JPH0676460U - Antifreeze tap - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] There is no noise due to vibration of the ball valve, wear of the ball valve, etc. Moreover, when the piston is withdrawn, the operation of the ball valve is slow and there is a risk of water spouting from the upper end of the pipe. There is no provision of antifreeze hydrants. A valve chamber 15 for accommodating a ball valve 14 is provided downstream of the upper cylinder 8 closest to the inlet 2 and separately from the outlet 3, and further between the cylinder and the valve chamber,
A sloped portion, which is narrower than the ball valve and has a downward slope toward the valve chamber, is formed at both ends across the piston 9, and a valve seat 17 of the ball valve is provided at the closest lower end of the cylinder above the valve chamber. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a piston / cylinder type antifreeze water tap that uses a ball as an auxiliary valve.

[0002]

[Prior art]

 Conventionally, an antifreeze water faucet is usually equipped with an auxiliary valve at the inlet so that the piston can be pulled out without stopping the water stopcock installed on the upstream side when repairing the piston. It was being appreciated. Among them, in Japanese Utility Model Publication No. 52-55710 by the same applicant, a ball is used as an auxiliary valve and the valve seat is provided not on the inside of the inlet but on the cylinder side, so that the structure is simple and a large flow rate is achieved. It has the advantage of being obtained and has been widely used.

However, when the rubber packing attached to the inlet is tightened and the hole diameter of the packing becomes smaller than the ball diameter to some extent, the high-speed jet flux hits the ball and vibrates, and the jet flux becomes even smaller. When this happens, the ball is attracted to the inlet side in the opposite direction to the flow direction and vibrates violently in the vicinity to generate noise, which also causes friction with the inner wall of the valve box, causing wear of the ball. It was One way to prevent this is to house the ball at the outlet instead of at the inlet, and because the pressure distribution acting on the ball surface becomes irregular, the phenomenon described above is completely eliminated. Can be resolved.

[0006] Although the purpose is different, as an example of Japanese Utility Model Publication No. 52-55711 of the same applicant, there is disclosed one in which a ball is housed in an outlet. However, the above-mentioned ones have the following drawbacks. In other words, when removing the piston from the valve box, there is no problem if the faucet provided at the end of the rising pipe is closed, but if the piston is pulled out with the faucet open, the piston will not completely separate from the valve box. Of these, the ball is moved to the outlet side by the water flow, and the ball moves to the cylinder side for the first time when the piston separates from the valve box and a larger amount of water flows out into the pipe than it flows to the outlet side. Then, the valve seat provided at the lower end of the cylinder is closed. Therefore, it takes a long time for the ball to move, and there is a drawback that water spouts from the upper end of the pipe even if temporarily.

[0005]

[Problems to be solved by the device]

 In view of the above points, in the present invention, even if the hole diameter of the packing on the outlet side is reduced, there is no noise or wear due to vibration of the ball, and the ball moves instantly when the piston is pulled out from the valve box. The purpose of the invention is to provide an antifreeze water tap that prevents accidents such as closing the valve seat and spouting water from the upper end of the pipe.

[0006]

[Means for Solving the Problems]

 In order to prevent the jet flow from the inlet from directly hitting the ball, the present invention stores the ball in a valve chamber provided above the upper cylinder closest to the inlet and separately from the outlet, and further, the cylinder and the valve. Between the chamber and the ball valve, slopes that are narrower than the ball valve and have a downward slope toward the valve chamber are formed with pistons at both ends, and the valve seat of the ball valve is located at the lower end of the closest cylinder above the valve chamber. Is provided.

[0007]

[Action]

 Therefore, when the jet flow from the outlet reaches the ball, it becomes a completely diffused irregular flow, so the above-mentioned vibration does not occur at all here, and the valve chamber is provided near the valve seat, and Since the ball does not move to the outlet side due to the above-mentioned slope, the ball can immediately close the valve seat when the piston is pulled out.

[0008]

【Example】

 FIG. 1 shows an embodiment of the present invention. In the figure, reference numeral 1 is a valve box of the present invention, and an inlet 2, an outlet 3, and a drainage port 4 are formed on a side wall in order from the bottom, and a flow is provided inside. A cylinder 5 is provided below the inlet 2, a cylinder 6 is provided between the inlet 2 and the outlet 3, a cylinder 7 is provided between the outlet 3 and the drain 4, and a cylinder 8 is provided above the drain 4. Reference numeral 9 is a piston, and annular packings 10, 11, 12, 13 for sliding the cylinders 5, 6, 7, 8 respectively are mounted on the outside. A valve chamber 15 for accommodating a ball valve 14 is formed between the cylinders 6 and 7 of the valve box 1 on the side opposite to the outlet 3 via a piston 9, and the piston 9 is sandwiched between the cylinders 6 and 7 on both sides of the valve chamber 15. A narrow sloped portion 16 that slopes downward toward the valve chamber is provided, and a valve seat 17 on which the ball valve 14 abuts is formed at the lower end of the cylinder 7.

