JP2013040504A - Water stop valve with backflow checking function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily inspect a backflow preventing function without removing a water stop valve itself from a water supply pipeline and without using any tool.SOLUTION: A water stop valve with a backflow checking function includes: a body barrel 1 in which a stop valve chamber 1b communicating with an inflow entrance 1a, a check valve chamber 1d communicating with a water outlet 1c, and a water flow port 1e putting the stop valve chamber 1b and the check valve chamber 1d in a communication state are respectively formed; a ball 2 which is accommodated in the stop valve chamber 1b in a rotationally operable manner and in which a water passing hole 2a putting the inflow entrance 1a and the water flow port 1e in a communication state or a non-communication state is formed; a check valve 4 which is provided in the check valve chamber 1d, allows city water to flow from the water flow port 1e to the check valve chamber 1d, and prevents the city water from flowing from the check valve chamber 1d to the water flow port 1e; and a check valve checking device 6 which is provided in the body barrel 1, seals water on a primary side by rotating operation of the ball 2, and in this state, can discharge water reversely flowing from the check valve chamber 1d to the water flow port 1e to the outside when the check valve 4 does not normally function.

Description

  The present invention prevents backflow that is installed in a water supply pipeline of a directly connected water supply system (a water supply system that uses the water pressure of a water pipe) to guide tap water from a water main to a home such as a detached house or an apartment house. In connection with the improvement of the stop cock with the function, in particular, the check that can easily and easily check the backflow prevention function without removing the stop cock itself from the water supply pipe and without using a tool. It relates to a stop cock with a check function.

  In general, a water supply pipe for leading tap water to a house or the like is installed in the middle of a water supply pipe 42 branched from a water main pipe 40 through a water tap 41 with a saddle, as shown in FIG. It consists of a primary stop cock 43, a stop cock with a check valve 44, a water meter 45, and the like. Tap water in the water main 40 is supplied with a water supply pipe 42, a primary stop cock 43, and a check water with a check valve. It is led to a water tap 46 (faucet) in the building through a plug 44 and a water meter 45.

  Usually, in the water supply pipe, water pressure is applied to the main water pipe 40, the water supply pipe 42, the primary stop cock 43, the stop cock 44 with a check valve, and the tap water is supplied to the tap 46. There is no backflow from the side.

  However, in the directly connected water supply system, the water main 40 and the water tap 46 are directly connected, and if the water main 40 is damaged due to damage, replacement work, renewal work, etc., Since the tap water in the water supply pipe 42 branched from the main pipe 40 tends to flow down from the high place side to the low place side, the pressure in the water supply pipe 42 is lower than the atmospheric pressure (negative pressure state). Become.

  When the inside of the water supply pipe 42 becomes negative pressure, there is a possibility that the tap water flows backward and sucks contaminated water from the water tap 46 (faucet). For example, as shown in FIG. 6, when water is poured in a state where a hose 47 attached to a faucet 46 (faucet) is immersed in a bathtub 48, tap water that is unsanitary due to backflow due to negative pressure is generated. It may be taken into the tube 40.

Therefore, in order to solve this problem, a check valve is separately installed in the water supply pipe 42 or a stop cock 44 with a check valve is installed to prevent backflow of tap water due to negative pressure. To be done.
In particular, since the latter stop valve with check valve 44 is integrated with an on-off valve and a check valve, it can be easily attached to a water supply pipe, and the connection point is also an on-off valve and a check valve. There is an advantage that the possibility of the occurrence of water leakage is reduced as compared with the case where the water is separately attached to the water supply pipe 42. Therefore, the stop cock 44 with a check valve has been widely used in the water supply pipe line in recent years.

  Conventionally, as this kind of stop cock 44 with a check valve, for example, a stop valve 44 with a check valve disclosed in Japanese Patent Laid-Open No. 2001-020329 (Patent Document 1) is known.

