 HH03 HH14 5H316 AA07 BB08 DD13 DD20 EE02 EE10 EE12 EE20 JJ01 JJ13 KK02

Claims (3)

[Claims] A first pressure chamber and a second pressure chamber communicating with an inlet and a discharge port, respectively, are provided inside a valve box so as to communicate with each other through an intermediate chamber. An open loading port is provided, and a rotary shaft protruding from the loading port at the lower center of the pressure reducing mechanism unit is loaded into the intermediate chamber, and the pressure reducing mechanism unit is configured to be rotatable with respect to the valve box. ,
A communication passage between the primary pressure chamber and the secondary pressure chamber is provided, and a valve body for opening and closing a valve port provided in the communication passage is mounted on a valve seat so as to receive the primary pressure in a valve opening direction. A piston that receives the primary pressure in the valve closing direction is connected to the valve element via a valve rod, and the piston is connected to the communication passage and the secondary pressure chamber through the respective partition walls. Each of the partition walls is formed by partitioning an adjacent pressure adjusting chamber and connecting a pressure adjusting means provided in the pressure adjusting chamber to the piston and slidably joining the secondary pressure chamber and the pressure adjusting chamber. A pressure detection hole that communicates with both chambers at a predetermined rotational position of the pressure reducing mechanism unit with respect to the valve box;
A pressure reducing valve characterized in that a pressure detection hole of the next pressure chamber is closed by a partition wall of the pressure adjustment chamber, and the pressure detection hole of the pressure adjustment chamber is communicated with the outside. 2. A pair of engaging body portions and an engaging subordinate portion are provided in one diameter direction of a loading port in an upper portion of a valve box and in a diameter direction of a rotating shaft body in a lower portion of a pressure reducing mechanism unit, respectively. The part and the engagement follower part are provided so as to be mutually disengageable by rotating the pressure reducing mechanism unit with respect to the valve box,
2. The pressure reducing valve according to claim 1, wherein the valve box and the pressure reducing mechanism unit are detachable in a state in which the engagement main body portion and the engagement subordinate portion are separated from each other. 3. The pressure reducing valve according to claim 2, wherein, when the pressure reducing mechanism unit is detached from the valve box, a closing lid is sealed in the loading port and the pressure detection hole of the secondary pressure chamber.