Valve for water pressure inspection

Abstract

To provide a valve for water pressure inspection that requires small tightening force when stopping water and can improve water cut-off performance and operability.SOLUTION: A valve 100 for water pressure inspection has a body 1 formed with a primary-side piping connection port 15a through which water flows in, a secondary-side piping connection port 17a through which water flows out, a pressure gauge connection port 13a to which a pressure gauge is connected, and a water stop valve seat 10a disposed between the primary-side piping connection port 15a and the secondary-side piping connection port 17a. The water stop valve seat 10a has a seat surface 10b formed while expanding into a funnel shape so that a valve body portion 2a provided at the tip of a plug rod 2 fits therewith. A water stop member D1 is attached to the valve body portion 2a. When the plug rod 2 is displaced in the direction of the stop valve seat 10a and comes into contact with the seat surface 10b, the water stop member D1 assumes a shape that stops water by changing from line contact to surface contact with the seat surface 10b.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water pressure inspection valve used for water pressure inspection of indoor water supply and hot water supply piping. [Background technology]

[0002] In general, indoor water supply and hot water piping is laid using plastic pipes and the like to the end faucets in the kitchen, bath, toilet, etc., and connected to branch and end joints. There are various methods for connecting plastic pipes to joints, such as a method using tools, a one-touch method that does not require tools, and an electric fusion method in which electricity is passed through the joint to integrate it with the plastic pipe. These connection methods vary in the finish of the connection depending on the skill level of the worker, and there is a risk of water leakage. Therefore, after laying the piping, it is necessary to perform a water pressure test to check for leakage from the connection between the joint and the plastic pipe.

[0003] When conducting a water pressure test, a test pump, pressure gauge, etc. are connected to the piping, water pressure is applied and maintained for a specified period of time, and then the presence or absence of water leaks is checked. When conducting water pressure tests on hot and cold water supply piping in apartment buildings and other collective housing, there are many dwelling units, and the number of tools such as test pumps that workers can use for water pressure tests is limited, which can result in long inspection times and labor-intensive inspection work.

[0004] One example of an invention that has been invented to solve these problems is the leak inspection valve described in Patent Document 1. This leak inspection valve is connected to the water meter attachment part or pipe terminal part of a meter unit used in an apartment building.

[0005] After connection, the leak test valve is designed to apply water pressure to the inside of the piping using a test pump during a water pressure test, and when the valve is closed, the test pump can be separated while maintaining the test pressure inside the piping. For this reason, the leak test valve is expected to reduce the inspection time and labor required at sites with many apartment buildings.

[0006] Furthermore, the leak inspection valve described in Patent Document 1 uses a thick gasket to prevent the gasket from coming off due to the water pressure difference between the primary and secondary sides inside the valve when it is opened. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2019-132297 A Summary of the Invention [Problem to be solved by the invention]

[0008] The leak inspection valve described in Patent Document 1 has a structure in which a tapered, thick packing is pressed against the tapered surface of the body to stop water with the surface. This requires a large tightening force, and there are problems in that the packing is easily worn down due to surface contact caused by rotation.

[0009] The present invention was created to solve such problems, and its objective is to provide a water pressure inspection valve that requires less tightening force when stopping water, and can improve water stopping performance and operability. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the present invention provides a water pressure inspection valve having a body formed with a primary side piping connection port through which water flows in, a secondary side piping connection port through which water flows out, a pressure gauge connection port to which a pressure gauge is connected, and a water stop valve seat arranged between the primary side piping connection port and the secondary side piping connection port, wherein the water stop valve seat has a seat surface formed by expanding into a funnel shape so that a valve body portion provided at the tip of a plug rod fits into it, and a water stop member is attached to the valve body portion, and when the plug rod is displaced toward the water stop valve seat and abuts against the seat surface, the water stop member changes from line contact to surface contact with the seat surface, thereby assuming a shape that stops water. Effect of the Invention

[0011] The present invention can provide a water pressure inspection valve that requires a small tightening force when stopping water flow and can improve water stopping performance and operability. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a vertical cross-sectional view of the center portion of the water pressure inspection valve according to the embodiment of the present invention, showing the valve open state. [Diagram 2] FIG. 2 is a vertical cross-sectional view of the center portion of the water pressure inspection valve showing a closed state. [Diagram 3] FIG. 2 is an enlarged cross-sectional view of a main portion showing a state when the water pressure inspection valve is open. [Figure 4] 1 is an enlarged cross-sectional view of a main portion showing a state in which the plug rod is displaced toward the water stop valve seat and the water stop member abuts against the seat surface. FIG. [Diagram 5] FIG. 2 is an enlarged cross-sectional view of a main portion showing a state in which the water pressure inspection valve is closed. [Figure 6] FIG. 4 is an enlarged plan view of a cylindrical portion of the body on which the plug rod is installed. [Figure 7] FIG. 13 is an enlarged plan view of a main portion showing the installation state of a hexagonal nut fitted into the plug rod installation side cylindrical portion of the body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] A water pressure inspection valve 100 according to an embodiment of the present invention will be described with reference to FIGS. In addition, when explaining the directions, the handle 5 side shown in Fig. 1 will be described as the top, the cap nut N2 side as the bottom, the quick joint 6 side as the right, and the connecting member 8 as the left. Also, parts with the same configuration will be given the same reference numerals and their explanation will be omitted.