  That is, as shown in FIG. 7, the stop valve with check valve 44 includes a main body body 49 having an inlet 49a, a stop cock chamber 49b, a water inlet 49c, a check valve chamber 49d, and an outlet 49e. A ball 50 is provided in the check valve chamber 49d. The ball 50 is accommodated in the stop cock chamber 49b so as to be freely rotatable and has a water passage hole 50a that allows the inlet port 49a and the water inlet port 49c to be in communication or non-communication. It is composed of a check valve 51 or the like that allows the flow of tap water from the water port 49c to the check valve chamber 49d and blocks the flow of tap water from the check valve chamber 49d to the water flow port 49c. In addition to the backflow prevention function, it has a flow rate adjustment function and an air vent function.

  Further, as shown in FIG. 7, the check valve 51 provided in the stop cock 44 has a valve seat surface 49f formed on the inner peripheral edge of the water flow port 49c on the check valve chamber 49d side, and a check valve chamber 49d. A check valve body 52 movably accommodated, a valve body packing 53 attached to the check valve body 52 and seated against and away from the valve seat surface 49f, and a back side of the check valve body 52; It consists of a spring 54 and the like that applies a back pressure to the check valve body 52 and causes the valve body packing 53 to contact the valve seat surface 49f. When tap water flows from the inlet 49a to the outlet 49e, the water inlet 49c is reached. The check valve body 52 is pushed up against the elastic force of the spring 54 by the water pressure of the tap water to open the water flow port 49c, permitting the flow of tap water from the inlet 49a side to the outlet 49e side, and When the tap water is about to flow backward, the check valve body 52 is Depressed by the elastic force of the grayed 54 closes the passage Mizuguchi 49c, so as to prevent backflow of tap water to the inlet 49a from the outlet 49e.

However, even if the check valve with the check valve 44 is used, the check valve 51 functions normally due to foreign matter such as dust on the check valve body 52, wear of the valve body packing 53, aging, etc. If it is installed in the water supply pipe 42, it cannot be confirmed whether the backflow prevention function is functioning normally.
Even if there is an abnormality in the backflow prevention function of the stop cock 44, the abnormality cannot be found until the check valve body 52 is replaced by periodic inspection or the like, and a water pollution accident (in the water supply pipe 42) There is a possibility of causing an accident in which unsanitary tap water is taken back into the water main 40 by backflow due to negative pressure.

  Thus, the conventional check valve 44 with a check valve cannot confirm whether or not the backflow prevention function is functioning normally in the state where it is installed in the water supply pipe 42, If there is an abnormality in the backflow prevention function of the faucet 44, there is a risk that the tap water will flow backward without finding any abnormality and a water pollution accident may occur. There is a problem that the check valve body 52 and the valve body packing 53 must be replaced, and the check valve function 52 cannot be confirmed, so that the normal check valve body 52 must be replaced.

JP 2001-020329 A

  The present invention has been made in view of such a problem, and the object thereof is to easily provide a backflow prevention function without removing the stop cock itself from the water supply pipe and without using a tool. An object of the present invention is to provide a stop cock with a check function that can be easily checked.

  In order to achieve the above object, the invention of claim 1 of the present invention includes a stop cock chamber communicating with an inflow port, a check valve chamber communicating with an outflow port, a stop cock chamber and a check valve chamber in a communicating state. A body cylinder formed with a water passage opening, a ball that is rotatably accommodated in a water stop cock chamber, and has a water passage hole that allows the inflow port and the water passage to be in a communication state or a non-communication state, and a check valve Provided in the chamber, allowing a flow of tap water from the water flow opening to the check valve chamber, and preventing the flow of tap water from the check valve room to the water flow opening, and provided in the body trunk, And a check valve check device that checks the check valve prevention function of the check valve. The check valve check device rotates the ball to stop the primary side, and in this state the check valve is normal. When not functioning properly, tap water that flows back from the check valve chamber to the water outlet is discharged to the outside. It is characterized in.

