JP5006701B2 - Pressure reducing valve - Google Patents

Description

  The present invention relates to a pressure reducing valve for door-to-door water supply installed in the middle of a water pipe.

  The pressure reducing valve for water supply for each door is attached to an appropriate place in the middle of water pipes such as apartment buildings, and opens and closes the valve body according to the pressure on the secondary side so that the pressure on the secondary side is reduced to a predetermined value or less. Is. In general, this type of pressure reducing valve is designed to reduce the primary pressure of about 0.07 to 1.0 MPa to the secondary pressure of about 0.05 to 0.30 MPa.

  By the way, when the construction of the door-to-door piping for the apartment house or the like is completed, a water pressure inspection is performed to inspect the presence or absence of water leakage at each part by applying a predetermined pressure to the entire piping. In this water pressure inspection, the primary pressure is about 1.75 MPa, and if there is a pressure reducing valve in the pipe, an excessive pressure load is applied to the secondary side of the pressure reducing valve, which may damage the pressure reducing valve. In addition, when the pressure reducing mechanism of the pressure reducing valve is effectively operated during the water pressure inspection, the secondary side pressure is lowered, so that there is a problem that the water pressure inspection at a predetermined pressure cannot be performed.

  Therefore, conventionally, when the lid of the pressure reducing valve is formed in a concave shape in cross section and the concave surface of the lid is applied facing the pressure reducing valve, the pressure reducing function works effectively, while the lid is turned upside down. There has been proposed a pressure reducing valve in which the reversing surface presses the valve rod inside the pressure reducing valve when the lid is closed, and the valve closing operation accompanying the increase in the secondary pressure can be regulated (for example, Patent Document 1). According to this pressure reducing valve, it can be set so that the pressure reducing function of the pressure reducing valve does not work temporarily by turning the lid upside down and applying the lid during the water pressure inspection, and the pressure reducing valve can be prevented from being damaged during the water pressure inspection. At the same time, a decrease in the secondary pressure can be prevented. When the water pressure inspection is completed, the pressure reducing function of the pressure reducing valve can be effectively functioned by turning the lid upside down again and applying the lid.

JP 2003-131742 A

  However, in the pressure reducing valve of Patent Document 1, it is necessary to turn the lid upside down at the time of the water pressure inspection, and when the water pressure inspection is finished, it is necessary to turn the lid upside down again and apply the lid. It takes time and effort. In particular, many lids are screwed onto the pressure reducing valve to apply the lid, and it takes time to remove the lid during the upside down operation. Such a problem becomes prominent particularly when there are a large number of houses such as an apartment house, and it takes a long time to turn the lid upside down before and after the water pressure test, which causes a reduction in work efficiency.

  The present invention has been made for the purpose of solving the above-mentioned conventional problems, and the decompression function of the decompression valve can be disabled or enabled by a simple operation without removing the lid. Thus, a pressure reducing valve capable of improving the working efficiency before and after the water pressure test is provided.

  In order to achieve the above object, the present invention adopts as a solution means a valve rod that supports the valve body, a diaphragm that is connected to the valve rod and is displaced in accordance with pressure fluctuations in the secondary pressure chamber, An adjustment spring that urges the diaphragm in the valve opening direction, and the diaphragm moves the valve body in the valve closing direction against the urging force of the adjustment spring as the pressure in the secondary pressure chamber increases. A pressure reducing valve for reducing the pressure in the secondary side pressure chamber, wherein the valve stem is interlocked with the diaphragm and has a shaft portion extending on the opposite side to the valve body, and is coaxial with the shaft portion. A push rod provided on the push rod, an operation portion provided at the tip of the push rod, a spring for biasing the push rod in a direction away from the shaft portion, and the push rod against the spring via the operation portion. Holding to hold the push rod in the pushed state And a stage, in a state pushing the push bar, the lower end of the push rod comes into contact with the top of the shaft portion lies in that the structure for regulating the displacement in the closing direction of the valve stem. With such a configuration, the displacement of the valve rod in the valve closing direction is restricted and the pressure reducing function by the pressure reducing valve does not work just by pushing the operating portion provided on the push rod coaxial with the shaft portion and holding it by the holding means. .

  It is preferable that such a pressure reducing valve further includes a spring cover that surrounds the adjustment spring and a lid that closes the upper end opening of the spring cover, and the holding means is provided in the lid.