Although not shown, a check valve for preventing contamination of underground wastewater is attached to the drain port 4, and the valve box 1 extends upward through a pipe 18 and the piston 9 extends upward through a rod 19. It is extended and connected to an operating part (not shown) on the ground. Although not shown, a start-up pipe is connected to the downstream side of the outflow port 3 and is connected to the end faucet. Reference numeral 20 denotes a plug of the valve chamber 15, which may be screwed in after accommodating the ball valve 14.

The figure shows a water flow state, in which water from the inflow port 2 flows through the gap between the cylinder 6 and the piston 9 from the outflow port to the faucet at the end via the rising pipe. At this time, the annular packings 10 and 12 are in close contact with the cylinders 5 and 7, respectively, and no water leaks from them. When draining water from the rising pipe, the rod 19 and the piston 9 may be lifted from the state shown in the figure. First, the annular packing 11 is brought into close contact with the cylinder 6 to block the water from the inflow port 2, and then The annular packing 12 is separated from the cylinder 7, and the water in the rising pipe is discharged from the drain port 4 to the ground. At this time, since the annular packing 13 is in close contact with the cylinder 8, water does not rise in the pipe 18.

Even if the rubber packing (not shown) on the inlet 2 side is tightened and the hole diameter becomes small in the water passing state in the figure, the high-speed jet from there hits the piston 9 and diffuses through the cylinder 6. Therefore, the ball valve 14 is not hit with a regular jet flow, so that the above-described noise and wear of the ball valve do not occur. In addition, since there is no ball valve in the main flow path that leads to an increase in loss resistance, it is possible to expect a further increase in flow rate compared to the reference example.

Next, the case where the piston 9 is pulled out from the valve housing 1 due to a failure of the annular packing or the like will be described. When the faucet at the end of the rising pipe is pulled out with the faucet closed, the water from the inflow port 2 tries to jet into the pipe 18, and the ball valve 14 instantly rises and abuts the valve seat 17 with this water flow. The water from the inflow port 2 is shut off. Even if the faucet is opened in this state, the ball valve 14 closes the valve seat 17 by water pressure, so that there is an advantage that the faucet can be opened and water can be used freely even during piston repair. Also, when the piston 9 is pulled out with the faucet open, the ball valve 14 cannot move to the outlet 3 side due to the slope portion 16, so the piston 9 separates from the cylinder 8 and water flows out into the pipe 18. As soon as the water flow starts, the ball valve 14 rises and closes the valve seat 17. Therefore, as in the cited example, the amount of water flowing into the pipe is larger than the water flowing toward the outlet side. The ball valve does not come into contact with the valve seat.

When repairing is finished and the piston 9 is inserted, the tip of the piston 9 pushes down the ball valve 14 against the water pressure to separate it from the valve seat 17, and further pushes the ball valve 14 along the slope 16. The piston 9 returns to the position shown in the figure after the ball valve 14 is retracted into the valve chamber 15 while descending in the cylinder while rolling. At this time, if the tap is inserted with the faucet open, the water pressure is reduced by that much, and the force for pushing down the ball valve 14 is also reduced, and the insertion is performed smoothly, which is very convenient especially at high water pressure.

In the illustrated embodiment, the valve chamber 15 is provided on the opposite side of the outflow port 3 via the piston 9, but this is provided at an appropriate position other than the outflow port 3, such as being provided in a right angle direction. be able to. As another embodiment, the position of the outflow port 3 is lowered to be provided on the same axis as the inflow port, and the direction of the inflow port 2 and the outflow port 3 can be freely changed by dividing the valve box into two. The drainage port 4 is provided at the lower end portion of the valve box 1, and the drainage passage is formed in the piston 9 for drainage, and the design change is free to the extent not departing from the gist of the present invention. .

[0015]

As described above, according to the present invention, since the ball valve is not housed in the inflow port, no matter how small the hole diameter of the packing attached to the inflow port becomes, the ball valve has a regular rule. Since the jet does not act, vibration, noise, wear of the ball valve, etc. do not occur, and the ball valve immediately closes the valve seat when the piston is pulled out, so the ball valve is housed at the inlet. There is no fear of water spouting from the upper end of the pipe, as described above, and it is possible to obtain an even larger flow rate.

[Brief description of drawings]

FIG. 1 is a vertical sectional view in a water passing state showing one embodiment of the present invention.

[Explanation of reference numerals] 1 valve box 2 inflow port 3 outflow port 4 drainage port 5, 6, 7, 8 cylinder 9 piston 10, 11, 12, 13 annular packing 14 ball valve 15 valve chamber 16 beveled portion 17 valve seat 18 pipe 19 rod 20 plug

Claims (1)

[Scope of utility model registration request] 1. An antifreeze system in which a piston having an annular packing moves up and down in a valve box provided with an inlet, an outlet, and a drainage port on a side wall and a required number of cylinders inside to stop and drain water. In the water tap, a valve chamber accommodating a ball valve is provided above the cylinder separately from the outlet provided through the closest cylinder above the inlet, and the ball valve is provided between the cylinder and the valve chamber. An antifreeze water tap having a narrower slope with a downward slope toward the valve chamber, sandwiching pistons at both ends, and a valve seat of the ball valve provided at the closest lower end of the cylinder above the ball valve.