  According to the invention of claim 2 of the present invention, the check valve check device is formed in the main body cylinder, and the main body cylinder is formed in a branching manner and has a water discharge port communicating with the inspection room and the inspection room. A branch hole that communicates the water inlet with the inspection room, a check plug bar that is movably accommodated in the check room, opens and closes the branch hole, and a spring that biases the check plug bar away from the branch hole And the inspection plug rod can be opened and closed between a closed position for closing the branch hole and an open position for opening the branch hole, and the holding state of the inspection plug rod in the closed position. Opening / closing operation mechanism that can release the ball, rotating the ball to stop the primary side, and operating the closing operation mechanism in this state to bring the inspection plug rod in the closed position to the open position, When the valve is not functioning properly, tap water in the check valve chamber will flow backward It is characterized in that it is configured to be discharged to the outside through the branch hole, inspection chamber and water outlet.

  The invention of claim 3 of the present invention is characterized in that a water discharge port is formed upward in the inspection cylinder and a riser pipe is connected to the water discharge port.

The stop cock with a check function according to the present invention rotates the ball accommodated in the stop cock chamber of the main body trunk to stop the primary side, and in this state, the reverse valve provided in the check valve chamber of the main body trunk. Since the check valve is equipped with a check valve checker that can check the check valve prevention function by discharging tap water that flows back from the check valve chamber to the outside when the check valve is not functioning properly. Even when a stop cock with a check function is installed in the water supply line, the check valve check function can be checked by operating the check valve check device.
In addition, the check valve with the check check function of the present invention can check the check valve prevention function without using a tool by using the check valve check device, so that the check valve check function can be prevented in a short time. Can be checked.
Furthermore, since the stop cock with a check check function of the present invention includes a check valve check device that can check the check valve prevention function of the check valve, anyone can check the check valve check function. It is a simple task that can be done easily, and regular inspections can be performed frequently.
Therefore, if the stop cock with a check function of the present invention is used, effective maintenance management for preventing water pollution accidents can be performed.

  The stopcock with a check check function of the present invention is such that when the opening / closing operation mechanism of the check valve check device is operated, the inspection stopper rod in the closed position is quickly moved to the open position by the elastic force of the spring. If the check valve bites in foreign matter such as dust, tap water that has flowed back from the check valve chamber immediately passes through the branch hole, inspection chamber, and the outside from the water discharge port. Therefore, abnormalities in the check valve prevention function of the check valve can be quickly found.

  The stopcock with a check function of the present invention has a water discharge port facing upward in the inspection cylinder and a riser pipe connected to the water discharge port, so the check valve's backflow prevention function is impaired. The tap water that has flowed back from the riser pipe is discharged only when the check valve is in check, and the check valve check function can be reliably checked. In addition, the discharge of tap water can be visually confirmed reliably and satisfactorily, and an abnormality in the check valve prevention function of the check valve can be quickly found.

It is a front view of the water stop cock with a non-return check function concerning an embodiment of the invention. It is a side view of a water stop cock with a check check function. It is an enlarged vertical front view of a stop cock with a check function. It is an enlarged vertical side view of a water stop cock with a check function. It is an expanded vertical side view of the state which is checking the backflow prevention function of the water faucet with a check check function. It is the schematic of the water supply pipe line of a direct connection water supply system. It is an expansion vertical side view of the conventional stop cock with a non-return valve.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 5 show a stop cock with a check check function according to an embodiment of the present invention, and the stop cock with a check check function supplies tap water from a water main to a detached house or an apartment house. It is installed in a directly connected water supply system (such as in the middle of a water supply pipe or on the primary side of a water meter) to guide each home, etc., and replaces water meters or repairs water supply equipment such as primary stop valves It is used when the tap water must be stopped, and has a backflow prevention function, a check check function, a flow rate adjustment function, and an air vent function in addition to the water stop function.

  That is, as shown in FIGS. 3 and 4, the stop cock with the check check function is a main body body in which an inlet 1a, a stop cock chamber 1b, an outlet 1c, a check valve chamber 1d and a water outlet 1e are formed. 1, a ball 2 that is accommodated in the water stop cock chamber 1 b so as to be rotatable and formed with a water passage hole 2 a, and a ball opening / closing operation mechanism that is provided in the main body barrel 1 and is connected to the ball 2 to rotate the ball 2. 3, a check valve 4 provided in the check valve chamber 1 d for preventing the backflow of tap water, and an opening adjustment mechanism provided in the main body body 1 for adjusting the opening (opening amount) of the check valve 4. 5 and a check valve check device 6 that is provided in the main body body 1 and checks the check valve 4 function of preventing the check valve 4 from flowing back.

