JPH0645493Y2 - Valve structure of antifreeze faucet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement in the valve structure of an antifreeze water tap having a valve seat, which is used in cold regions.

(Prior Art) Conventionally, in an antifreeze water tap having a valve seat, in order to prevent so-called simultaneous water leakage, in which water from the inflow port simultaneously flows to the outflow port side and the drain port side when the handle is operated, for example, FIG. As shown in (4), a method of timing the stoppage of water and the drainage with a spring is often used. That is, when the piston-shaped valve body a is lowered from the water passing state shown in the drawing to the drainage state, first, the piece packing c of the valve piece b comes into contact with the valve seat d to shut off the water on the inflow port e side. The piston-shaped valve body a descends while compressing the spring f, and the annular packing g starts to separate from the cylinder h downward so that the water on the outflow port i side is discharged from the drain hole j. However, in the above-mentioned one, when the handle is operated with the faucet provided at the downstream end of the outlet pipe being closed, when the piece packing c comes into contact with the valve seat d and the piston-shaped valve body a further descends, The water on the outlet side has no place to escape, and the force to compress the water works. Therefore, the steering wheel operation becomes very heavy, or the steering wheel operation becomes impossible, leading to a freezing accident or the like. Therefore, it has been desired that the handle can be smoothly operated even with the faucet closed.

(Problems to be solved by the invention) In view of the above points, the present invention prevents the compression of water when the piston-shaped valve body further descends after shutting off the water on the inlet side when the piston-shaped valve body descends. , It is an object of the present invention to provide an antifreeze water faucet in which the handle can be smoothly operated by letting it escape to the inlet side.

Therefore, in the present invention, a small diameter cylinder is provided between the inlet and the outlet, an upward valve seat is formed at the upper end of the small diameter cylinder, and a large diameter cylinder is provided above the valve seat. A piston shape in which a large-diameter annular packing that slidably moves the large-diameter cylinder and a piece packing that closes the valve seat are attached to the lower end in a valve box having a drainage hole formed in the middle of the large-diameter cylinder. The valve body and the piston-shaped valve body are movably connected to each other via a spring, and a sub valve equipped with a small diameter annular packing for slidably moving the small diameter cylinder at the lower end reciprocates to stop water and drain water. In addition, when the piston-shaped valve body is descending, after the small-diameter annular packing comes into close contact with the small-diameter cylinder, before the large-diameter annular packing separates from the large-diameter cylinder, a constant pressure is applied to the outlet side. When the force rises, the auxiliary valve is lowered by that amount while compressing the spring, and is separated downward from the small diameter cylinder to release the abnormal pressure on the outlet side to the inlet side.

(Operation) As described above, in the present invention, the small-diameter annular packing prevents simultaneous water leakage by the timing of the small-diameter annular packing and the large-diameter annular packing, and prevents the abnormal pressure increase when the handle is operated with the faucet closed. By receiving and automatically descending and letting it escape to the inlet side, the operation of the steering wheel is prevented from becoming abnormal.

(Embodiment) The present invention will be described with reference to the embodiment shown in FIG. 2. The valve box 1 is provided with an inflow port 2 and an outflow port 3 protruding laterally.
A large-diameter cylinder 4 is provided in the upper part, a small-diameter cylinder 5 is provided in the lower part, an intermediate portion between the inflow port 2 and the outflow port 3, and an upward valve seat 6 is provided at the upper end thereof. A drain hole 7 opened in the middle of the large-diameter cylinder 4 is made to project in a direction perpendicular to the paper surface. Inside the valve box 1, the large-diameter cylinder 4 slides 2
A large-diameter annular packing 8, 9 is mounted on the outer circumference, and a piece packing 10 for closing the valve seat 6 is mounted at the lower end, and a piston-shaped valve body 12 is mounted by a packing retainer 11 so as not to separate. The piston-shaped valve body 12 has a vertical hole 13 with an upper end closed inside, and a sub-valve 15 having a small-diameter annular packing 14 attached to the lower end inside the vertical hole 13 cannot be separated from the packing retainer 11 by a nut 16. Store, packing retainer 11 and nut 16
A spring 17 is housed so as to surround the sub valve 15 so that an upward pressing force can be applied to the sub valve 15. The nut 16 may use an E-ring or the like instead. Although illustration is omitted, the valve box 1 is extended upward by a pipe 18 and connected to a fixing metal fitting such as a gland, and a piston-shaped valve body
The rod 12 is extended upward by a rod 19 and is connected to a movable metal fitting such as a spindle so that it can be moved up and down by the rotational movement of the handle.

