JPH0237877Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is a drain valve that drains water from pipes during cold seasons. This is to eliminate the problem.

(b) Conventional technology In cold regions such as Hokkaido, water in water pipes often freezes during the winter. As a countermeasure to this problem, drain valves have been devised that drain the water from the pipes before going to bed and drain them underground below the freezing depth, and are now used in the majority of households. As shown in Fig. 1, the plumbing in a general household is such that a water pipe 4 located underground below the freezing depth is connected to a drain valve 25 having a drain valve 8, and then passed through a riser pipe 6 connected to the drain valve 25 to a faucet 15. This leads to the following.

As shown in FIGS. 4 and 5, the conventional drain valve has an inlet 3, an outlet 5, and a drain 26 on the side of the lower body 2 in order from above, and the water pipe 4, respectively. A riser pipe 6 and a drain valve 8 are connected.
Also, inside the lower body 2, there is an O-ring 1 on the outer periphery.
2, 13, and 14 is housed in the piston 10, and a vertical hole 17 that communicates with the horizontal hole 16 is bored inside the piston 10. The diameter of the vertical hole 17 is slightly larger at the bottom, and is A stop ball 18 is accommodated. The behavior of the check ball 18 is that when draining water as shown in Fig. 5, it is pushed upward by the water pressure and comes into contact with the seat surface 20, but when the drain valve is operated from draining water to supplying water, it reverses as shown in Fig. 4. The stop ball 18 descends due to its own weight. Next, check ball 18
The function of this is that when the drain valve is used to drain water, it prevents water from flowing in the direction of the outer pipe, and when the drain valve is operated from draining water to supplying water, the drain ball 27 descends and comes into contact with the seat surface 28, which prevents water from flowing into the drain chamber. 19 is sealed, and as the piston 10 rises, the drain chamber 19 becomes negative pressure and tries to prevent the piston 10 from rising, but as mentioned above, the check ball 18 falls due to its own weight, and the drain chamber 19, Since the vertical hole 17 and the horizontal hole 16 communicate with the atmosphere, the piston 11 rises smoothly. This mechanism was Utility Application No. 53-087037.

(c) Problems to be Solved by the Invention However, normally the check ball 18 is in contact with the seat surface 20 of the vertical hole 17 when water is drained from the drain valve; If dirt or pipe rust gets in between the check ball 18
A gap may occur between the piston 10 and the seat surface 20, or the vertical hole 17 may be blocked. If a gap exists, water in the riser passes through the vertical hole of the piston 10 and the outer tube 1 when draining water. It may come out from the operation section 7 after some time. Also, vertical hole 17
When the water drain valve is closed, the piston 10 rises when the water drain valve is turned from draining to water supply, so negative pressure is generated in the drain chamber 19 as described above, and the piston 1
0 could not rise.

(d) Means for solving the problem As shown in FIGS. 2 and 3, a spring 22 that supports the check ball 18 is housed in a chamber 21 that is slightly larger than the vertical hole 17 in the upper part of the inside of the piston 10. ,
A seat surface 20 for a check ball 18 is provided below above and below the piston 10, and a piston hanger 24 provided with a vertical hole 23 communicating with the horizontal hole 16 is screwed inside.

(e) Function When the water drain valve is being supplied with water, the piston 10 is located above the lower body 2 as shown in Figure 2, and water passes through the water pipe 4 and riser pipe 6 and is supplied when the faucet 15 is opened. At this time, if water is present in the riser pipe 6 due to repairs to the drain valve, etc., the pressure of the water in the outer pipe 1 pushes down the check ball 18 and passes through the horizontal hole 16, vertical hole 23, and vertical hole 17 to the drain chamber 19. and is discharged from the drain valve 8. When the water runs out, the check ball 18 comes into contact with the seat surface 20 again by the spring 22.

Further, when draining water from the drain valve, the piston 10 is lowered to the state shown in FIG. 3. Water from water pipe 4 is O
The water is stopped by the rings 12 and 13, and the riser pipe 6
The water inside is discharged underground from the drain valve 8 as indicated by the arrow. At this time, since the check ball 18 is in contact with the seat surface 20 in the vertical hole 17 of the piston 10, water does not enter in the direction of the outer tube 1.

(F) Effect of the invention In the present invention, the check ball 18 is located at a higher position than the known one, and the check ball 18 is always in contact with the seat surface 20 due to the spring 22, so that the drainage chamber 19 Even if dirt or pipe rust accumulates inside, it becomes difficult to enter the check ball 18.

[Brief explanation of the drawing]

Figure 1 is a piping diagram for a general household, Figure 2 is a front sectional view of the present invention when water is being supplied, Figure 3 is a front sectional view of the present invention when water is being drained, and Figure 4 is a water supply showing a known product. FIG. 5 is a front sectional view of a known product when water is drained. In the figure, 2 is the lower body, 3 is an inlet, 5 is an outlet, 6 is a riser, 8 is a drain valve, 10 is a piston, 11 is a cylinder, 12, 13, 14 are O-rings, 16 is a side hole, 17 is a vertical hole, 18 is a check ball, 19 is a drainage chamber, 20 is a seat surface, 21 is a check ball storage chamber, 22 is a spring, 23 is a vertical hole,
24 is a piston suspension.

Claims (1)

[Scope of utility model registration request] A lower main body 2 having an outer shell pipe 1 and an operation part 7 on the upper side, and an inlet 3, an outlet 5, and a drain valve 8 on the sides.
A piston 10 has a cylinder formed inside, several O-rings are attached to the cylinder, and a horizontal hole 16 and a vertical hole 17 are connected to each other. In the drain valve for draining water, a vertical hole 17 is provided inside the upper part of the piston 10.
Slightly larger, check ball 20, spring 22
A drain valve with a negative pressure resolving mechanism for a drain chamber, which has a tapered seat surface 20 in contact with a check ball 20 thereon, and is provided with a piston suspension 24 having a horizontal hole 16 communicating with a vertical hole 23 inside. .