  Specifically, as shown in FIG. 3, the main body cylinder 1 includes an inlet 1a located on the upstream side of the water supply pipe, a stop cock chamber 1b that communicates with the inlet 1a and is open at the bottom, Formed in an outlet 1c located on the downstream side of the water supply pipe, a check valve chamber 1d communicating with the outlet 1c and opened upward, and a partition wall 1f of the stop cock chamber 1b and the check valve chamber 1d. The water faucet chamber 1b and the check valve chamber 1d are communicated with each other, and the water faucet chamber 1b is closed at the lower opening of the water faucet chamber 1b. And a lid-like packing box 8 for closing the upper opening of the check valve chamber 1d is detachably attached to the upper opening portion of the check valve chamber 1d via an O-ring 9. It is screwed on.

  An expansion joint 10 is attached to the outlet 1 c of the main body barrel 1. The expansion joint 10 includes an expansion tube 11, an expansion tube packing 12, a guide leaf 13, a fixing cap nut 14 and a tube connecting cap nut 15.

As shown in FIG. 3, the ball 2 has a water passage hole 2 a that makes the inflow port 1 a and the water passage port 1 e in a communication state or a non-communication state. It is rotatably accommodated via an annular ball sheet 16.
The ball 2 is rotated 90 ° by the ball opening / closing operation mechanism 3 so that the open / close state is switched. When the ball 2 is in the open position (position shown in FIG. 3), the water passage hole of the ball 2 2a communicates with the inlet 1a and the water passage 1e chamber, tap water entering from the inlet 1a flows into the check valve chamber 1d through the water passage hole 2a and the water passage 1e, and the ball 2 is closed. In the case of (not shown), the upstream opening of the water flow opening 1e is closed to block water flow.

As shown in FIG. 4, the ball opening / closing operation mechanism 3 is inserted into and supported by a main body barrel 1 via an O-ring 9 so as to be rotatable, and has a sub-plug bar 17 in a lateral position with a tip portion connected to a ball 2 and a main body. A sub-plug bar presser 18 that is screwed to the barrel 1 to prevent the sub-plug bar 17 from coming off, and a lever that is detachably fitted to the base end of the sub-plug bar 17 and that rotates the sub-plug bar 17 and the ball 2. The handle 19 is composed of a handle cap 20 that is detachably screwed to the auxiliary stopper bar presser 18 and prevents the lever handle 19 from coming off. By rotating the lever handle 19 by 90 °, the ball 2 is opened or opened. Switching to the closed position can be performed.
The lever handle 19 is restricted so that the rotation angle is 90 ° by a pin 17a provided on the auxiliary plug rod 17 and a notch (not shown) formed on the body barrel 1 and fitted with the pin 17a. Has been.
The lever handle 19 can be prevented from being stolen by removing it. At this time, a dust cap (not shown) is put on the auxiliary plug bar presser 18 so that dust does not enter the auxiliary plug bar 17 side.

  As shown in FIGS. 3 and 4, the check valve 4 includes a valve seat surface 1g formed on the upper surface of the partition wall 1f on the check valve chamber 1d side at the inner peripheral edge of the water flow port 1e, and a check valve chamber 1d. A bottomed cylindrical check valve body 21 made of synthetic resin that is slidably guided in the direction and is slidably guided on the inner peripheral surface of the packing box 8, and is attached to the lower surface of the check valve body 21. A synthetic rubber valve body packing 22 that contacts and separates from the surface 1g, and a back surface side (upper surface side) of the check valve body 21, and a back surface pressing force is applied to the check valve body 21 to apply the valve body packing 22. When the tap water flows from the inflow port 1a to the outflow port 1c, the check valve body 21 has an elastic force of the spring 23 due to the water pressure of the tap water reaching the water flow port 1e. The water flow hole 2a is pushed up against the flow of the water and the flow of tap water from the inlet 1a to the outlet 1c When the tap water is about to flow backward, the check valve body 21 is pushed down by the elastic force of the spring 23 to close the water inlet 1e, and the tap water from the outlet 1c to the inlet 1a flows backward. It comes to prevent.