[0014] <Water pressure inspection valve> The water pressure inspection valve 100 shown in Figures 1 and 2 is a valve for water pressure testing of hot and cold water supply piping connected to a water faucet at the end of an indoor kitchen, bath, toilet, etc. via a joint, etc. The water pressure inspection valve 100 comprises a body 1, a plug rod 2, a water stop member D1, O-rings O1, O2, a hexagonal nut N1, a spacer 3, a cap 4, a handle 5, a cap nut N2, C-rings R1, R2, a quick joint 6, a quick clip 7, and a connecting member 8.

[0015] <Torso> As shown in Figs. 1 and 2, the body 1 is a housing (valve body) that forms the outer case of the water stop mechanism 10. The body 1 is made of resin such as PPS (polyphenylene sulfide). The body 1 is formed with a plug rod installation side tubular portion 12 having a plug rod installation side vertical hole 11, a pressure gauge installation side tubular portion 14 having a pressure gauge installation side vertical hole 13, a primary side tubular portion 16 having a primary side horizontal hole 15, and a secondary side tubular portion 18 having a secondary side horizontal hole 17. Therefore, the body 1 is made of a hollow member formed in a substantially cross shape when viewed from the front. In the center of the body 1 formed in a substantially cross shape, a seat surface 10b of a water stop valve seat 10a against which a water stop member D1 attached to the lower part of the plug rod 2 abuts is provided.

[0016] <Vertical hole on stopper rod installation side> The plug rod installation side vertical hole 11 is a plug rod installation hole for installing the plug rod 2 so that it can move up and down and rotate freely. The plug rod installation side vertical hole 11 is formed hollow in the plug rod installation side tubular part 12 extending upward from the seat surface 10b. The plug rod installation side vertical hole 11 and the pressure gauge installation side vertical hole 13 form vertical holes extending along the vertical axis of the body 1. The plug rod installation side vertical hole 11 is formed with a valve body installation part 11a, annular body installation part 11b, and nut installation part 11c in order of smallest inner diameter from the bottom, and is formed in a stepped shape so as to gradually expand.

[0017] The valve body installation part 11a is a cylindrical part into which the valve body part 2a formed at the lower end of the plug rod 2 is inserted so as to be movable up and down and rotatable. The outer periphery of an O-ring O1 fitted in a groove on the outer surface of the valve body part 2a is arranged in contact with the inner surface of the valve body installation part 11a. An annular body installation part 11b having a larger diameter than the valve body installation part 11a is formed on the upper side of the valve body installation part 11a.

[0018] The annular body installation portion 11b is a cylindrical portion into which the flange portion 2b protruding from the periphery of the central portion of the plug rod 2 is inserted so as to be movable up and down and rotatable. A nut installation portion 11c having a larger diameter than the annular body installation portion 11b is formed on the upper side of the annular body installation portion 11b.

[0019] As shown in Fig. 1, the nut installation portion 11c is a cylindrical portion into which the hexagonal nut N1 is inserted, the hexagonal nut N1 being screwed into the male threaded portion 2c located at a position toward the upper center of the plug rod 2. As shown in Fig. 6 and Fig. 7, a nut rotation restricting portion 11d consisting of two flat surfaces that restrict rotation of the hexagonal nut N1 is formed on the inner wall of the nut installation portion 11c, which is cylindrical in plan view.

[0020] <Hexagon nut> In this way, the hexagonal nut N1 fitted inside the nut installation portion 11c is held by the nut rotation restricting portion 11d and does not rotate together with the plug rod 2 even if the plug rod 2 is moved up and down by turning the handle 5. The hexagonal nut N1 is made of the same metal as the plug rod 2, such as plated iron.

[0021] 1 and 2, a cap mounting recess 12a is formed on the outer surface of the nut installation portion 11c, into which a protrusion 4a formed on the inner peripheral surface of the cap 4 engages. The cap 4 is attached by snap fit to the upper ends of the hexagonal nut N1 and the nut installation portion 11c with a spacer 3 interposed therebetween.

