JP2002108458A - Pressure reducing valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save labor involved in a water leakage examination of piping and also to always maintain a water flow state during the examination. SOLUTION: A pressure reducing mechanism unit 3 provided with a pressure reducing mechanism is attached to a valve box 2 in a freely turnable way, and a pressure reducing function is made to be effective or ineffective by communicating or disconnecting a secondary side pressure chamber 7 in the box 2 to/from a pressure regulation chamber 18 in the unit 3 for communicating with the chamber 7 and holding secondary side pressure at certain fixed pressure that is lower than primary side pressure according to the turning position of the unit 3 with respect to the box 2. In the ineffective state of the pressure reducing function, projecting pieces 40 and 40a projecting outwardly in one diameter direction of the rear part of a valve element 35 are arranged face to face with valve closing blocking pieces 41 and 41a arranged only at the front of a movement path in the direction of closing the valve, and the valve element 35 is not closed even though pressure inside the box 2 goes up.

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 this water leak test, if there is a pressure reducing valve in the piping, the pressure on the secondary side will be low. When the above test pressure is applied to the secondary side, the pressure reducing valve may be broken. Therefore, in the above case, once the pressure reducing valve is removed,
A leak test was performed by attaching a substitute pipe only for passing water here, and after the leak test, the substitute pipe was replaced with a pressure reducing valve.

[0003]

For this reason, the work of replacing the pressure reducing valve and the substitute pipe requires time and effort, and such work is 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. Between the primary pressure chamber and the secondary pressure chamber. In addition, in the above-mentioned mismatched state, the water leakage test is performed by causing the protruding piece protruding outward in one diameter direction of the back of the valve body to face the valve closing prevention piece arranged only in front of the movement path in the valve closing direction. Inside, the pressure inside the valve box rises,
Even if a pressing force acts on the piston in the valve closing direction, the protruding piece is hooked on the valve closing preventing piece to maintain the valve open state and allow water to flow without any trouble.

In addition, a projection is provided outside the pressure reducing mechanism unit, and a barrier for stopping the projection at a position corresponding to the coincidence state and the non-coincidence state of each pressure detection hole on the rotation trajectory of the projection. The switching operation can be simplified by applying or not applying the pressure reducing function at the position where the protrusion projects against the barrier. In addition, by providing indicator means for matching and mismatching of the pressure detection holes outside the pressure reducing valve, the two states of the pressure reducing valve can be visually recognized. Also, by providing a rotation control means for suppressing the rotational movement to the mismatched state when the pressure reducing mechanism unit is rotated from the mismatched state of each pressure detection hole to the matched state,
After the water leakage test, the pressure reducing function can be operated only by rotating the pressure reducing mechanism unit in the rotatable direction, thereby eliminating erroneous operations.

[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 top of the valve box 2, a pair of engagement main bodies 10 for connecting to the pressure reducing mechanism unit 3 in one diameter direction around the loading port 9 (the direction of forming the inflow port 4 and the discharge port 5),
10a protrudes. 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 formed so as to protrude upward on the same plane as the loading port 9 adjacent to the discharge port 5 side of the loading port 9.
In the upper partition wall 11 of the next-side pressure chamber 7, the partition wall surface 11 is formed so as to extend toward the discharge port 5 side and has a substantially hook shape. A pressure detection hole 12 communicating with the secondary pressure chamber 7 is formed through the partition wall 11. 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 adjustment spring 17 is interposed between a spring holder 20 which is also used as a diaphragm holder joined to the upper surface of the diaphragm 16, and a spring receiver 22 which is screwed to an adjustment 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 around the rotary shaft 25, and as shown in FIGS. 3, the pressure detection holes 12 in the pressure adjustment chamber 18 and the secondary pressure chamber 7,
In the state where 26 is matched, each of the engagement followers 27 and 27a is positioned corresponding to the inflow port 4 and the discharge port 5 side, and the engagement main body 1
0 and 10a are set so as to overlap. Pressure detection hole 1 above
A state in which the pressure reducing mechanism unit 3 is rotated clockwise by a predetermined angle as shown in FIGS.
The pressure detection holes 12 and 26 of the secondary pressure chamber 7 and the pressure adjustment chamber 18 are separated from each other, and the pressure detection hole 12 of the secondary pressure chamber 7 is It is closed, and the pressure detection hole 26 of the pressure adjustment chamber 18 is communicated with the outside. As described above, the engagement main body portions 10 and 10a and the engagement follower portions 27 and 27a are engaged with the valve box 2 so that the pressure reducing mechanism unit 3 is rotatably held. Also, the pressure detection holes 12 shown in FIGS.
By turning about 90 degrees counterclockwise or clockwise (turning clockwise 90 degrees in the illustrated example) from the mating state of 26, the main engagement portion
In this state, the valve box 2 and the pressure reducing mechanism unit 3 are detachable, as shown in FIGS. 11 and 12.