As shown in FIGS. 3 and 4, the opening adjusting mechanism 5 is supported by a packing box 8 so as to be rotatable in a penetrating state and immovable in the axial direction, and has a male screw portion formed on the outer peripheral surface of the lower end portion. And a round handle 25 attached to the upper end portion of the stopper rod 24 and a male threaded portion of the stopper rod 24, and accommodated in the packing box 8 so as not to be rotatable and movable up and down. And a valve body presser 26 against which the check valve body 21 pushed up by water pressure comes into contact. When the plug rod 24 is rotated forward and backward by the round handle 25, the valve body presser 26 is prevented from rotating. Moves up and down.
Therefore, the opening degree adjusting mechanism 5 adjusts the opening degree (opening amount) of the check valve 4 by adjusting the vertical position of the valve body presser 26 to change the position of the check valve body 21 in the open position. It is possible to adjust the flow rate.

On the outer peripheral surface of the flange portion of the valve body presser 26, a protrusion 26a that is fitted in a vertical groove 8a formed on the inner peripheral surface of the packing box 8 and prevents the valve body presser 26 from rotating is formed.
Further, a buffer material 27 made of a synthetic resin that absorbs an impact when the check valve body 21 collides is attached to the lower surface of the flange portion of the valve body presser 26.
Furthermore, the plug bar 24 has a through-hole air vent hole 24a formed at the center thereof, so that the air in the check valve chamber 1d can be discharged to the outside. The air vent hole 24 a is closed by a handle stop screw 28 of the round handle 25.
Therefore, by removing the handle stop screw 28, the air in the check valve chamber 1d can be discharged to the outside. This air vent hole 24a is used for discharging air remaining in the water supply pipe etc. to the outside after the construction of the piping work, etc., or for attaching a pressure gauge here to measure the water pressure in the pipeline. Is also used.

  As shown in FIGS. 4 and 5, the check valve check device 6 is connected to the main body cylinder 1 in a branched manner, and has a cylindrical inspection cylinder 1 ′ having an inspection chamber 1h and a water discharge port 1i. A branch hole 1j formed in the main body cylinder 1 for communicating the water passage 1e with the inspection chamber 1h, an inspection plug rod 29 which is movably accommodated in the inspection chamber 1h and opens and closes the branch hole 1j, and an inspection plug rod 29 Is provided in the inspection barrel 1 ', and the inspection stopper rod 29 is closed to close the branch hole 1j (position shown in FIG. 4) and the branch hole 1j. An opening / closing operation mechanism 31 of the inspection plug rod 29 that can be opened and closed over an open position (the position shown in FIG. 5) that opens the door and that can release the holding state of the inspection plug rod 29 in the closed position; It consists of a riser pipe 32 connected to the water outlet 1i, and rotates the ball 2 When the tap water on the primary side is stopped and the open / close operation mechanism 31 is operated in this state to bring the inspection stopper rod 29 in the closed position to the open position, when the check valve 4 is not functioning normally, the check valve The tap water in the chamber 1d flows backward and is discharged to the outside through the water inlet 1e, the branch hole 1j, the inspection chamber 1h and the water outlet 1i.

Specifically, the inspection cylinder 1 ′ is integrally formed in a lateral attitude in the vicinity of the partition wall 1 f of the main body cylinder 1, and has a lateral attitude in which one end is opened and the inner diameter on the back side is formed to be slightly smaller. 1h, and a water discharge port 1i in an upward posture that communicates with the large-diameter portion of the inspection chamber 1h and is opened upward.
Further, the small diameter portion of the inspection chamber 1h is in communication with the water inlet 1e via the branch hole 1j.

  The inspection stopper rod 29 is formed with a retaining flange 29a on the outer peripheral surface of the intermediate portion thereof, and the inner periphery of the small diameter portion of the inspection stopper rod 29 and the inspection chamber 1h is provided on the outer peripheral surface of the tip portion. An O-ring 9 that seals between the surfaces is fitted.

