JPH08295U - 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 small valve cylinder between the inlet and outlet has a main valve seat at the upper end, a large cylinder above it, and a drain port above it. A main packing consisting of an annular packing and a flat packing to be removed, and a ring rubber that slides without detaching the large diameter cylinder are installed, and a drainage chamber is provided inside and a horizontal hole communicating with the upper and lower sides of the drainage channel. And a drain valve that is pressed by a spring in the drain chamber to close the drain passage, and a tip for moving the drain valve during drainage in the upper lateral hole, the tip being outside the large-diameter cylinder. The projecting pins are arranged respectively.

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. 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 the main packing consisting of an annular packing and a flat packing that come into close contact with and separate from the small-diameter cylinder and the main valve seat, and the ring rubber that slides without separating the large-diameter cylinder. A drainage channel is formed by a drainage chamber and a horizontal hole that communicates with the top and bottom of the drainage chamber, and a drainage valve that is pressed by a spring to close the drainage channel is formed in the drainage chamber. Pins, each of which has a tip projecting outward from the large-diameter cylinder, are arranged for moving.

[0006]

[Action]

 That is, when draining water, the piston is lowered so that the annular packing of the main packing comes into close contact with the small diameter cylinder to stop water, and then the tip of the pin contacts the large diameter cylinder or its vicinity. Drainage is performed by moving the drainage valve in contact with it and opening the drainage channel. 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. Even at that time, the ring rubber remains in close contact with the large-diameter cylinder, so that the ring rubber does not blow out, the timing for stopping water and drainage is reliable, and the spring that presses the main valve seat is not required, so the diameter is small and large. Regardless of this, it is possible to provide an antifreeze water faucet that is easy to operate with a handle.

[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. At the lower end, a main packing 12 consisting 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 attached by screws 13 so as not to come off. Then, a ring rubber 14 for sliding the large-diameter cylinder 6 is mounted above it. Inside, a drainage chamber 16 having a downwardly facing drainage valve seat 15 is formed along the axis, and a drainage packing 17 that is in close contact with the drainage valve seat 15 is mounted therein, and a screw 13 A drain valve 19 is housed which is constantly subjected to an upward pressing force by a spring 18 which is locked to.

A lower lateral hole 20 is provided between the ring rubber 14 and the main packing 12, and an upper lateral hole 21 is provided above the drain valve seat 15 in the drain chamber 16 to form a drain passage 22. The upper lateral hole 21 has a small-diameter portion 23 at its tip, and a pin 25 having a small-diameter tip portion 24 protruding from the small-diameter portion 23 to the outside of the large-diameter cylinder 6 is provided in the upper lateral hole 21 and a projection 26 of the drain valve 19. It is housed so as not to leave. Although not shown, the valve box 1 is extended upward by a pipe 27 to be connected to an upper fitting, and the piston 9 is extended upward by a rod 28 to be connected to a handle. Further, a check valve is connected to the drainage 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 14 and the drain packing 17 do not leak water 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 28. 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 blocked, and then the tip end portion 24 of the pin 25 abuts the tapered surface 8, and the pin 25 retreats along the tapered surface 8 in the upper lateral hole 21 to form the protrusion 26. Abut. When it further moves backward, the drain valve 19 bends the spring 18 and swings, and a gap is created between the drain packing 17 and the drain valve seat 15. It begins to be discharged from the drainage port 7 into the ground through the drainage channel 22 starting from 20. That is, so-called simultaneous water leakage does not occur, in which water flows through the outlet 3 and the drain 7 at the same time.

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 of the pin 25 comes into contact with the large diameter cylinder 6. There is. 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 14 remains in close contact with the large diameter cylinder 6, the ring rubber is not damaged by blowout. To return to the water-passing state, the handle 9 may be turned in the opposite direction to raise the piston 9, and first, the tip portion 24 of the pin 25 is disengaged from the large-diameter cylinder 6 or the tapered surface 8 to cause the spring 18 to move. Due to the restoring force, the projection 26 of the drain valve 19 presses the pin 25, the drain packing 17 is brought into close contact with the drain valve seat 15, and then the annular packing 10 is separated from the small diameter cylinder 4, and finally the state shown in FIG. Return. In other words, 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. In other words, the drain valve seat 15 is provided in the drain chamber 16 upward, and the drain valve 19 having the drain packing 17 pressed by the spring 18 locked to the rod 28 has a tip protruding outward from the large-diameter cylinder 6. It has a stop surface 8'for the contacting pin 24 to come into contact with. The main packing 12 is divided into two, the flat packing 11 is made of rubber as in FIG. 1, the annular packing 10 is made of relatively soft plastic, and the annular packing is made by forming a spiral groove on the surface, for example. When 10 enters the small diameter cylinder 4, a small amount of water is allowed to escape to the outlet 3 side to prevent compression of the water on the inlet 2 side. However, of course, the water may 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.

The spring 18 prevents the drain valve 19 from opening under normal water pressure, and opens the drain valve to release the abnormal pressure to the drain port 7 side when abnormal pressure due to a water hammer or freezing occurs. . 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 pin 25 comes into contact with the stop surface 8 ′, and when it is further lowered, the drainage packing 17 is removed from the drainage valve seat 15. Detach and drain. Since it is not necessary to increase the amount of drained water so much even when the diameter is large, it is not necessary to increase the diameter of the drain packing 17 to the left, and therefore the spring 18 need not be too strong. Other operation modes are the same as those of the embodiment of FIG.

[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 maintaining the advantage of the cited example that the timing of stopping water and drainage is reliable and the ring rubber 14 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.

[Explanation of symbols]

 1 Valve Box 2 Inlet 3 Outlet 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 14 Ring Rubber 15 Draining Valve Seat 16 Drainage Room 17 Draining Packing 18 Spring 19 Drain valve 20 Lower lateral hole 21 Upper lateral hole 22 Drainage channel 25 Pin 27 Pipe 28 Rod

Claims (1)

[Scope of utility model registration request] 1. A small diameter cylinder and a main valve seat at the upper end of the small diameter cylinder are formed in the middle of the inlet and outlet provided on the side wall, a large diameter cylinder is formed above the cylinder, and a main valve seat is formed in the valve box. The 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 valve seat is attached to the lower end, and a ring rubber that slides without separating the large diameter cylinder is attached to the outer circumference. A drainage chamber having a drainage valve seat in the axial direction is formed, and a drainage valve that is pressed by a spring and adheres tightly to the drainage valve seat is accommodated. A valve structure for an antifreeze water tap, in which a pin for moving the drain valve at the time of drainage is positioned in the upper lateral hole of the drainage channel so that the tip of the pin projects outward from the large diameter cylinder.