In addition, a convex portion 28 is formed at a substantially intermediate position in the width direction below the engagement subordinate portion 27 located on the inflow port 4 side.
On the rotational orbit of the convex portion 28, the convex portions at positions X and Y (hereinafter, referred to as a coincident position X and a non-coincidence position Y) corresponding to the coincidence state and the non-coincidence state of the pressure detection holes 12 and 26, respectively.
Barriers 29 and 30 are provided to stop 28. The barrier 29 at the matching position X protrudes outside the rising wall 10b of the engagement main body 10, while the barrier 30 at the mismatching position Y is formed on the arc-shaped wall 31 extending from the rising wall 10b to the mismatching position Y. A bolt is screwed outwardly. Therefore, the convex portion 28 (decompression mechanism unit 3) has the barriers 29 at the coincidence position X and the non-coincidence position Y,
Uncoordinate position Y consisting of bolts that can rotate and move only between 30
11 and 12 unless the barrier 30 of FIG.
As shown in FIG. 3, the pressure reducing mechanism unit 3 cannot be detached from the valve box 2. As described above, since the decompression mechanism unit 3 can be attached to and detached from the valve box 2, its assembly is easy, and replacement and maintenance of the decompression mechanism unit 3 are also simplified.

In the lower casing 15, a rotary shaft 25 inwardly communicating with the lower part 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 32 with the secondary pressure chamber 7 is provided. This communication passage
Reference numeral 32 denotes a communication port 33 with a plurality of primary-side pressure chambers 6 formed in the center of the rotary shaft 25 in the circumferential direction and a lower opening 2 provided at the lower end of the rotary shaft 25.
A communication port 34 with the next-side pressure chamber 7 (hereinafter, referred to as a valve port 34).
The valve port 34 is provided with a valve 35 for opening and closing the same. The valve element 35 is provided on a valve seat 34a provided around the valve port 34 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 35 has a valve shaft 38 suspended from the lower center thereof.
Is slidably inserted into a valve shaft guide 39 which is recessed in the inner bottom of the secondary pressure chamber 7 in the valve box 2.