  The spring 30 is interposed between the end face of the large-diameter portion of the inspection chamber 1h and the flange portion 29a of the inspection plug rod 29, and the elastic force thereof holds the inspection plug rod 29 in the closed position. When the is released, the inspection stopper rod 29 is urged in a direction away from the branch hole 1j to open the branch hole 1j.

  The opening / closing operation mechanism 31 of the inspection plug rod 29 is detachably screwed to the inner peripheral surface of the end portion of the inspection barrel 1 ′, and the inspection plug rod 29 is inserted and supported so as to be movable in the axial direction. An inspection plug bar presser 31a for holding the inspection plug bar 29 in the open position by the contact of the flange 29a of the bar 29 and a screw for removably screwing on the outer peripheral surface of the end of the inspection cylinder 1 ' The stopper rod 29 is pushed into the inspection chamber 1h against the elastic force of the spring 30, and comprises an inspection stopper rod cap 31b for holding the inspection stopper rod 29 in the closed position. The inspection stopper rod cap 31b is for inspection. When removed from the barrel 1 ′, the holding state of the inspection plug rod 29 in the closed position is released, and the inspection plug rod 29 is moved in the direction to open the branch hole 1 j by the elastic force of the spring 30. 29 is held in the open position.

  The riser pipe 32 is detachably screwed into the water discharge port 1 i of the inspection cylinder 1 ′ in a vertical orientation, and is inserted into a support piece 1 ″ formed integrally with the main body cylinder 1 so as to be inserted into a pipe fixing screw 33. It is fixed by.

  Next, the effect | action of the water stop cock with a non-return check function mentioned above is demonstrated.

  When the ball 2 is in the open position, the tap water that has entered from the inlet 1 a reaches the water inlet 1 e through the water passage hole 2 a of the ball 2, and pushes up the check valve body 21 against the elastic force of the spring 23. . As a result, the tap water on the primary side flows into the check valve chamber 1d from the water inlet 1e and is discharged from the outlet 1c to the secondary side.

  In addition, when the inflow of tap water stops or tap water tries to flow backward, the check valve body 21 is pushed by the elastic force of the spring 23 to come into contact with the valve seat surface 1g and close the water inlet 1e. To prevent backflow of tap water.

  Further, by turning the round bundle 25 to move the valve body presser 26 up and down, adjusting the vertical position of the valve body presser 26 and adjusting the opening degree (opening amount) of the check valve 4, the water flow rate can be freely adjusted. Can be adjusted.

  Moreover, since the ball 2 can be switched to the open position or the closed position by operating the lever handle 19, when the check valve body 21 or the valve body packing 22 is replaced, the water flow is stopped. Easy replacement. If the handle screw 28 is removed, the check valve chamber 1d and the outside are in communication with each other through the air vent hole 24a, so that air can be easily vented from the check valve chamber 1d and the pipe line.

  When the check valve check device 6 is used to check the backflow prevention function of the check valve 4, first, the lever handle 19 is turned 90 ° to bring the ball 2 into the closed position and the primary side is stopped. Water.

  Next, as shown in FIG. 5, the inspection stopper rod cap 31b is manually turned and removed from the inspection cylinder 1 '. Then, the inspection plug rod 29 is moved away from the branch hole 1j by the elastic force of the spring 30 to open the branch hole 1j, and the flange portion 29a formed on the outer peripheral surface thereof has an inspection plug rod presser 31a. Is held in the open position.

  At this time, if foreign matter such as dust is caught between the valve body packing 22 and the valve seat surface 1g, the tap water on the secondary side passes through the gap between the valve body packing 22 and the valve seat surface 1g. However, since the ball 2 is held in the closed position and shuts off the water inlet 1e and the inlet 1a, the back-flowed tap water enters the inspection room 1h and the riser pipe 32 from the branch hole 1j. Flowing.

If tap water overflows from the riser 32, it can be confirmed that there is an abnormality in the check flow prevention function of the check valve 4 and the tap water is flowing back.
If the check valve is confirmed, the check valve element 21 and the valve element packing 22 are replaced, the inside of the check valve chamber 1d and the like are cleaned, and the like, and the check valve 4 is endeavored to maintain the check valve prevention function.