[0022] <Cylindrical part on the stopper rod installation side> The plug rod installation side tubular part 12 is a generally cylindrical part having a plug rod installation side vertical hole 11 inside which the plug rod 2 is inserted so as to be movable up and down and rotatable in the axial direction. A cap attachment recess 12a with which the cap 4 engages is formed at the outer upper end of the plug rod installation side tubular part 12. The inner bottom of the cap 4 is placed on the upper end of the plug rod installation side tubular part 12 and the upper end of the hexagonal nut N1 with a spacer 3 interposed therebetween.

[0023] <Spacer> The spacer 3 is a member arranged to close the open end of the plug rod installation side tubular part 12 into which the hexagonal nut N1 is inserted. The spacer 3 is made of a circular flat washer-like member in a plan view, having a through hole in the center for loosely inserting the rod-shaped part 2f of the plug rod 2. The spacer 3 is made of resin such as high density polyethylene (HDPE).

[0024] <Cap> The cap 4 is a generally container-shaped lid member that closes the open end of the plug rod installation side tubular portion 12 via a spacer 3. The cap 4 has the above-mentioned convex portion 4a and a circular through hole 4b for loosely inserting the rod-shaped portion 2f of the plug rod 2. The cap 4 is attached to the outer periphery of the upper end portion of the plug rod installation side tubular portion 12 by engaging the convex portion 4a with the cap attachment recess 12a. The cap 4 is made of a resin such as polyacetal (POM). The through hole 4b is a circular hole formed in the center of the upper surface of the cap 4.

[0025] <Pressure gauge installation side vertical hole and pressure gauge installation side cylindrical part> As shown in Fig. 1 and Fig. 2, the pressure gauge installation side vertical hole 13 is a vertical hole having a pressure gauge connection port 13a to which a pressure gauge (not shown) such as a Bourdon tube pressure gauge for measuring the pressure inside the body 1 is connected. The pressure gauge installation side vertical hole 13 is formed hollow in a pressure gauge installation side tubular part 14 extending downward from the seat surface 10b. A nut mounting part 14a is formed on the lower outer periphery of the pressure gauge installation side tubular part 14, into which a fitting part N2b of a cap nut N2 is fitted. A ring mounting groove 14b is formed in the nut mounting part 14a for mounting a C-shaped ring R1. The pressure gauge installation side vertical hole 13 communicates with a secondary side horizontal hole 17.

[0026] <Cap nut> The cap nut N2 is a nut for mounting a pressure gauge (not shown) having a female thread portion N2a for mounting the pressure gauge in the pressure gauge mounting vertical hole 13. In the cap nut N2, a ring mounting groove N2c that matches the ring mounting groove 14b is formed on the surface facing the ring mounting groove 14b. The cap nut N2 is formed of a metal such as free-cutting brass (C3604).

[0027] <Primary side horizontal hole and primary side cylindrical part> The primary side horizontal hole 15 is a hole having a primary side pipe connection port 15a to which a pipe P1 connected to a test pump (not shown) for applying pressure inside the body 1 is attached via a quick joint 6. The primary side horizontal hole 15 is formed hollow in a primary side cylindrical part 16 extending rightward from the stop valve seat 10a. The primary side horizontal hole 15 and the secondary side horizontal hole 17 form horizontal holes extending left and right in the body 1 so as to be perpendicular to the stop rod installation side vertical hole 11 and the pressure gauge installation side vertical hole 13. The insertion part 6a of the quick joint 6 is fitted into the inner peripheral surface of the tip side of the primary side cylindrical part 16. An annular protrusion 16a for attaching a quick clip 7 is formed on the outer peripheral surface of the tip side of the primary side cylindrical part 16.

[0028] <Quick joint> The quick joint 6 is a connection member for connecting a pipe P1 consisting of a hose or the like connected to a test pump (not shown) to the primary side cylindrical portion 16. The quick joint 6 is formed with an insertion portion 6a, an O-ring installation groove 6b, an annular convex portion 6c, and a pipe connector mounting thread portion 6d. The quick joint 6 is formed from a resin such as polyphenylene sulfide (PPS).

[0029] The insertion portion 6a is a portion for inserting the quick joint 6 into the primary cylindrical portion 16. The insertion portion 6a is made of a cylindrical portion formed on the base end side of the quick joint 6. The O-ring installation groove 6b is an annular groove for installing each of the O-rings O2. The O-ring installation groove 6b is formed on the outer circumferential surface of the insertion portion 6a. The annular protrusion 6c is a location where a quick clip 7 is attached, which connects the quick joint 6 and the primary side tubular portion 16. The annular protrusion 6c is disposed adjacent to the annular protrusion 16a of the primary side tubular portion 16, and the annular protrusions 6c, 16a are attached so as to be clamped by the quick clip 7, thereby preventing the quick joint 6 from coming off the primary side tubular portion 16. The pipe connector mounting threaded portion 6d is a portion into which a threaded portion of a connecting member (not shown) for mounting the pipe P1 for connecting to a pump, which is provided at the tip end of the quick joint 6, is screwed.

