JPH08294U - Valve structure of antifreeze faucet - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a positive valve that has a reliable timing for stopping water and drainage, has no damage to the ring rubber due to blowout, has a light handle operation, and is applicable to large diameters. To provide a type of antifreeze hydrant. [Structure] A main valve seat is provided on the upper end of the small diameter cylinder between the inlet and outlet, a large cylinder is provided above it, and a drain port is provided above it. The main packing and the ring rubber that slides without detaching the large-diameter cylinder are installed, and the piston that holds the drainage channel is housed inside.A part of the drainage channel is orthogonal or oblique to the axis of the piston. A drainage chamber is formed so as to intersect with the drainage chamber, and a drainage valve which is pressed by a spring and has a tip protruding slightly outward from the cylinder is accommodated therein.

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]

[Means for Solving the Problems] Therefore, according to the present invention, a main valve seat is provided at an upper end of a small-diameter cylinder between an inlet and an outlet, a large-diameter cylinder is provided above the main valve seat, and a drain port is provided above the main valve seat. Install a main packing consisting of an annular packing and a flat packing that comes into close contact with and separates from the small diameter cylinder and the main valve seat, and a ring rubber that slides without separating the large diameter cylinder, and provide a drainage channel inside. The piston is housed, and a drain chamber that is orthogonal or oblique to the axis of the piston is formed in a part of the drain passage, and a drain packing that is tightly attached to the drain valve seat in the drain chamber is installed in the drain chamber. It is equipped with a drain valve which is pressed by a spring and whose tip projects slightly outward from the cylinder.

[0006]

[Action]

 That is, when draining water, the piston is lowered, and the annular packing of the main packing first comes into close contact with the small diameter cylinder to stop water, and then the tip of the drain valve comes into contact with the large diameter cylinder or the large diameter cylinder. When the drain valve is separated from the cylinder and the drain valve is retracted, the drain packing is separated from the drain valve seat and drainage is performed. Further, the piston descends and the flat packing of the main packing comes into contact with the main valve seat, and the water is completely stopped. At that time, the ring rubber remains in close contact with the large diameter cylinder. In other words, the ring rubber does not separate from the large-diameter cylinder, and the water is drained through the drain passage provided in the piston, so that the ring rubber does not blow out and a spring that presses the main valve seat is required. Since it does not, it is possible to provide an antifreeze faucet that can be easily operated by handle regardless of the size of the caliber.

[0007]

【Example】

 In the embodiment of the present invention shown in FIG. 1, reference numeral 1 is a valve box having an inlet 2 and an outlet 3 on a side wall thereof, a small diameter cylinder 4 at an intermediate portion thereof, and a main valve seat 5 at an upper end thereof. A large-diameter cylinder 6 is further provided with a drain port 7 on its upper side wall, and a tapered surface 8 is formed between the both. Reference numeral 9 denotes a piston, and a lower end of the main packing 12 composed of an annular packing 10 sliding on the small diameter cylinder 4 and a flat packing 11 pressed against the main valve seat 5 is removed by a screw 14 via a washer 13. The ring rubber 15 that slides on the large diameter cylinder 6 is mounted above it. Inside, a horizontal hole 16, a vertical hole 17, which is opened between the main packing 12 and the ring rubber 15, and a drainage channel 19 made up of a drainage chamber 18 formed horizontally are formed above the horizontal hole 16, and the tip of the drainage chamber 18 is reduced. Have a drain valve seat 20.

A drain valve 21 is equipped with a drain packing 22 that is in close contact with the drain valve seat 20, and a tip of a tip end portion 23 is projected slightly outward from the large diameter cylinder 6. A spring 25 locked to a plug 24 closing the other end of the valve always receives a pressing force toward the drain valve seat 20. Although not shown, the valve box 1 is extended upward by a pipe 26 to be connected to an upper fitting, and the piston 9 is extended upward by a rod 27 to be connected to a handle. Further, a check valve is connected to the drain port 7 so that underground wastewater does not enter the valve box 1.

The figure shows a water flow state, in which water from the inflow port 2 flows through the small diameter cylinder 4 and the main valve seat 5 from the outflow port 3 to the rising pipe (not shown), and from the faucet at the end. Has been released. At this time, the ring rubber 15 and the drain packing 22 prevent water leakage to other places. From this state, when water is dropped in winter, the handle 9 may be rotated to lower the piston 9 connected to the handle via the rod 27. First, the annular packing 10 of the main packing 12 is transferred to the small diameter cylinder 4. The water from the inflow port 2 is closely contacted and the water from the inflow port 2 is shut off. Then, the tip end portion 23 of the drainage valve 21 comes into contact with the tapered surface 8 and the spring 25 is bent to move the drainage valve 21. A gap is created between the drain packings 22, and the water in the rising pipe begins to be drained into the ground through the drain port 7 and the drain port 19 from the drain port 7. That is, the so-called simultaneous water leakage, in which water flows through the outlet 3 and the drain 7 at the same time, does not occur.