  Further, the present invention adopts as a solution means a diaphragm which is connected to the valve body via a valve rod and which is displaced in accordance with pressure fluctuations in the secondary pressure chamber, and an adjustment which urges the diaphragm in the valve opening direction. A spring, a spring cover provided so as to surround the adjustment spring, an adjustment screw screwed up and down in the spring cover so as to press the adjustment spring in the valve opening direction, and the adjustment screw above the adjustment screw A lid that closes the upper end opening of the spring cover, and the diaphragm moves the valve body in the valve closing direction against the biasing force of the adjustment spring as the pressure in the secondary pressure chamber rises. A pressure reducing valve for reducing the pressure in the secondary side pressure chamber, wherein the valve stem has a shaft portion that penetrates the diaphragm and extends through the adjusting screw to a position near the lid. The lid is A lid main body fixed to the upper end of the spring cover; a push rod penetrating the lid main body and provided coaxially with the shaft portion; an operation portion provided at the upper end of the push rod; and the push rod from the shaft portion. A spring urging in a separating direction, and holding means for holding the push bar in a state where the push bar is pushed against the spring via the operation unit, the push bar being moved by the holding means. When held in a pushed state, the lower end portion of the push rod is in contact with the top portion of the shaft portion to restrict the displacement of the valve rod in the valve closing direction. With such a configuration, the displacement of the valve rod in the valve closing direction is restricted only by pushing the operating portion provided on the lid and holding it by the holding means, and the pressure reducing function by the pressure reducing valve does not work.

  In the above configuration, the holding means may include an engaging member provided at a lower end of the push rod so as to be orthogonal to the push rod, and a support portion having a step formed around the push rod on the lower surface of the lid. preferable. In this case, when the operation portion provided on the lid is pushed in and rotated, the engaging member provided at the lower end of the push rod is supported by the support portion having a step, and the push rod is held in the pushed state.

  Moreover, in the said structure, it is preferable to set it as the structure provided in the circumference | surroundings of the said support part with the rotation control wall which contacts the said engaging member when a push rod rotates. In this case, the rotation restricting wall can prevent the push rod from rotating without being pushed in.

  In the above configuration, the lid body preferably includes a detachable stopper between the lid main body and the operation portion, and the stopper prohibits the pushing operation of the push rod. In this case, by installing a stopper between the lid body of the lid body and the operation portion after the water pressure test, it is possible to prevent the pressure reducing function of the pressure reducing valve from acting due to an erroneous operation of the operation portion.

  Moreover, in the said structure, it is preferable that the said cover main body is provided with the 1st annular packing which seals between the said spring covers, and the 2nd annular packing which seals between the said push rods. In this case, the lid can close the inside of the spring cover in a watertight manner.

  According to the pressure reducing valve of the present invention, the valve rod has a shaft portion that penetrates the diaphragm and extends to the opposite side of the valve body, and the push rod is spring-loaded through the operation portion provided at the tip of the push rod. By pushing against this, the push bar can be held in a state of being pushed by the holding means. At this time, the lower end portion of the push rod abuts on the top portion of the shaft portion and restricts the displacement of the valve rod in the valve closing direction, so that the valve rod can be closed only by pushing the operation portion and holding it by the holding means. The displacement in the direction is restricted, and the pressure reducing function by the pressure reducing valve does not work. Therefore, in the water pressure inspection, the pressure reducing function of the pressure reducing valve can be easily disabled by pushing the operating part of the lid and holding it on the holding means. In addition, the operability is improved.

  Further, according to the present invention, the valve rod has a shaft portion that penetrates the diaphragm, extends through the adjusting screw to a position near the lid, and the push rod is inserted through the operation portion provided on the lid. By pushing against the spring, the push bar can be held in a state of being pushed by the holding means. At this time, since the lower end portion of the push rod abuts on the top portion of the shaft portion and restricts the displacement of the valve rod in the valve closing direction, the operation portion provided on the lid is pushed and operated and held by the holding means. Displacement of the valve stem in the valve closing direction is restricted, and the pressure reducing function by the pressure reducing valve does not work. Therefore, in the water pressure inspection, the pressure reducing function of the pressure reducing valve can be easily disabled by pushing the operating part of the lid and holding it on the holding means. In addition, the operability is improved.