A pair of projecting pieces 40, 40a are provided on the back of the valve body 35 in one diameter direction so as to project outward, and the projecting pieces 40, 40a
When the pressure detection holes 12 and 26 do not match, the projections 40 and 40a
(Valve 35) is opposed to the valve closing prevention pieces 41, 41a arranged only in front of the moving path in the valve closing direction. Prong 4
The specific projection direction of the pressure detection holes 0 and 40a is in a state where the pressure detection holes 12 and 26 do not coincide with each other, and as shown in FIGS. In the disagreement state of 12 and 26, as shown in FIGS.
The 40, 40a is phased at a predetermined angle to the inflow port 4 and the discharge port 5 side, and is directed in a direction away from the arrangement position of the valve closing prevention pieces 41, 41a. As shown in FIGS. 2, 6, and 7, the valve closing preventing pieces 41 and 41a are provided in the secondary pressure chamber 7 on a line perpendicular to the direction of the inflow port 4 or the discharge port 5 in the centripetal direction of the secondary pressure chamber 7. The pressure detection hole 12,
Only in the non-coincidence state of 26, it corresponds to the forward movement path of the protruding pieces 40, 40a in the valve closing direction. Then, the pressure detection holes 12, 26
Of the valve element 35 that is open
0, 40a are configured such that the movement path is blocked by the valve closing prevention pieces 41, 41a disposed above (in front of the movement path in the valve closing direction) and the valve opening state is maintained. Hole 12,
In the coincident state of 26, since the protruding pieces 40 and 40a are in phase as described above, the valve closing preventing pieces 41 and 41a
Does not exist, so that the valve body 35 can be freely attached to and detached from the valve seat 34a.

The piston 37 has a pressure receiving area larger than that of the valve body 35, and is provided with an O-ring 42 mounted around the piston 37. Slidably inserted into the cylinder chamber 43 provided between
The communication passage 32 and the pressure adjustment chamber 18 are partitioned in a watertight manner via the piston 37. Further, a piston shaft 44 projects upward from the upper center of the piston 37, the piston shaft 44 is connected to the diaphragm 16, the pressure adjusting means 19 provided in the pressure adjusting chamber 18 is connected to the piston 37, and the displacement of the diaphragm 16 is changed. The valve body 35 is lifted in accordance with the pressure.

The diaphragm retainer 45 joined to the lower surface of the diaphragm 16 has a larger diameter than the inner diameter of the cylinder chamber 43, and the diaphragm retainer 45 closes the cylinder chamber 43 when the diaphragm 16 is displaced to the lowermost limit. As shown in FIG. 8, the lower limit lift of the valve body 35 that is opened is locked by locking to the end surface of the opening of the cylinder chamber 43 on the pressure adjustment chamber 18 side (upper side). Further, the upper and lower portions of the communication port 33 on the outer periphery of the rotary shaft body 25 and the pressure detection 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 46, 46a and 47 mounted and the pressure reducing mechanism unit 3 mounted on the valve box 2, each connecting point is sealed.

In the pressure reducing valve 1 configured as described above, only the elastic force of the adjusting spring 17 presses the valve body 35 through the diaphragm 16 in the valve opening direction during the water leakage test after the piping of the pressure reducing valve 1. In this state, the pressure reduction mechanism unit 3 is rotated with respect to the valve box 2 from the state shown in FIG. 1 to the pressure detection in the secondary pressure chamber 7 and the pressure adjustment chamber 18 as shown in FIGS. When the holes 12 and 26 are separated from each other to release the communication between the two chambers 7 and 18, the pressure reducing function of the pressure reducing valve 1 does not work. At this time, the valve body 35 in the opened state has a projection provided on the back thereof. The pieces 40, 40a move so as to overlap below the valve closing prevention pieces 41, 41a. Further, the pressure detection hole 12 is closed and sealed by the partition wall 24 of the pressure adjustment chamber 18, and the pressure detection hole 26 is externally provided. By communicating with each other, the inside of the pressure adjusting chamber 18 becomes the atmospheric pressure, and only the elastic force of the adjusting spring 17 acts on the diaphragm 16 and To maintain the open state of 35, the primary-side pressure chamber 6 and the secondary-side pressure chamber 7 communicates. Therefore, when performing a water leakage test on the entire pipe in a state where the pressure reducing valve 1 is attached to the pipe, simply rotating the pressure reducing mechanism unit 3 as described above can be used as a conventional alternative pipe. Further, since the protruding pieces 40, 40a moved below the valve closing prevention pieces 41, 41a prevent the valve body 35 from moving in the valve closing direction as described above, the primary pressure increases during the water leakage test. When the pressing force acts on the piston 37 in the valve closing direction, the valve
35 always keeps the water flowing state during this test with the valve open.