[0030] <Quick Clip> As shown in Figs. 1 and 2, the quick clip 7 is a retaining member for connecting the quick joint 6 and the primary side cylindrical portion 16 by clamping the annular convex portions 6c, 16a as described above.

[0031] <Secondary side horizontal hole and secondary side piping connection port> The secondary-side horizontal hole 17 is a hole having a secondary-side pipe connection port 17a to which the secondary-side pipe P2 is connected. The secondary-side horizontal hole 17 is formed in a hollow shape within a secondary-side cylindrical portion 18 extending leftward from the water-stop valve seat 10a. The secondary-side horizontal hole 17 communicates with the pressure gauge installation side vertical hole 13. When the valve is opened, the secondary-side horizontal hole 17 communicates with the primary-side horizontal hole 15 through the pressure gauge installation side vertical hole 13. On the outer peripheral surface of the tip side of the secondary-side cylindrical portion 18, a connecting member attachment portion 18a for attaching the connecting member 8 and a ring installation groove 18b for installing a C-ring R2 in the connecting member attachment portion 18a are formed.

[0032] <Connecting member> The connecting member 8 is a nut having a female screw portion 8a for substituting a screw-type meter for pressure inspection (not shown) or for attaching a pipe terminal portion to the secondary-side cylindrical portion 18. In the connecting member 8, a ring installation groove 8b matching the ring installation groove 18b is formed on the opposing surface of the ring installation groove 18b. The connecting member 8 is formed of a metal such as free-cutting brass (C3604), similar to the cap nut N2.

[0033] <C-ring> The C-ring R1 is a member for fixing the cap nut N2 to the nut attachment portion 14a of the pressure gauge installation side cylindrical portion 14. The C-ring R2 is a member for fixing the connecting member 8 to the connecting member attachment portion 18a of the secondary-side cylindrical portion 18. The C-rings R1 and R2 are composed of rings formed in a C-shape from a metal such as brass.

[0034] ≪Water-stop mechanism≫ As shown in FIGS. 1 to 5, the water-stop mechanism 10 is a device that closes and opens by pressing or separating a water-stop member D1 provided on the valve body portion 2a of the plug rod 2 that moves up and down against a water-stop valve seat 10a provided between the primary-side horizontal hole 15 and the secondary-side horizontal hole 17. The water-stop mechanism 10 mainly consists of a plug rod installation side vertical hole 11, a pressure gauge installation side vertical hole 13, a primary-side horizontal hole 15, a secondary-side horizontal hole 17, a plug rod 2 having a valve body portion 2a, a water-stop member D1 provided on the valve body portion 2a, and a water-stop valve seat 10a having a seat surface 10b.

[0035] <Water stop valve seat> As shown in Figures 1 and 2, the stop valve seat 10a is a portion that receives the valve body portion 2a when closing the water passage port that communicates with the primary side horizontal hole 15 and the secondary side horizontal hole 17. As shown in Figures 1 and 3, the stop valve seat 10a is disposed between the primary side piping connection port 15a and the secondary side piping connection port 17a, and closes the communication hole that communicates with the primary side piping connection port 15a and the secondary side piping connection port 17a when the stop valve member D1 comes into contact with the stop valve seat 10a. The stop valve seat 10a has a seat surface 10b that is formed by expanding in a funnel shape so that the valve body portion 2a provided at the lower end of the plug rod 2 fits. When the handle 5 is rotated clockwise, the plug rod 2 in the open state shown in Fig. 1 is guided by the female threaded portion N1a of the hexagonal nut N1 into which the male threaded portion 2c is screwed, and displaces along the axis toward the stop valve seat 10a, and the water-stopping member D1 comes into contact with the seating surface 10b, as shown in Fig. 4. Furthermore, when the plug rod 2 is displaced toward the stop valve seat 10a, the water-stopping member D1 is pressed against the seating surface 10b and deformed to be slightly crushed, as shown in Figs. 2 and 5, and the valve is closed.