  Further, the holding means comprises an engaging member provided at the lower end of the push rod so as to be orthogonal to the push rod, and a support portion having a step formed around the push rod on the lower surface of the lid body, thereby providing an operation provided on the lid body. When the portion is pushed in and rotated, the engaging member provided at the lower end of the push rod is supported by the support portion having a step, and the push rod is held in the pushed state. Therefore, in the water pressure inspection, the pressure reducing function of the pressure reducing valve can be disabled by simply pushing and rotating the operation part of the lid, and the operability is improved.

  Further, by providing a rotation restricting wall that comes into contact with the engaging member when the push rod rotates around the support portion, the push rod can be prevented from rotating without being pushed in. Therefore, the state where the pressure reducing function of the pressure reducing valve does not act can be stabilized.

  In addition, when the lid has a detachable stopper between the lid main body and the operation unit, and the stopper prohibits the pushing operation of the push rod, the stopper is attached to the lid main body and the operation unit after the water pressure test. By mounting between them, it is possible to prevent the pressure reducing function of the pressure reducing valve from being deactivated due to an erroneous operation of the operation unit or the like.

  In the case where the lid body includes a first annular packing that seals between the spring cover and the second annular packing that seals between the push rods, the lid closes the inside of the spring cover in a watertight manner. Therefore, even if the diaphragm is broken during use of the pressure reducing valve, even if water in the secondary side pressure chamber enters the spring cover, the structure can be configured such that water does not leak outside from the spring cover.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 are views showing a pressure reducing valve 1 according to an embodiment of the present invention. This pressure reducing valve 1 is integrally assembled with a valve unit 4 in which a primary pressure chamber 2 and a secondary pressure chamber 3 are provided, and the valve unit 4, and responds to pressure fluctuations in the secondary pressure chamber 3. The pressure reducing mechanism 6 for adjusting the valve opening degree of the valve body 5 is provided.

  In the center of the valve unit 4, there is provided a partition wall 7 that divides the primary side pressure chamber 2 and the secondary side pressure chamber 3 into upper and lower sides, and a valve port 8 that is opened and closed by the valve body 5 is provided in the partition wall 7. The primary-side pressure chamber 2 and the secondary-side pressure chamber 3 that are partitioned vertically through the valve port 8 communicate with each other. The valve body 5 is supported below the valve port 8 by the valve rod 9, and the valve opening degree of the valve port 8 is adjusted by the vertical movement of the valve rod 9. An inlet 10 is provided on the side of the primary pressure chamber 2, and an outlet 11 is provided on the side of the secondary pressure chamber 3. A strainer 12 is provided inside the primary pressure chamber 2 so that fine dust and the like can be removed from the strainer 12. In the water flow state, water flowing in from the inlet 10 passes through the strainer 11 in the primary pressure chamber 2, then flows into the secondary pressure chamber 3 from the valve port 8, and flows out from the outlet 10 to the downstream piping. It has become.

  The upper part of the valve unit 4 has a concave portion 13 formed in an approximately circular shape, and the concave portion 13 communicates with the secondary pressure chamber 3. And the pressure-reduction mechanism part 6 is assembled | attached with respect to the upper part of the valve unit 4 in which the recessed part 13 was provided.

  The pressure reducing mechanism 6 is connected to the valve body 5 via a valve rod 9, and a diaphragm 14 that is displaced according to the pressure fluctuation in the secondary side pressure chamber 3, and an adjustment spring 15 that biases the diaphragm 14 in the valve opening direction. A spring cover 16 fixed to the upper part of the valve unit 4 so as to surround the adjustment spring 15, and an adjustment screw 17 screwed in the spring cover 16 so as to be movable up and down so as to press the adjustment spring 15 in the valve opening direction, A lid 18 that closes the upper end opening 16a of the spring cover 16 above the adjustment screw 17 is provided. The diaphragm 14 is composed of a substantially circular rubber plate or the like, and its peripheral portion is watertight in a state of being sandwiched between the peripheral wall 13a of the concave portion 13 provided at the top of the valve unit 4 and the peripheral portion 16b of the spring cover 16. It is fixed. The adjustment spring 15 is compressed and interposed between a nut 20 and an adjustment screw 17 for fixing a diaphragm pressing plate 19 joined to the upper surface of the diaphragm 14. The adjustment screw 17 is formed of a disk-shaped member, and a male screw that is screwed with a female screw formed on the inner surface of the cylindrical portion 16c above the spring cover 16 is formed on the peripheral side surface thereof, and the adjustment screw 17 is rotated on the upper surface. A protrusion 17a is provided. A through hole 17 b is provided at the center of the adjusting screw 17. By moving the adjustment screw 17 up and down within the cylindrical portion 16a of the spring cover 16, the elastic force of the adjustment spring 15 is adjusted, and the displacement of the diaphragm 14 below is adjusted.