Then, after the water leakage test, FIG.
As shown in FIG. 3, the pressure reducing mechanism unit 3 is rotated with respect to the valve box 2, and the pressure detecting holes 12 of the secondary pressure chamber 7 and the pressure adjusting chamber 18 are rotated.
Repeat 26. At the same time, as shown in FIG.
The projecting pieces 40, 40a are separated from below the 41a, and the projecting pieces 40, 40a
The valve closing member 41, 41a does not exist in the movement path of the valve, and the valve body 35 is movable. Therefore, the pressure reducing valve 1 has a normal pressure reducing function.
That is, the fluid flowing from the primary pressure chamber 6 to the secondary pressure chamber 7 through the valve port 34 by opening the valve flows into the pressure adjustment chamber 18 through the pressure detection holes 12 and 26, and By balancing the upward (valve closing direction) force on the diaphragm 16 due to the side pressure and the downward (valve opening direction) force by the adjusting spring 17, the opening degree of the valve body 35 is adjusted, and the secondary side pressure is reduced. It is kept at a certain pressure lower than the primary pressure.

The arc wall surface 31 is provided with a rotation control means 48 for the pressure reducing mechanism unit 3. This rotation control means
48 moves the pressure reducing mechanism unit 3 from the mismatch position Y (corresponding to the mismatch state of the pressure detection holes 12 and 26) (the pressure detection holes 12 and 26).
The rotation control means 48 controls the rotation to the non-coincidence position Y at the time of rotation to the coincidence position X (corresponding to the coincidence state 26). Indicator means 49 for visually confirming the matching state and mismatching state of the holes 12, 26 are also provided. Hereinafter, the rotation control means 48
Will be described with reference to the drawings. First, a first example is shown in FIGS. 13 is a front view of the pressure reducing valve in which the pressure detection holes 12 and 26 do not match, FIG. 14 is a plan view of FIG. 11, FIG. 15 is a front view of the pressure reducing valve in which the pressure detection holes 12 and 26 match, FIG. Fig. 15
FIG. The rotation control means 48 is a metal fitting formed by bending a metal plate having a spring action, and has its base end fixed by a bolt (barrier 30) provided at the mismatch position Y. Then, a substantially L-shaped bent portion 50 is formed to extend upward from the base end, and a plate-shaped detent portion 51 is continuously formed at the upper end of the bent portion 50. It is arranged on the joint surface 14 a of the casing 14 with the lower casing 15. Here, the detent part 51 is arranged so as to press it against the joining bolt V of the upper and lower casings 14, 15 in a state where the pressure detecting holes 12, 26 are not aligned (see FIGS. 13, 14). When the pressure reducing mechanism unit 3 is rotated from the state so that the pressure detection holes 12 and 26 coincide with each other, the detent portion 51 slides down from the joining bolt V and is horizontally arranged on the joining surface 14a. By circumscribing one side to the joining bolt V, the rotation of the pressure reducing mechanism unit 3 to the mismatch position Y is prevented. In addition, a pointer 52 is provided at an appropriate position of the detent part 51, and the pointer 52 indicates a coincidence state and a non-coincidence state of the pressure detection holes 12, 26 at an appropriate position of the upper casing 14 indicated by the coincidence position X and the disparity position Y. The indications 53 and 53a (◇ and ◇ in the illustrated example) are provided to form the index means 49.