[0036] <Water-stopping materials> As shown in Figs. 3 to 5, the water-stopping member D1 is an annular member that stops water by changing from line contact to surface contact with the seating surface 10b when the plug rod 2 is displaced toward the water-stop valve seat 10a and abuts against the seating surface 10b. The water-stopping member D1 is made of a D-ring that is annularly formed from an elastic rubber member such as ethylene-propylene rubber (EPDM) and has a substantially D-shape in vertical cross section. The outer circumferential surface of the D-ring is formed into a curved surface that is curved in a substantially arc shape in the vertical direction. The water-stopping member D1 is disposed in a state in which the outer circumferential portion protrudes from the surface of the valve body portion 2a by engaging the inner circumferential portion with the water-stopping member installation groove 2e formed in the valve body portion 2a of the plug rod 2.

[0037] <Bung rod> As shown in Figures 1 and 2, the plug rod 2 is disposed in the plug rod installation vertical hole 11 of the body 1 so as to be movable up and down, and is a generally rod-shaped member having a valve body portion 2a at the lower end. The plug rod 2 is formed with the valve body portion 2a, a flange portion 2b, a male thread portion 2c, a pressure relief hole 2d, a water stop member installation groove 2e, a rod-shaped portion 2f, a handle installation portion 2g, and a pressure relief passage 2h. The plug rod 2 is a part that is subjected to a load by surface contact with the metal hexagonal nut N1, and is therefore formed of a metal such as free-cutting brass (C3604) so ​​that the hexagonal nut N1 and the resin body 1 engage with each other as different metals.

[0038] The valve body 2a is a portion in which the lower side is tapered to match the seat surface 10b and the upper side is formed into a columnar shape to be fitted vertically movably into the cylindrical valve body installation part 11a. A pressure relief passage 2h is formed in the center of the lower end surface of the valve body 2a, extending upward along the axis.

[0039] 3 to 5, an annular water-stopping member installation groove 2e in which a water-stopping member D1 is attached is formed on the tapered, generally conical surface of the valve body 2a. A pressure relief hole 2d communicating with the pressure relief passage 2h is formed in the upper part of the water-stopping member installation groove 2e in which the water-stopping member D1 is attached. The pressure relief passage 2h is formed so as to communicate from the pressure relief hole 2d to the pressure gauge installation vertical hole 13 on the tip face side of the valve body portion 2a. The opening of the pressure relief hole 2d is located on the opposite side to the tip of the valve body 2a. The pressure relief holes 2d penetrate from two or four places in the annular water-stopping member installation groove 2e to the opposite side of the valve body 2a via the pressure relief passage 2h on the axial line.

[0040] As shown in Figs. 1 and 2, an O-ring O1 for maintaining airtightness with the valve body installation portion 11a is provided on the outer periphery of the columnar portion of the valve body portion 2a. The O-ring O1 and the O-ring O2 are made of rubber such as nitrile rubber (NBR).

[0041] The flange portion 2b is a portion that serves as a guide for the plug rod 2 that moves up and down. The flange portion 2b is a brim-shaped portion that is circular in plan view and protrudes from the outer periphery of the central portion in the up and down direction of the plug rod 2. The flange portion 2b is disposed on the annular body installation portion 11b so as to be movable up and down and rotatable. When the handle 5 is operated in the valve closing direction, the valve body portion 2a and the flange portion 2b are displaced downward while rotating together with the plug rod 2. When the handle 5 is operated in the valve opening direction, the valve body portion 2a and the flange portion 2b are displaced upward while rotating together with the plug rod 2.

[0042] As shown in Figures 1 and 2, the male thread portion 2c is a portion that screws into the female thread portion N1a of the hexagonal nut N1 that is fitted into the nut installation portion 11c in the plug rod installation side cylindrical portion 12. The male thread portion 2c is formed continuously on the upper side of the flange portion 2b. When the handle 5 is operated in the valve closing direction, the male thread portion 2c is displaced downward while rotating within the female thread portion N1a of the hexagonal nut N1 that is screwed into it. When the handle 5 is operated in the valve opening direction, the male thread portion 2c is displaced upward while rotating within the female thread portion N1a of the hexagonal nut N1 that is screwed into it.

[0043] The rod-shaped portion 2f is a polygonal columnar portion that is loosely inserted into the through-hole 4b of the spacer 3 and the cap 4, and has a tip portion that engages with the locking hole 5b of the handle 5. The rod-shaped portion 2f is formed, for example, in a rectangular columnar shape (see FIG. 7) in a plan view in order to be connected so as to rotate integrally with the handle 5. A handle installation portion 2g is formed at the tip portion of the rod-shaped portion 2f.

[0044] The handle installation portion 2g is an installation groove that fits into the locking hole 5b of the handle 5. The handle installation portion 2g is composed of an annular groove that is formed in a quadrangular cross section at the tip of the rod-shaped portion 2f having a quadrangular prism shape. A circular retaining ring installation groove may be formed near the lower side of the handle installation portion 2g of the rod-shaped portion 2f for attaching a retaining ring (not shown) that prevents the handle 5, whose locking hole 5b is engaged with the handle installation portion 2g, from falling off from the rod-shaped portion 2f.