  In the recess 13 provided in the upper part of the valve unit 4, a cylindrical opening 21 is provided in the center corresponding to the valve port 8, and this cylindrical opening 21 communicates with the primary pressure chamber 2. . The valve stem 9 inserted through the valve port 8 is inserted into the cylindrical opening 21, and the portion corresponding to the cylindrical opening 21 of the valve stem 9 is joined to the inner surface of the cylindrical opening 21 in a watertight manner. And the sliding member 9a which slides up and down inside the cylindrical opening part 21 is provided. The lower part of the valve stem 9 is inserted from the primary pressure chamber 2 into the secondary pressure chamber 3 through the valve port 8. The upper part of the valve stem 9 passes through the central part of the diaphragm 14. A nut 22 to be joined to the lower surface of the diaphragm 14 is screwed and fastened to the lower portion of the diaphragm 14 of the valve stem 9, and the nut 20 described above for fixing the diaphragm pressing plate 19 is screwed to the upper portion of the diaphragm 14. It is fastened. The diaphragm 14 is connected to the valve stem 9 by these nuts 22 and 20. The upper surface of the nut 22 is joined in a watertight manner to the lower surface of the diaphragm 14, and the lower surface of the diaphragm holding plate 10 is joined in a watertight manner to the upper surface of the diaphragm 14, so that the valve rod 9 penetrates the diaphragm 14. The structure is such that no water leaks from the center. The nut 22 to be joined to the lower surface of the diaphragm 14 is formed to have a larger diameter than the opening diameter of the cylindrical opening 21, and the nut 22 is seated on the periphery of the opening 21 with the diaphragm 14 being displaced to the lowest limit. Thus, the valve body 5 is further restricted from moving in the valve opening direction. The valve body 5 is provided at the lower end of the valve rod 9 inserted through the valve port 8 so as to receive the primary pressure in the valve opening direction, and is in contact with the valve seat 23 provided at the lower peripheral edge of the valve port 8. It is configured to be separable.

  A shaft portion 25 extending to a position near the lid 18 that closes the upper end opening 16 d of the spring cover 16 is provided at the upper end portion of the valve rod 9 that penetrates the diaphragm 14, and this shaft portion 25 is attached to the adjustment screw 17. It penetrates through the provided through hole 17b. The shaft portion 25 may be formed integrally with the valve stem 9 or may be structured to be connected to the upper end portion of the valve stem 9 by screw connection or the like.

  When the pressure in the secondary pressure chamber 3 increases in the water flow state, the pressure reducing valve 1 configured as described above also increases the water pressure in the recess 13 and pushes up the diaphragm 14 against the biasing force of the adjustment spring 15. When the diaphragm 14 is pushed up, the valve rod 9 works in conjunction with this to move the valve body 5 in the valve closing direction and to reduce the secondary pressure (see FIG. 2). As the secondary pressure decreases, the force that pushes up the diaphragm 14 decreases, and the diaphragm 14 is pushed down by the biasing force of the adjustment spring 15. When the diaphragm 14 is pushed down, the valve stem 9 is interlocked with this to move the valve body 5 in the valve opening direction and suppress further decrease in the secondary pressure (see FIG. 1).

  The shaft portion 25 provided on the upper portion of the valve stem 9 is interlocked with the vertical movement of the valve stem 9 in a water passage state, and the height position of the top portion 26 is also displaced. For example, when the pressure in the secondary pressure chamber 3 rises in the water flow state, the diaphragm 14 is pushed up and the valve stem 9 is interlocked with this, so that the top portion 26 of the shaft portion 25 also moves upward (see FIG. 2). When the water pressure inspection is performed in such a state, an excessive pressure load is applied to the diaphragm 14, and the pressure reducing valve may be damaged as described above, and the pressure reducing mechanism acts to lower the secondary side pressure, There is a possibility that the water pressure inspection at the predetermined pressure cannot be performed.