Next, a second example of the rotation control means 48 will be described with reference to FIGS.
It will be described based on. FIG. 17 is a front view of the pressure reducing valve in which the pressure detection holes 12 and 26 match, FIG. 18 is a left side view of FIG. 17, and FIG.
20, FIG. 20 is a plan view of FIG. 17, and FIG. 21 is a cross-sectional view of the pressure detection holes 12, 26 in a mismatched state. The rotation control means 48 is also a metal fitting formed by bending a metal plate having a spring action similarly to the above, and its base end is fixed by a bolt (barrier 30) provided at the mismatch position Y. A substantially strip-shaped spring piece 54 is formed to extend from the base end to the other barrier 29 side, and the spring piece 54 is set so that the curvature gradually increases from the arc-shaped wall surface 31 toward the distal end, The tip of the spring piece 54 is formed as a detent part 51, and the distance between the detent part 51 and the barrier 29 is increased by the convex part 28.
The thickness of the pressure detecting hole 1 shown in FIG.
In the disagreement state between 2 and 26, the base end of the spring piece 54 is interposed in the gap between the convex portion 28 and the arc-shaped wall surface 31, and in this state, the pressure reduction mechanism unit 3 is rotated in the direction in which the pressure detection holes 12 and 26 match. During this time, the spring piece 54 is pressed along the peripheral surface of the arc-shaped wall surface 31 by the convex portion 28, and in the matching state of the pressure detection holes 12 and 26 shown in FIG. Because of the separation, the pressing state of the spring piece 54 by the convex portion 28 is released, and the spring piece 54 is repelled by its elasticity, so that the rotation preventing portion 51 is positioned on the rotation orbit of the convex portion 28 and the decompression mechanism unit 3 Are prevented from rotating to the mismatch position Y. In addition, the pointer 52 bent upward from the base end is arranged on the joint surface 14a so as not to interfere with the joint bolt V, and an appropriate display indicating the matching state and the mismatch state of the pressure detection holes 12, 26 on the joint surface 14a. Five
3, 53a (in the illustrated example, the same notation as described above) is applied to form the index means 49.

Next, a third example of the rotation control means 48 will be described with reference to FIGS.
It will be described based on. FIG. 22 is a front view of the pressure reducing valve in which the pressure detection holes 12 and 26 match, FIG. 23 is a left side view of FIG. 22, and FIG.
FIG. 25 is a cross-sectional view showing a state where the pressure detection holes 12 and 26 do not match. This rotation control means 48 is a modification of the second example, and the same or corresponding parts as those of the second example are denoted by the same reference numerals and description thereof will be omitted. In particular, since the index means 49 is the same as that of the second example, a plan view (same as FIG. 20) of the pressure reducing valve is omitted in the third example. The third example is different from the second example in the shape of the spring piece 54. Therefore, only the spring piece 54 will be described below. The spring piece 54 is formed in the shape of a chevron with the base end side bulging outward.
The inclined part 56 toward the side is continuously formed, and the tip is a barrier.
The rotation preventing portion 51 is formed to bend substantially in parallel with the rotation preventing portion 29, and the interval between the rotation preventing portion 51 and the barrier 29 is substantially equal to the thickness of the convex portion 28. Then, in a state where the pressure detecting holes 12 and 26 do not match as shown in FIG. 25, the convex portion 28 is arranged inside the crest 55 of the spring piece 54, and in this state, the pressure reducing mechanism unit 3 matches the pressure detecting holes 12 and 26. During the rotation in the direction of rotation, the outside of the convex portion 28 slides while pressing the inclined portion 56 of the spring piece 54 outward, and when the pressure detecting holes 12, 26 shown in FIG. Part 28 is a spring piece
Since the projection is separated from the leading end, the pressing state of the spring piece 54 by the projection 28 is released, the spring piece 54 is elastically restored, and the detent part 51 is located on the trajectory of the projection 28, and the pressure reducing mechanism unit 3 does not match. The rotation to the position Y is prevented.

