JPH08417U - Valve structure of antifreeze faucet - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] A positive valve that has a reliable timing for stopping and draining water, has no damage to the ring rubber due to blowout, has a light handle operation, and is applicable to large diameters. Provide a type of antifreeze hydrant. [Structure] An upper main valve seat 4 is provided in an intermediate portion between an inflow port 2 and an outflow port 3, a cylinder 5 is provided above it, and a drainage port 6 is provided above the main valve seat, without removing the cylinder. A sliding annular packing is mounted, an upward drain valve seat 9 and a piston 7 forming a pressure receiving cylinder 10 are housed therein, and a main packing 13 for closing the main valve seat at the lower end is provided inside the piston. A drain packing 15 that closes the drain valve seat is installed above it, and a pressure receiving ring rubber 16 that slides without detaching the pressure receiving cylinder is installed above the drain packing 15, and a pressure water introducing hole 17 that opens at the upper and lower ends is provided inside. Upon piercing, it houses the main valve which is always pressed downward by the spring housed in the piston.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a valve structure of a so-called positive valve type antifreeze water tap, in which a flat packing presses a valve seat provided upward to stop water.

[0002]

[Prior art]

 Conventionally, many antifreeze hydrants of this type have used springs for timing of water stop and drainage, and the representative one is JP-B-44-27022. This separates the piston from the main valve that closes the valve seat, and connects the drain valve that closes the drainage passage inside the piston and the main valve via a spring.The main valve is the valve seat. After contacting and shutting off the water from the inlet, the piston is further lowered while compressing the spring, and the drain valve opens the drain passage to allow drainage.

Therefore, the timing of stopping water and drainage is reliable, and since the ring rubber does not separate from the cylinder, there is no accident that the ring rubber blows out during drainage and is damaged. there were. However, on the other hand, in order to prevent simultaneous water leakage, a strong spring must be used against the water pressure that pushes up the main valve in high water pressure, and the handle operation becomes extremely heavy from the middle. There was a defect. As a matter of course, if the valve seat diameter of the main valve is increased, the force for lifting the main valve also increases, so it is practically impossible to apply the reference example to the large-diameter antifreeze water tap, and it is practically impossible to design. It was a big constraint.

[0004]

[Problems to be solved by the device]

 In view of the above point, the present invention provides a valve structure of an antifreeze water tap that allows the ring rubber to be drained without being separated from the cylinder and the handle torque can be made constant regardless of the size of the valve seat diameter of the main valve. The purpose is to

[0005]

Therefore, according to the present invention, a ring rubber that slides without detaching the cylinder is provided in a valve box having a cylinder above the main valve seat and a drain port above the cylinder. It is installed inside to accommodate a drain valve seat and a piston forming a pressure receiving cylinder above it, and inside the piston, the main packing that closes the main valve seat at the lower end and the drain valve seat above it. The drainage packing is closed, and the pressure receiving ring rubber that slides without detaching the pressure receiving cylinder is installed above it, and the pressure water introducing holes opening at the upper and lower ends are bored inside, and the spring housed in the piston constantly It accommodates the main valve that receives downward pressure.

[0006]

[Action]

 In other words, when the piston is lowered and the main packing comes into contact with the main valve seat and the water is stopped, the rising force of the water pressure on the inlet side acting on the main valve and the pressure chamber through the pressure water inlet. It is to cancel the downward force due to the water pressure that moves in and works downward, and then lowers the piston further from that state to disengage the drain packing from the drain valve seat and put it in the drain state. Since it requires only a weak one, it is easy to handle and can be applied to large-diameter antifreeze water taps.

[0007]

【Example】

 An embodiment of the present invention is shown in FIG. 1. Reference numeral 1 is a valve box having an inlet 2 and an outlet 3 on a side wall thereof and an upward main valve seat 4 at an intermediate portion thereof. A cylinder 5 is coaxially formed above the main valve seat 4, and a drain port 6 is provided on the upper side wall thereof. Reference numeral 7 is a piston, and a ring rubber 8 which slides the cylinder 5 is attached to the outer peripheral portion, and an upward drain valve seat 9 and a pressure receiving cylinder 10 having a larger diameter than the drain valve seat 9 are formed coaxially inside thereof. A drainage lateral hole 11 is formed in the side wall between the two. A main valve 12 is housed in the piston 7. A main packing 13 for closing the main valve seat 4 is caulkedly attached to the lower end of the main valve seat 4 via an L-shaped metal fitting 14, and a drain valve seat 9 is closed above the main packing 13. The drain packing 15 and the pressure receiving ring rubber 16 that is in close contact with the pressure receiving cylinder 10 are attached.

A pressure water introducing hole 17 opening at the upper and lower ends is bored inside, and a downward pressing force is applied to the main valve 12 together with a spring 19 housed in a sealed pressure chamber 18. The pressure chamber 18 is provided with a step portion 20 serving as a stopper when the piston 7 descends, and a drain passage 21 is formed below the pressure receiving cylinder 10 with a gap between the inner wall of the piston 7 and the outer wall of the main valve 12. Although not shown, the valve box 1 is extended by a pipe 22 and connected to the operation body on the ground, and the piston 7 is extended by a valve shaft 23 and connected to a handle via a spindle or the like that is screwed into the operation body. A check valve for preventing backflow of groundwater is attached to the drain port 6.