  Therefore, as shown in FIG. 3, the pressure reducing valve 1 contacts the top portion 26 of the shaft portion 25 against the lid body 18 that closes the upper end opening 16 a of the spring cover 16, and presses the shaft portion 25, thereby Is provided with a regulating means 18a for regulating the pressure reducing function of the pressure reducing valve 1 by restricting the displacement of the valve in the valve closing direction, and the regulating means 18a suppresses an excessive pressure load on the diaphragm 14 during the water pressure inspection. The pressure reducing valve 1 is prevented from being damaged. The lid 18 is fixed to the upper end opening 16 a of the spring cover 16, and a lid body 27 having a through hole 27 a formed at the center thereof, and a push rod inserted through the through hole 27 a of the lid body 27 and coaxial with the shaft portion 25. 28, an operation portion 29 provided at the upper end of the push rod 28, a spring 30 that urges the push rod 28 in a direction away from the shaft portion 25, and the push rod 28 against the spring 30 via the operation portion 29. And holding means 31 for holding the push rod 28 in the pushed state.

  4, 5, and 6 are views showing the lid 18. The lid main body 27 seals between the spring cover 16 by joining the female screw 27b screwed to the female screw formed on the inner surface of the cylindrical portion 16c of the spring cover 16 and the peripheral edge of the upper end opening 16a of the spring cover 16 in a watertight manner. The first annular packing 27c is provided, the upper portion of the first annular packing 27c is protruded outward and joined to the upper end edge of the spring cover 16, whereby the screwing of the male screw 27b is restricted, and the lid 18 is moved to the spring cover. 16 can be fixed. A cylindrical portion 27d is provided in the upper center of the lid body 27, and the through hole 27a is formed through the cylindrical portion 27d. A second annular packing 27 e is provided inside the through hole 27 a of the lid body 27.

  The push rod 28 is inserted through the through hole 27a of the lid body 27 so as to be slidable and rotatable up and down, and the push rod 28 and the lid body 27 are sealed in a watertight manner by a second annular packing 27c. The upper portion of the push rod 28 protrudes from the lid main body 27 and is provided by screwing the operation portion 29 to the tip thereof. The operation portion 29 is configured such that a circular member having a concave cross section is inverted and attached to the tip of the push rod 28, and a spring 30 is compression-mounted in a concave space inside thereof. One end of the spring 30 is provided inside the cylindrical portion 27d of the lid body 27, and the other end is provided in the concave space of the operation portion 29, and urges the operation portion 29 and the push rod 28 upward. The inner diameter of the concave space of the operation portion 29 is formed larger than the outer diameter of the cylindrical portion 27e of the lid body 27. The holding means 31 includes an engaging member 32 attached to the lower end of the push rod 28 so as to be orthogonal to the push rod 28, and a support portion 33 having a step formed around the through hole 27 a on the lower surface of the lid main body 27. The engaging member 32 has a protruding piece 32 a that protrudes outward from the diameter of the through hole 27 a of the lid body 27. The support portion 33 includes a first support portion 33a and a second support portion 33b that are formed by recessing the lower surface of the lid body 27, and the recess depths of the first support portion 33a and the second support portion 33b are set to each other. By making the depth different, a step is formed, and each of the first and second support portions 33a and 33b can accommodate the protruding piece 32a of the engaging member 32 inside thereof. In the illustrated example, the first support portion 33a is formed to be recessed deeper than the second support portion 33b, and the second support portion 33b is formed at a position rotated by 90 degrees around the through hole 27a of the lid body 27. The case is illustrated. The first and second support portions 33a and 33b that are recessed from the lower surface of the lid main body 27a have a rotation restricting wall 34 that contacts the protruding piece 32a of the engaging member 32 when the push rod 28 rotates around the first and second support portions 33a and 33b. The push restricting wall 34 prevents the push rod 28 from turning without being pushed in.

  As shown in FIG. 4A, when the engaging member 32 is engaged with the first support portion 33a, when the operating portion 29 is pushed downward against the urging force of the spring 30, FIG. Thus, the engaging member 32 at the lower end of the push rod 28 protrudes downward beyond the lower end surface of the lid main body 27 so that the shaft rod 28 can be rotated. In this state, when the operation unit 29 is rotated 90 degrees, the engaging member 32a at the lower end of the push rod 28 is rotated 90 degrees together with this. When the pushing of the operating portion 29 is released, the operating portion 29 and the push rod 28 are pushed up by the urging force of the spring 30, and the engaging member 32 is engaged with the second supporting portion 33b as shown in FIG. Held. FIG. 5 shows a state where the engaging member 32 is engaged with the first support portion 33a, and FIG. 6 shows a state where the engaging member 32 is engaged with the second support portion 33b.