Further, the piston 9 descends and the flat packing 11 comes into contact with the main valve seat 5 to be in a completely water-stop state. At this time, the tip portion 23 of the drain valve 21 comes into contact with the large-diameter cylinder 6. It has become. However, it may be brought into contact with the tapered surface 8 and stopped, and in any case, it is sufficient to ensure an appropriate drainage amount. Since the ring rubber 15 remains in close contact with the large-diameter cylinder 6, there is no accidental damage to the ring rubber due to blowout. To return to the water-passing state, the handle may be turned in the opposite direction to raise the piston 9, and first the tip portion 23 of the drain valve 21 should separate from the large-diameter cylinder 6 or the tapered surface 8 and Due to the restoring force of the spring 25, the drain packing 22 comes into close contact with the drain valve seat 20, and then the annular packing 10 is separated from the small diameter cylinder 4, and finally returns to the state of FIG. That is, simultaneous water leakage does not occur in any state.

FIG. 2 is a vertical cross-sectional view showing another embodiment of the present invention, but the difference from FIG. 1 is as follows. The same parts as those in FIG. 1 are designated by the same reference numerals. That is, the drainage chamber 18 is provided below the ring rubber 15, and the drainage packing 22 is brought into close contact with the drainage valve seat 20 with the tip of the tip end 23 of the drainage valve 21 contacting the large diameter cylinder 6. An R surface 8 ′ is provided at the lower end of the large diameter cylinder 6. The main packing 12 is divided into two, the flat packing 11 is made of rubber as in FIG. 1, and the ring-shaped packing 10 is made of relatively soft plastic. For example, by providing a spiral groove on the surface, When the annular packing 10 enters the small-diameter cylinder 4, a small amount of water is released to the outlet 3 side to prevent compression of the water on the inlet 2 side. However, this may of course be completely stopped, and in any case, an unstable element such as vibration due to a blowout phenomenon when the annular packing 10 enters the small diameter cylinder 4 can be completely removed.

When the piston 9 is lowered to be in the drainage state, first, the annular packing 10 enters the small diameter cylinder 4 and then the drainage valve 21 is restored by the spring 25 so that the large diameter cylinder 6 and further the R surface 8 are moved. ′, It comes out of contact with the retaining ring 28 shown in FIG. 3 to drain the water. As in the case of FIG. 1, the tip 23 of the drain valve 21 may be kept completely in contact with the R surface 8'while the water is completely stopped. The other operation modes are the same as those of the embodiment of FIG. As another embodiment, for example, the drainage chamber 18 of FIG. 1 is slanted so that the drainage valve 21 is slanted downward so that the drainage valve can be moved more smoothly, and the lateral hole 16 of the drainage channel 19, Instead of the vertical hole 17, an oblique hole is made to penetrate the drainage chamber 18, a flat packing is used for the drainage packing 22, or another large-diameter cylinder is provided above the drainage port 7 to put the drainage water in the pipe 26. The design change is free to the extent that it does not deviate from the gist of this proposal, for example, to prevent it from rising.

[0013]

[Effect of the present invention]

 As described above, according to the present invention, a spring for pressing the main valve seat is required while keeping the advantage of the cited example that the timing of water stoppage and drainage is reliable and the ring rubber 15 can be prevented from being damaged by blowout. Since the handle torque can be made constant regardless of the size of the main valve seat, it has an excellent feature that it can be applied to large-diameter antifreeze water taps.

[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 in a water passing state showing another embodiment of the present invention.

FIG. 3 is an embodiment of the retaining ring of FIG.

[Explanation of symbols] 1 valve box 2 inflow port 3 outflow port 4 small diameter cylinder 5 main valve seat 6 large diameter cylinder 7 drainage port 9 piston 10 annular packing 11 flat packing 12 main packing 15 ring rubber 18 drainage chamber 19 drainage channel 20 drainage Valve seat 21 Drain valve 22 Drain packing 23 Tip part 25 Spring 26 Pipe 27 Rod

Claims (1)

[Scope of utility model registration request] 1. A valve box having a small diameter cylinder formed at an intermediate portion of an inlet and an outlet at a side wall and a main valve seat at an upper end thereof, a large diameter cylinder above the main cylinder, and a drain port above the main cylinder. The main packing consisting of an annular packing and a flat packing that come into close contact with and separates from the small diameter cylinder and the valve seat is attached to the lower end, and a ring rubber that slides without removing the large diameter cylinder is attached to the outer circumference, and a drainage channel is installed inside. A piston is housed, a drain chamber that is orthogonal or oblique to the axis of the piston is formed in a part of the drain passage, and a drain packing that is in close contact with the drain valve seat in the drain chamber is attached to the drain chamber. A valve structure for an antifreeze water faucet, which accommodates a drain valve which is pressed by a spring and whose tip can project slightly outward from the large-diameter cylinder.