The figure shows the water flow state, but in the case of draining water in winter, explaining it with the faucet open, if you rotate the handle in the water stop direction and lower the piston-shaped valve body 12 ,
First, the small-diameter annular packing 14 comes into close contact with the small-diameter cylinder 5 to shut off the water on the inlet 2 side, and further descends to separate the large-diameter annular packing 9 from the large-diameter cylinder 4, and the downstream pipe of the outlet 3 ( The water in the drawing (not shown) begins to drain from the drain hole 7, and finally the piece packing 10 contacts the valve seat 6 and the piston-shaped valve body 12 stops descending. That is, it becomes a drainage state. At this time, since the large-diameter annular packing 8 is in close contact with the large-diameter cylinder 4, drainage water does not rise into the pipe 18. Further, since the small-diameter annular packing 14 is in close contact with the small-diameter cylinder 5, the double packing and the piece packing 10 stop water, which is even safer. Next, with the faucet closed, when the small-diameter annular packing 14 comes into close contact with the small-diameter cylinder 5 and then further descends, the water on the outlet 3 side has a difference in area between the large-diameter cylinder 4 and the small-diameter cylinder 5. Therefore, for example, in the conventional product of FIG. 1, there is no escape for water as described above, and the handle becomes very heavy.
Alternatively, the steering wheel cannot be operated. However, in the present invention, the sub valve 15 descends while compressing the spring 17 under the pressure of the area difference, and finally moves downward from the small diameter cylinder 5. The pressure is released and the abnormal pressure is released to the inlet 2 side. Therefore, the above situation does not occur,
The steering wheel can be operated very smoothly. When the piece packing 10 comes into close contact with the valve seat 6,
The sub-valve 15 rises due to the restoring force of the spring 17, and the small diameter annular packing 14 comes into close contact with the small diameter cylinder 5.

(Effect of the Invention) As described above, in the present invention, even if the water draining operation is performed while the faucet is closed, the handle becomes very heavy on the way like the conventional product or the handle cannot be operated. Since the handle can be operated smoothly until the end, it is possible to completely eliminate the risk that drainage failure or drainage failure will occur due to halfway tightening, leading to a freezing accident.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a conventional example, and FIG. 2 is a vertical sectional view showing an embodiment of the present invention. In the figure, 1 is a valve box, 2 is an inlet, 3 is an outlet, 4 is a large diameter cylinder, 5 is a small diameter cylinder, 6 is a valve seat, 7 is a drain hole,
Reference numerals 8 and 9 are large-diameter annular packings, 10 is a piece packing, 11 is a packing retainer, 12 is a piston-like valve body, 13 is a vertical hole, 14 is a small-diameter annular packing, 15 is a sub valve, and 17 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A small diameter cylinder is provided between an inlet and an outlet, and an upward valve seat is formed at an upper end of the small diameter cylinder,
A large-diameter cylinder is arranged above the valve seat, and a valve box having a drain hole in the middle of the large-diameter cylinder, and a large-diameter annular packing for sliding the large-diameter cylinder of the valve box on the outer peripheral portion are provided. A piston-like valve body that is mounted so that a vertical hole with an upper end closed inside is bored and a piece packing that closes the valve seat at the lower end is attached by a packing retainer connected to the lower end of the vertical hole so as not to separate. A sub-valve that is housed in the vertical hole and has a small-diameter annular packing that is attached to the lower end of the small-diameter cylinder and that is vertically detached; and a sub-valve that is locked to the packing presser upper end so as to surround the sub-valve. A valve structure of an antifreeze water faucet equipped with a spring that applies upward pressure to the valve.