  When the engaging member 32 is engaged with the first support portion 33a, the lower end portion (the engaging member 32 in this embodiment) of the push rod 28 is at a position sufficiently away from the top portion 26 of the shaft portion 25, and the diaphragm The vertical movement of the valve stem 9 due to the displacement of the valve 14 is not restricted at all, and the pressure reducing function by the pressure reducing valve 1 is effectively exhibited (see FIGS. 1 and 2). On the other hand, when the engaging member 32 is engaged with the second support portion 33 b, the push rod 28 is held in a state where it is pushed against the urging force of the spring 30. At this time, as shown in FIG. 3, the lower end portion (the engaging member 32 in this embodiment) of the push rod 28 abuts on the top portion 26 of the shaft portion 25 to restrict the displacement of the valve rod 9 in the valve closing direction. Therefore, the pressure reducing function by the pressure reducing valve 1 becomes invalid, and the valve rod 9 is not displaced even when the secondary pressure increases, and the valve port 8 is held open.

  Therefore, when the pressure reducing valve 1 according to the present embodiment is installed in the middle of the piping, when the water pressure inspection is performed after the construction, the operation portion 29 of the lid 18 is pushed downward and rotated 90 degrees, and the push rod 28 is pushed in. By keeping the pressure reducing function, the pressure reducing function of the pressure reducing valve 1 can be set so as not to act. In this state, the water pressure test can be performed, and the pressure reducing valve 1 can be prevented from being damaged during the water pressure test. Then, when the water pressure inspection is completed, the lid 18 is rotated again and the push rod 28 is pushed up, so that the pressure reducing function of the pressure reducing valve 1 can be set to work effectively. You only need to pass water. According to the pressure reducing valve 1, it is not necessary to perform a detaching operation for turning the lid upside down at the time of water pressure inspection as in the prior art. It becomes easy and efficient setting operation becomes possible. In particular, when there are a large number of houses as in an apartment house, the time required for the setting switching work of the pressure reducing valve 1 before and after the water pressure test is remarkably shortened, and the work efficiency is improved.

  The lid 18 provided on the pressure reducing valve 1 includes a first annular packing 27 c that seals between the lid body 27 and the spring cover 16, and a second annular packing 27 e that seals between the lid body 27 and the push rod 28. Since it is provided on the lid body 27, the inside of the spring cover 16 is closed in a watertight manner by the first annular packing 27c and the second annular packing 27e, and the diaphragm 14 should be damaged during use of the pressure reducing valve 1. Even if water in the secondary side pressure chamber 3 enters the spring cover 16, the water does not leak outside from the spring cover 16.

  FIGS. 7 and 8 are diagrams illustrating a configuration for preventing the operation unit 29 of the lid 18 from being erroneously operated after the water pressure test is ended and invalidating the pressure reducing function of the pressure reducing valve 1. The lid 18 includes a stopper 35 that can be attached to and detached from the cylindrical portion 27 d between the lid body 27 and the operation portion 29. As shown in FIG. 7A, the stopper 35 includes a substantially C-shaped fixing portion 36 and a handle portion 37. The inner diameter of the fixing portion 36 matches the outer diameter of the cylindrical portion 27d of the lid main body 27, and the fixing portion. The thickness (vertical dimension) of 36 is configured to match the gap width between the lid main body 27 and the operation portion 29 around the cylindrical portion 27d. 7A, the stopper 35 is inserted between the lid main body 27 and the operation portion 29 from the side of the lid 18 so that the fixed portion 36 is fitted into the cylindrical portion 27d. ) And the state shown in FIG. In this state, since the fixing portion 36 prevents the operation portion 29 from being pushed in, it is possible to prevent the operation portion 29 from being erroneously operated and the pressure reducing function of the pressure reducing valve 1 from being invalidated. Such a stopper 35 is preferably attached to the lid 18 when the pressure reducing function of the pressure reducing valve 1 is effectively set after the water pressure test is completed.