[0045] <Handle> The handle 5 is an operating member for moving the plug rod 2 toward the water stop valve seat 10a or away from the water stop valve seat 10a by rotating the handle 5. The handle 5 has a locking hole 5b for fixing the handle 5 to the rod-shaped portion 2f, and a cylindrical portion 5a arranged axially movably on the outer periphery of the cap 4 and formed in a hat shape (cap shape) without a brim. When the handle 5 is operated in the valve closing direction, when the cap 4 is hidden inside the handle 5, it can be confirmed that the water stop member D1 abuts against the seat surface 10b and the operation of closing the valve is completed. The handle 5 is made of resin such as polypropylene (PP).

[0046] The locking hole 5b is, for example, a substantially rectangular hole. The four sides of the square locking hole 5b are formed into elastic protruding pieces by forming cut grooves (not shown) at the four corners of the locking hole 5b, and are elastically locked to the handle installation part 2g. Therefore, the handle 5 can be firmly fixed to the plug rod 2 by pushing the locking hole 5b into the handle installation part 2g.

[0047] [Water pressure inspection of indoor water supply and hot water piping] Next, a case where a water pressure inspection of indoor cold water and hot water supply piping is performed using the water pressure inspection valve 100 according to the embodiment of the present invention will be described with reference to Figs.

[0048] When conducting a water pressure test of indoor cold water and hot water supply piping, first, a secondary side pipe P2 is connected to a secondary side pipe connection port 17a of the water pressure test valve 100 shown in Fig. 1. Next, a primary side pipe P1 extending from a test pump (not shown) is connected to a primary side pipe connection port 15a via a quick joint 6. Furthermore, a pressure gauge (not shown) is attached to the pressure gauge connection port 13a via a cap nut N2.

[0049] The water pressure inspection valve 100 is opened and inspection fluid is discharged from a test pump (not shown) into the primary side cylindrical portion 16, thereby filling the area from the primary side cylindrical portion 16 to the inside of the pipe P2 (not shown) with high-pressure inspection fluid.

[0050] After the pipe P2, which is the indoor cold water and hot water supply pipe, is filled with high-pressure test fluid, the valve is closed by rotating the handle 5 in the closing direction, and the test fluid is sealed in a high-pressure state in the secondary pipe P2.

[0051] After the test fluid is sealed under high pressure in the secondary piping P2 in this manner, the quick joint 6 and the test pump (not shown) are removed from the primary piping connection port 15a of the water pressure inspection valve 100. A bottomed cylindrical plug (not shown) for closing the primary piping connection port 15a is attached to the primary piping connection port 15a from which the quick joint 6 has been removed. Furthermore, a quick clip 7 is attached to the primary piping connection port 15a of the primary piping connection port 15a to prevent the plug (not shown) from coming off.

[0052] Then, after a predetermined time has elapsed since the test fluid was sealed in the secondary pipe P2, the pressure value in the pipe P2 is measured by a pressure gauge (not shown) attached to the pressure gauge connection port 13a. If the pressure drop value is equal to or greater than a predetermined value, it is determined that a water leak has occurred in the indoor cold water / hot water supply pipe.

[0053] The water pressure inspection valve 100 is structured so that inspection pressure can be applied with a test pump (not shown) to close the valve, and the quick joint 6 can be removed while the inspection pressure is maintained within the pipe P2, allowing the test pump to be separated and used in various locations on site in an apartment building with many units, thereby reducing inspection time and inspection work time and enabling water pressure inspections to be performed efficiently.

[0054] [Function of water pressure inspection valve] Next, the operation of the water pressure inspection valve 100 according to the embodiment of the present invention will be described with reference to FIGS.

[0055] As shown in Fig. 1, when the handle 5 of the water pressure inspection valve 100 is rotated in the valve closing direction, the male threaded portion 2c of the plug rod 2 is threadedly engaged with the female threaded portion N1a of the hexagonal nut N1, so that the valve body portion 2a of the plug rod 2 moves in the valve closing direction toward the seating surface 10b as shown in Fig. 3.

[0056] Furthermore, when the handle 5 is rotated in the direction to close the valve, the valve body 2a descends and the outer circumferential surface of the water-stopping member D1 attached to the valve body 2a comes into contact with the seating surface 10b as shown in Fig. 4. When the water-stopping member D1 comes into contact with the seating surface 10b, it comes into line contact with the seating surface 10b because the outer circumferential surface is formed in a curved shape when viewed in vertical cross section.