In this way, the stop cock with the check function stops the tap water on the primary side by rotating the ball 2 accommodated in the stop cock chamber 1b of the main body barrel 1, and in this state, When the check valve 4 provided in the check valve chamber 1d is not functioning normally, the reverse flow can be checked by discharging the tap water flowing back from the check valve chamber 1d to the outside. Since the check valve check device 6 is provided, the check valve 4 check function can be checked by operating the check valve check device 6 even when a check valve with a check check function is installed in the water supply line. Can be done.
In addition, since the check valve with the check check function can check the check valve prevention function of the check valve 4 by using the check valve check device 6 without using a tool, the check valve 4 can be prevented from flowing back in a short time. The function can be checked.
Further, the stop cock with the check check function includes the check valve check device 6 that can check the check valve prevention function of the check valve 4, so anyone can check the check valve prevention function of the check valve 4. However, it is a simple task that can be easily performed, and periodic inspections can be performed frequently.
Therefore, if this stop cock with a non-return check function is used, effective maintenance management for preventing water pollution accidents can be performed.

  1 is a body cylinder, 1 'is an inspection cylinder, 1a is an inlet, 1b is a stop cock chamber, 1c is an outlet, 1d is a check valve chamber, 1e is a water passage, 1h is an inspection room, 1i is a drain Outlet, 1j is a branch hole, 2 is a ball, 2a is a water passage hole, 4 is a check valve, 6 is a check valve check device, 29 is a check plug rod, 30 is a spring, 31 is an opening / closing operation mechanism, 32 is Rise pipe.

Claims (3)

  The stop cock chamber (1b) communicating with the inlet (1a), the check valve chamber (1d) communicating with the outlet (1c), the stop cock chamber (1b) and the check valve chamber (1d) are in communication. The main body barrel (1) formed with the water inlet (1e) and the water stop cock chamber (1b) are rotatably accommodated, and the inflow port (1a) and the water inlet (1e) are in communication or non-communication. Provided in the ball (2) formed with the water passage hole (2a) to be in a state and the check valve chamber (1d), allowing the flow of tap water from the water flow port (1e) to the check valve chamber (1d) And a check valve (4) for blocking the flow of tap water from the check valve chamber (1d) to the water inlet (1e), and a backflow of the check valve (4) provided in the body trunk (1). And a check valve check device (6) for checking the prevention function. The check valve check device (6) rotates the ball (2) to perform primary operation. When the check valve (4) is not functioning normally in this state, tap water flowing back from the check valve chamber (1d) to the water inlet (1e) is discharged to the outside. A water stop cock with a check function.   The check valve check device (6) is connected to the main body cylinder (1) in a branched manner, and forms an inspection cylinder (1h) that communicates with the inspection room (1h) and the inspection room (1h). 1 '), a branch hole (1j) formed in the main body barrel (1) and communicating the water inlet (1e) with the inspection chamber (1h), and movably accommodated in the inspection chamber (1h). 1j) provided on the inspection stopper rod (29), the spring (30) for urging the inspection stopper rod (29) away from the branch hole (1j), and the inspection barrel (1 ') The inspection plug rod 29 can be opened / closed between a closed position for closing the branch hole 1j and an open position for opening the branch hole 1j, and the inspection plug rod 29 in the closed position. An opening / closing operation mechanism (31) capable of releasing the holding state of the ball, and rotating the ball (2) to stop the primary side, If the check stopper rod (29) in the closed position is operated to the open position by operating the closing operation mechanism (31) in this state, when the check valve (4) is not functioning normally, the check valve chamber ( 1d) It is configured that the tap water in the back flow is discharged to the outside through the water inlet (1e), the branch hole (1j), the inspection room (1h) and the water outlet (1i). The stop cock with a non-return check function according to claim 1.   The non-return check according to claim 2, wherein a water discharge port (1i) is formed upward in the inspection cylinder (1 ') and a riser pipe (32) is connected to the water discharge port (1i). Functional stop valve.

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