[0023]

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 35 is opened by closing the valve 12 with the partition wall 24 of the pressure control chamber 18 and connecting the pressure detection hole 26 of the pressure control chamber 18 to the outside, thereby opening the primary pressure chamber 6 and the secondary pressure. 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. Also, at the position where the pressure detection holes 12 and 26 do not coincide with each other, a protruding piece 40 protruding outward in one diameter direction of the back of the valve body 35,
Since the valve 40a is opposed to the valve-closing preventing pieces 41, 41a arranged only in front of the movement path in the valve-closing direction, the primary pressure increases during the water leakage test, and the piston 37 moves in the valve-closing direction in the valve-closing direction. Even when the pressing force is applied, the protruding pieces 40, 40a are hooked on the valve closing prevention pieces 41, 41a to maintain the valve open state, so that water can be continued without any trouble,
It is possible to prevent a problem that the valve body 35 closes without permission during the water leakage test and water cannot be passed.

According to the second aspect of the present invention, the convex portion 28 is provided outside the pressure reducing mechanism unit 3, and the pressure detecting holes 12 and 26 coincide with each other on the rotational orbit of the convex portion 28. Since the barriers 29 and 30 for stopping the projections 28 at the matching and mismatching positions X and Y corresponding to the
By rotating the pressure reducing mechanism unit 3 until the pressure reducing mechanism unit 3 is hit by the barrier 29 at the matching position X, the pressure reducing function can be made effective. Conversely, the convex portion 28 is stopped by the barrier 30 at the mismatching position Y. If the pressure reducing mechanism unit 3 is rotated up to this point, the pressure reducing function can be invalidated, so that the presence or absence of the pressure reducing function can be grasped only by the touch when the pressure reducing mechanism unit 3 is operated, and the switching operation can be easily performed. it can.

According to the third aspect of the present invention, the valve body 2 and the pressure reducing mechanism unit 3 are provided with the engagement main bodies 10 and 10a and the engagement subordinate parts 2 respectively.
7 and 27a are provided, and the engagement main body portions 10 and 10a and the engagement subordinate portions 27 and 27a are formed by engaging the pressure reducing mechanism unit 3 with the valve box 2 in a rotatable state so as not to come off. , When rotating the pressure reducing mechanism unit 3, etc.
The decompression mechanism unit 3 can be rotated with a stable rotation trajectory without a problem that the decompression mechanism unit 3 is detached from the valve or that the decompression mechanism unit 3 rotates in a state of being lifted from the valve box 2.

According to the fourth aspect of the present invention, since the indicator means 49 is provided outside the pressure reducing valve 1 for indicating whether the pressure detection holes 12 and 26 match or not, when the pressure reducing mechanism unit 3 is rotated, a convex portion is provided. Since it is possible to visually check whether the portion 28 has hit the barrier 29 at the coincidence position X or the protrusion 28 has hit the barrier 30 at the mismatch position Y, the pressure reducing valve 1 is in one of the two states. Incorrect operation is eliminated.

According to the fifth aspect of the present invention, when the pressure reducing mechanism unit 3 is rotated from the mismatched state of each of the pressure detecting holes 12 and 26 to the matched state, the rotation control means 48 for suppressing the rotational movement to the mismatched state. Therefore, the pressure reducing valve 1 is piped with the pressure reducing function disabled, and after the water leakage test, the pressure reducing mechanism unit 3 is once rotated in a rotatable direction until the projection 28 hits the barrier 29 at the matching position X. If the decompression function is enabled, the position of the decompression mechanism unit 3 is forcibly held by the rotation control means 48, and the decompression function unit can be maintained in an effective state. Thus, it is possible to easily grasp the presence or absence of the decompression function, and to improve the reliability of the switching operation without erroneous switching operation.

[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 sectional view of a main part taken along line XX of FIG. 1;

FIG. 5 is a plan view of a valve box.

FIG. 6 is a longitudinal sectional view of a valve box.

FIG. 7 is a cross-sectional view of the valve box.

FIG. 8 is a longitudinal sectional view of the pressure reducing valve when the pressure reducing function is released.

FIG. 9 is a sectional view taken along the line AA of FIG. 8;

FIG. 10 is a sectional view of a main part taken along line XX of FIG. 8;

FIG. 11 is a longitudinal sectional view of the pressure reducing valve when the pressure reducing mechanism unit is detached.