[0057] Furthermore, when the handle 5 is rotated in the direction to close the valve, the valve body 2a descends and the outer peripheral surface of the water-stopping member D1 of the valve body 2a presses against the seating surface 10b, as shown in Fig. 5. As a result, the outer peripheral surface of the water-stopping member D1 is deformed so as to be crushed, and comes into surface contact with the seating surface 10b to stop water flow.

[0058] 5, the valve body 2a is formed with a water-stopping member installation groove 2e for installing the water-stopping member D1, and a pressure relief hole 2d and a pressure relief passage 2h communicating with the water-stopping member installation groove 2e. Therefore, when the water pressure in the primary side horizontal hole 15 is not lowered after the end of the inspection, and the inspection pressure in the pipe P2 is released before the primary side horizontal hole 15, the water in the primary side horizontal hole 15 acts to move the water-stopping member D1 away from the upper inner wall of the water-stopping member installation groove 2e from the primary side horizontal hole 15 through the upper side of the water-stopping member D1 as shown by the arrow a. As the water-stopping member D1 moves away from the upper inner wall of the water-stopping member installation groove 2e, the water in the primary side horizontal hole 15 flows into the secondary side horizontal hole 17. In this way, the water-stopping member D1 can be prevented from coming off and becoming detached from the water-stopping member installation groove 2e.

[0059] As described above, the present invention provides a water pressure inspection valve 100 having a body 1 formed with a primary side piping connection port 15a through which water flows in, a secondary side piping connection port 17a through which water flows out, a pressure gauge connection port 13a to which a pressure gauge is connected, and a water stop valve seat 10a arranged between the primary side piping connection port 15a and the secondary side piping connection port 17a, as shown in Figures 1, 2, 4 and 5. The water stop valve seat 10a has a seat surface 10b formed by expanding into a funnel shape so that the valve body portion 2a provided at the tip of the plug rod 2 fits into it, and a water stop member D1 is attached to the valve body portion 2a. When the plug rod 2 is displaced toward the water stop valve seat 10a and abuts against the seat surface 10b, the water stop member D1 changes from line contact to surface contact with the seat surface 10b, thereby assuming a shape that stops water.

[0060] According to this configuration, when the plug rod 2 is displaced toward the stop valve seat 10a and comes into contact with the seat 10b, the water-stopping member D1 of the water pressure inspection valve 100 of the present invention stops water by changing from line contact to surface contact with the seat 10b. Therefore, the water pressure inspection valve 100 requires a small tightening force when stopping water, and can improve water-stopping ability and operability.

[0061] Moreover, the waterproof member D1 shown in Figs. 1 to 7 is made of a D-ring.

[0062] According to this configuration, the water-stopping member D1 uses a D-ring as a water-stopping packing, thereby making it possible to reduce the size of the valve body 2a. Furthermore, when the water-stopping member D1 comes into contact with the funnel-shaped seating surface 10b to close the valve, the line contact changes to a surface contact, thereby improving the water-stopping ability of the water-stopping mechanism 10 and the operability of the handle 5 for closing the valve.

[0063] As shown in Figs. 1 to 5, the plug rod 2 has a pressure relief hole 2d formed at the location where the water-stopping member D1 is attached.

[0064] According to this configuration, the water-stopping member D1 has a pressure relief hole 2d formed at the water-stopping member installation position on the plug rod 2, so that when the valve is opened, if there is a water pressure difference between the primary side and the secondary side, the water-stopping member D1 can be prevented from coming off from the installation position.

[0065] Furthermore, in the present invention, as shown in Figures 3 to 5, a water-stopping member installation groove 2e in which a water-stopping member D1 is installed is provided on the outer peripheral surface of the valve body portion 2a, and a pressure relief hole 2d is formed communicating from the tip of the valve body portion 2a to the water-stopping member installation groove 2e, and the opening of the pressure relief hole 2d formed in the water-stopping member installation groove 2e is positioned opposite the tip of the valve body portion 2a.

[0066] According to this configuration, as shown in Fig. 5, the plug rod 2 has the pressure relief hole 2d and the pressure relief passage 2h communicating with the pressure relief hole 2d, so that when there is a water pressure difference between the primary side and the secondary side when the valve is opened, the water pressure can be relieved through the pressure relief passage 2h and the pressure relief hole 2d. Therefore, the water stop member D1 can be prevented from coming off the water stop member installation groove 2e due to the application of a large water pressure.