The figure shows a water flowing state, in which water from the inflow port 2 passes through the main valve seat 4 to the outflow port 3 and to a terminal faucet via a rising pipe (not shown). At this time, the ring rubber 8, the drain packing 15, and the pressure receiving ring rubber 16 do not flow to other places. Further, since the diameter of the pressure receiving cylinder 10 is larger than the diameter of the portion where the drainage packing 15 contacts the drainage valve seat 9, it enters the pressure chamber 18 through the pressure water introducing hole 17 and acts on the pressure receiving ring rubber 16. The water pressure in the downward direction overcomes the water pressure in the upward direction acting on the main valve 12, and even if a high water pressure is generated due to a pressure test during installation or a water hammer, for example, the area difference between the two will further enhance the sealing performance, and the drain valve seat There is no risk of water leakage between 9 and the drain packing 15, but conversely, when abnormal high water pressure due to freezing etc. occurs, the strength of the spring 19 is also set so that the abnormal water pressure can be released to the drain port 6 side. In consideration of this, it is possible to appropriately reverse the area difference between the two.

Next, when the drainage state is set, the piston 7 connected via the valve shaft 23 may be lowered by operating the handle, but the main valve 12 pressed by the spring 19 is also lowered at the same time, The main packing 13 contacts the main valve seat 4 to shut off the pressure water from the inflow port 2. At this time, when the diameter of the pressure receiving cylinder 10 is equal to or larger than the diameter of the abutting portion, the main valve 12 has a lowering force than a raising force regardless of the magnitude of the primary pressure in combination with the force of the spring 19. Therefore, the main valve 12 is lifted by the water pressure, the drain packing 15 is separated from the drain valve seat 9, and the water flows to the outflow port 3 and the drain port 6 at the same time, so-called simultaneous leakage does not occur. However, in the case where the diameter of the pressure receiving cylinder 10 cannot be made smaller due to design restrictions such as the diameter of the pipe 22 cannot be made larger than the diameter of the main valve seat 4, Simultaneous leakage occurs depending on the water pressure on the side, so it is necessary to strengthen the spring 19 accordingly. However, even in that case, a much weaker spring will do as long as it is compared with the one in the reference.

When the piston 7 is further lowered from the water-stopped state, the drain valve seat 9 is detached from the drain packing 15, and the water in the rising pipe passes through the drain passage 21 and the drain horizontal hole 11 to be drained from the drain port 6. It begins to discharge into the ground. Further descending, the stepped portion 20 of the piston 7 comes into contact with the upper end of the main valve 12 to stop the descending, and the fully closed state is achieved. Also at this time, the ring rubber 8 and the pressure receiving ring rubber 16 are kept in close contact with the cylinder 5 and the pressure receiving cylinder 10, respectively.

When resuming the water flow state, the handle 7 may be turned in the opposite direction to raise the piston 7, and the sum of the pressing force of the spring 19 acting on the main valve 12 and the downward water pressure may be increased. Since it is larger than the pressing force of, the piston 7 first rises, and after both the drain valve seat 9 and the drain packing 15 come into contact with each other, both rise and the water flow state shown in FIG. That is, simultaneous water leakage does not occur under any condition.

FIG. 2 is a vertical sectional view showing another embodiment of the piston and the main valve of the present invention. The main valve 12 has a ring rubber 16 sliding on the pressure receiving cylinder 10 and the drain valve seat 9 closed. The drain packing 15 is integrally formed and mounted, and accordingly, the pressure receiving cylinder 10 and the drain valve seat 9 are brought close to each other so that the drain horizontal hole 11 is provided at a low position. A convex portion 24 is provided below the piston 7 to serve as a guide for the main valve 12 and a base for the spring 19. An oblique hole 25 is formed in the piston 7 and communicates with the drainage passage 21. A screw is provided on the lower end of the main valve 12, a valve piece 26 is screwed on, and fixed by a nut 27 to be integrated with the main valve 12. The lower end of the piston 7 abuts the upper end of the valve piece 26 to stop the descent during the descent, but the other operating modes are the same as those in FIG.

[0014]

[Effect of the present invention]

 As described above, according to the present invention, when the water is stopped, the ascending force and the descending force due to the water pressure acting on the main valve can be almost balanced. Although it is a water tap, the timing of stopping and draining water is reliable, and since the ring rubber does not separate from the cylinder, accidents due to blowout can be prevented, while keeping the advantage of the cited example as it is, but the size of the main valve seat. It has the excellent feature that it can be applied to large-diameter antifreeze water taps because the handlebar torque can be kept constant regardless of the type.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view showing another embodiment of the piston and the main valve of the present invention.

[Explanation of symbols]

 1 Valve box 2 Inlet 3 Outlet 4 Main valve seat 5 Cylinder 6 Drain port 7 Piston 8 Ring rubber 9 Drain valve seat 10 Pressure receiving cylinder 11 Drain side hole 12 Main valve 13 Main packing 15 Drain packing 16 Pressure receiving ring rubber 17 Pressure water introduction Hole 19 Spring 21 Drainage passage 22 Pipe 23 Valve shaft

Claims (1)

[Scope of utility model registration request] 1. An upper main valve seat is provided in the middle of the inlet and outlet provided on the side wall, a cylinder is provided above the main valve seat coaxially with the main valve seat, and a drain port is provided on the upper side wall thereof, and the upper end is a pipe. A valve box to be connected and a ring rubber that slides without detaching the cylinder are installed, an upward drain valve seat and a pressure receiving cylinder above it are formed coaxially, and a horizontal drain hole is formed on the lower side wall of the pressure receiving cylinder. A piston whose upper end is connected to the valve shaft, a main packing which is housed in the piston and closes the main valve seat at the lower end, and a drain packing which closes the drain valve seat above the main packing. The pressure receiving ring rubber that slides without detaching the pressure receiving cylinder is installed in the upper part, and the pressure water introducing holes opening at the upper and lower ends are bored inside, and the spring housed in the piston always keeps the downward pressure. A valve structure of an antifreeze water faucet consisting of a main valve that receives a pressing force.