FIG. 12 is a sectional view taken along the line AA of FIG. 11;

FIG. 13 is a front view of the pressure reducing valve in a state in which the first rotation control means is attached and the pressure reducing function is released.

FIG. 14 is a plan view of FIG.

FIG. 15 is a front view of the pressure reducing valve in a state where the pressure reducing function is operated.

FIG. 16 is a plan view of FIG.

FIG. 17 is a front view of the pressure reducing valve in a state where the second rotation control means is attached and a pressure reducing function is operated.

18 is a left side view of FIG.

FIG. 19 is a sectional view taken along the line CC of FIG. 18;

FIG. 20 is a plan view of FIG. 17;

FIG. 21 is a cross-sectional view showing a state where a pressure reducing function is released.

FIG. 22 is a front view of the pressure reducing valve in a state where a third rotation control means is attached and a pressure reducing function is operated.

FIG. 23 is a left side view of FIG. 22.

24 is a sectional view taken along the line DD in FIG.

FIG. 25 is a cross-sectional view in a state where a pressure reducing function is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 2 Valve box 3 Pressure reducing mechanism unit 4 Inflow port 5 Discharge port 6 Primary pressure chamber 7 Secondary pressure chamber 8 Intermediate chamber 9 Loading port 10, 10a Engagement main part 11 Partition wall 12 Pressure detection hole 18 Pressure adjustment Chamber 19 Pressure adjusting means 24 Partition wall 25 Rotary shaft 26 Pressure detection hole 27, 27a Engagement subordinate part 28 Convex part 29 Barrier 30 Barrier 32 Communication passage 34 Valve port 34a Valve seat 35 Valve body 36 Valve rod 37 Piston 40, 40a Projection Pieces 41, 41a Valve closing prevention piece 48 Rotation control means 49 Index means X Match position Y Mismatch position

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Hiroyuki Mizuno 955--5, Miyamae, Irika-de-Nitta, Komaki, Komaki-shi, Aichi F-term in the Yoshitake Komaki Plant (reference) 3H051 AA01 BB03 CC11 CC12 CC14 FF02 3H060 AA01 BB01 BB03 CC33 DC05 DD04 DD17 EE06 HH03 HH14 5H316 AA07 BB08 DD06 DD15 EE02 EE10 EE12 FF36 GG01 JJ01 JJ13 KK02 LL10

Claims (5)

[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 is provided at the predetermined rotation position of the pressure reducing mechanism unit with respect to the valve box to communicate the two chambers.
The pressure detection hole of the secondary pressure chamber is closed by the partition of the pressure adjustment chamber, and the pressure detection hole of the pressure adjustment chamber is communicated to the outside,
A pressure reducing valve characterized in that a protruding piece projecting outward in one diameter direction of a back portion of a valve body is opposed to a valve closing prevention piece disposed only in front of a moving path in a valve closing direction. 2. A barrier for providing a convex portion outside the pressure reducing mechanism unit, and for abutting the convex portion on a rotational orbit of the convex portion at a position corresponding to a matching state and a mismatching state of each pressure detection hole. The pressure reducing valve according to claim 1, further comprising: 3. A valve box and a decompression mechanism unit each having an engagement main body portion and an engagement subordinate portion, and the engagement main body portion and the engagement subordinate portion are capable of rotating the pressure reduction mechanism unit with respect to the valve box. The pressure reducing valve according to claim 1, wherein the pressure reducing valve is engaged in a retaining state in a state. 4. The pressure reducing valve according to claim 1, wherein indicator means for indicating whether the pressure detection holes match or not match are provided outside the pressure reducing valve. 5. The apparatus according to claim 1, further comprising rotation control means for suppressing rotation of said pressure detecting holes from said mismatched state to said matched state when said pressure reducing mechanism unit is rotated. 5. The pressure reducing valve according to 3 or 4.