[0067] In addition, as shown in FIG. 1 or 2, in the present invention, the body 1 has a plug rod installation side tubular portion 12 into which the plug rod 2 is inserted so as to be movable in the axial direction, and the plug rod 2 has a male threaded portion 2c into which a hexagonal nut N1 (nut) engaged with a nut installation portion 11c in the plug rod installation side tubular portion 12 is screwed, a rod-shaped portion 2f which is loosely inserted into a through hole 4b formed in the center of a cap 4 which is attached to the upper outer periphery of the plug rod installation side tubular portion 12, and a handle installation portion 2g formed at the tip of the rod-shaped portion 2f and to which a handle 5 is attached, and the handle 5 is disposed on the outer periphery of the cap 4 so as to be movable in the axial direction, and when the handle 5 is operated in the valve closing direction, the cap 4 is hidden inside the handle 5, and the water-stopping member D1 abuts against the seat surface 10b, completing the valve closing operation.

[0068] With this configuration, when the handle 5 of the water pressure inspection valve 100 is operated in the closing direction, the water pressure inspection valve 100 knows that the water stop member D1 will come into contact with the seating surface 10b and the closing operation will be completed when the cap 4 is hidden inside the handle 5. Therefore, when the water pressure inspection valve 100 is operated in the closing direction to close the valve, it knows that the valve will be in the closed state, and it is possible to prevent the handle 5 from being operated to close the valve more strongly than necessary.

[0069] [Variations] The water pressure inspection valve 100 according to this embodiment has been described in detail above with reference to Figures 1 to 7. However, the present invention is not limited to this, and can be modified as appropriate without departing from the spirit and scope of the present invention.

[0070] In the above embodiment, as shown in Figures 1 to 5, a D-ring is used as an example of the water-stopping member D1. However, the water-stopping member D1 may have any shape that stops water by changing from line contact to surface contact with the seat surface 10b, and may be an O-ring other than a D-ring.

[0071] The water pressure inspection valve 100 has been described using water from indoor water and hot water supply piping as the inspection fluid for leak inspection, but it can also be used with air, gas, or other gases instead of water. [Explanation of symbols]

[0072] 1. Torso 2 Stopper rod 2a Valve body 2b Flange part 2c Male thread 2d Pressure relief hole 2e Water-stopping material installation groove 2f Rod-shaped part 2g Handle installation area 2h Pressure relief passage 4 Cap 4b Through hole 5 Handle 10. Water-stopping mechanism 10a Water stop valve seat 10b Seat 11 Vertical hole on the stopper rod installation side 11c Nut installation part 12 Cylindrical part on the stopper rod installation side 13a Pressure gauge connection port 15a Primary piping connection port 17a Secondary piping connection port 100 Water pressure test valve D1 Water-stopping material N1 Hexagonal nut (nut) N2 Cap nut P1, P2 piping

Claims

1. A primary piping connection port into which water flows in; A secondary piping connection port through which water flows out; a pressure gauge connection port to which a pressure gauge is connected; A water stop valve seat disposed between the primary side piping connection port and the secondary side piping connection port; A water pressure inspection valve having a body formed with The water stop valve seat has a seat surface formed by expanding in a funnel shape so that the valve body portion provided at the tip of the plug rod can fit thereto, A water-stopping member is attached to the valve body portion, When the plug rod is displaced toward the water stop valve seat and comes into contact with the seat surface, the water stop member changes from line contact to surface contact with the seat surface to form a shape that stops water. Water pressure testing valve.

2. The water-stopping member is composed of a D-ring.

2. The water pressure inspection valve according to claim 1.

3. The plug rod has a pressure relief hole formed at a location where the water-stopping member is attached.

2. The water pressure inspection valve according to claim 1.

4. A water-stopping member installation groove in which the water-stopping member is installed is provided on an outer circumferential surface of the valve body portion, The pressure relief hole is formed so as to communicate from the tip end of the valve body to the water-stopping member installation groove, The opening of the pressure relief hole formed in the water-stopping member installation groove is disposed on the opposite side to the tip of the valve body portion.

4. The water pressure inspection valve according to claim 3.

5. The body has a plug rod installation side tubular portion into which the plug rod is inserted so as to be axially movable, The plug rod has a male thread portion into which a nut engaged with a nut installation portion in the plug rod installation side cylindrical portion is screwed, a rod-shaped portion that is loosely inserted into a through hole formed in a center portion of a cap that is attached to an upper outer periphery of the plug rod installation side cylindrical portion; A handle installation portion is formed at a tip end of the rod-shaped portion, and a handle is attached to the handle installation portion. The handle is disposed on the outer periphery of the cap so as to be movable in the axial direction, and when the handle is operated in a valve closing direction, the water stop member comes into contact with the seating surface and the valve closing operation is completed when the cap is hidden inside the handle.

2. The water pressure inspection valve according to claim 1.

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