It is a figure which shows the state which has set the pressure reduction function effectively in the pressure reduction valve, and the valve body moved to the valve opening direction. It is a figure which shows the state which set the pressure reduction function in the pressure reduction valve effectively, and the valve body moved to the valve closing direction. It is a figure which shows the state which set the pressure reduction function invalid by the cover provided in the pressure reduction valve, and hold | maintained the valve body in the valve opening position. It is the perspective view which looked at the cover body from the lower part, (a) is the state which set decompression function effective, (b) is the state operated in order to switch validity / invalidity of decompression function, (c) is decompression function It is a figure which shows the state which set to invalid. It is a figure which shows the cover body which sets a decompression function effectively, (a) is the sectional drawing, (b) is the bottom view. It is a figure which shows the cover body which makes a decompression function invalid, (a) is the sectional drawing, (b) is the bottom view. It is a figure which shows the state which mounts | wears with the stopper which can be attached or detached with respect to a cover body. It is sectional drawing of the cover body equipped with the stopper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pressure reducing valve 3 Secondary side pressure chamber 5 Valve body 9 Valve rod 14 Diaphragm 15 Adjustment spring 16 Spring cover 17 Adjustment screw 18 Cover body 25 Shaft part 26 Top part 27 Cover body 27c 1st annular packing 27e 2nd annular packing 28 Push rod 29 Operation Part 30 Spring 31 Holding means 32 Engaging member 33 Support part 33a First support part 33b Second support part 35 Stopper

Claims (5)

A valve stem that supports the valve body;
A diaphragm coupled to the valve stem and displaced in accordance with pressure fluctuations in the secondary pressure chamber;
An adjustment spring that biases the diaphragm in the valve opening direction ;
A spring cover surrounding the adjustment spring;
A lid for closing the upper end opening of the spring cover;
A pressure reducing valve that lowers the pressure in the secondary pressure chamber by moving the valve body in the valve closing direction against the biasing force of the adjustment spring as the pressure in the secondary pressure chamber increases. There,
The valve stem is interlocked with the diaphragm, and has a shaft portion extending on the opposite side to the valve body,
The push rod provided coaxially with the shaft portion, an operation portion provided at the tip of the push rod, a spring for biasing the push rod in a direction away from the shaft portion, and the push rod via the operation portion Holding means for holding the push rod in a state of being pushed against the spring;
The holding means includes an engaging member provided at a lower end of the push rod so as to be orthogonal to the push rod, and a support portion having a step formed around the push rod on the lower surface of the lid,
The pressure-reducing valve characterized in that, in the pushed-in state of the push rod, a lower end portion of the push rod comes into contact with a top portion of the shaft portion and restricts displacement of the valve rod in a valve closing direction. A diaphragm that is connected to the valve body via a valve rod and is displaced according to the pressure fluctuation of the secondary side pressure chamber, an adjustment spring that biases the diaphragm in the valve opening direction, and is provided so as to surround the adjustment spring A spring cover, an adjustment screw screwed into the spring cover so as to move up and down so as to press the adjustment spring in the valve opening direction, and a lid body that closes the upper end opening of the spring cover above the adjustment screw. Pressure reducing the pressure of the secondary pressure chamber by the diaphragm moving the valve body in the valve closing direction against the urging force of the adjustment spring as the pressure of the secondary pressure chamber increases A valve,
The valve stem has a shaft portion that extends through the diaphragm and extends through the adjusting screw to a position near the lid,
The lid includes a lid main body fixed to an upper end portion of the spring cover, a push bar penetrating the lid main body and provided coaxially with the shaft portion, an operation portion provided at an upper end of the push rod, and the push rod And a holding means for holding the push rod in a state where the push rod is pushed against the spring via the operation portion, and
The holding means includes an engaging member provided at a lower end of the push rod so as to be orthogonal to the push rod, and a support portion having a step formed around the push rod on the lower surface of the lid,
When the push rod is held in a state where the push rod is pushed in by the holding means, the lower end portion of the push rod is brought into contact with the top portion of the shaft portion to restrict displacement of the valve rod in the valve closing direction. Pressure reducing valve. Pressure reducing valve according to claim 1 or 2, wherein the periphery, characterized in that the push rod is provided with a rotation restriction wall in contact with the engaging member when the rotation of the support portion. The lid, the comprises a removable stopper between the lid body and the operation unit, in any one of claims 1 to 3, characterized in that the stopper to prohibit the pressing operation of the push rod The pressure reducing valve as described. The said lid main body is provided with the 1st annular packing which seals between the said spring covers, and the 2nd annular packing which seals between the said push rods, The Claim 2 thru | or 4 characterized by the above-mentioned. Pressure reducing valve.

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