JPH10110839A - Water/hot water drain valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water/hot water drain valve used in a cold district and constituted in such a way as to be able to drain water and hot water in a feed water pipe and a feed hot water pipe completely with single operation. SOLUTION: Annular packing 12, 12' of a piston 13 in close contact with cylinders 5, 6, 7, 9, 9' in a valve casing 1 with a water inlet 2 and a hot water inlet 3 provided at side walls and connected to a feed water pipe and a feed hot water pipe are detached from the cylinders 5, 6, 7, 9, 9' by moving the piston 13 so as to drain both water and hot water from a drain port 4 provided at the lower end of the valve casing 1. Check valve elements 11, 11' for preventing contraflow at the time of either one of water and hot water being higher in pressure than the other are normally detached from check valve seats 8, 8' and accommodated in the water inlet 2 and the hot water inlet 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain valve used in cold regions, and more particularly to a hot water discharge valve for simultaneously discharging hot water and water in a pipe after an antifreeze water tap.

[0002]

2. Description of the Related Art Conventionally, in a cold region, an antifreeze water faucet is operated to drain water from a pipe to prevent freezing. However, a water supply pipe is branched from just before entering a boiler. Crawling under the floor, along with the hot water pipe after the boiler,
When performing so-called underfloor piping when starting up in required places such as kitchens and bathrooms, simply operating the antifreeze hydrant does not completely drain the water supply and hot water supply pipes. A water stop valve is provided in the hot water supply pipe, and after operating the antifreeze water tap, each water stop valve is opened to drain water from the water supply pipe and the hot water supply pipe.

[0003]

However, in the above method, two water shutoff valves must be opened and closed, and the operation is troublesome. Therefore, a product that can simultaneously discharge hot water and water by one operation is desired. Was rare.

[0004]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above-mentioned problems. A water supply pipe and a hot water supply pipe are connected to a water inlet and a water inlet provided on a side wall of a valve box of a valve.
By moving the piston to separate the annular packing of the piston in close contact with the cylinder in the valve box from the cylinder, hot water and cold water are both discharged from the outlet provided at the lower end of the valve box. When either pressure is higher than one pressure, the check valve to prevent backflow is always detached from the check valve seat so that the hot and cold water of the water supply pipe and hot water supply pipe can be completely drained, and the water inlet It is housed in the bath.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The hot and cold water discharge valve of the present invention is connected to water supply and a hot water supply pipe under the floor. Therefore, usually, a valve box and a piston are extended to a room by pipes and rods, and a handle connected to a rod end is provided by a handle. It is operated manually, but without using a pipe, extend only the rod and operate it manually with the floor handle.Or, instead of manual operation, use a motor or an electromagnetic valve to operate the motor so that the drive unit does not enter the room. Of course, it is also possible.

A valve box requires at least three cylinders, and a piston requires at least three annular packings that slide on the cylinders.
The annular packing can also be specified as an annular flat packing. A commercially available O-ring is usually used for the annular packing. Some countermeasures are required, such as making a pressure relief hole at the bottom of the groove. If an annular flat packing is used, there is no fear of blowout.

[0007] The check valve body is provided with a check packing, which may be provided on the check valve seat side. If the check valve seat is made cylindrical and one-way sealing packing such as Y packing is mounted on the check valve body to slide and seal, the sealing performance at low pressure is excellent, but of course it is not limited to this. Alternatively, an O-ring or an annular flat packing may be in contact with the check valve seat.

Although the water inlet and the water inlet are usually provided coaxially, they may be formed stepwise if there is no problem in piping. It is desirable that the outlet is open to the atmosphere with a hopper etc. below it, and it is preferable not to screw the drainage pipe directly from the point of contamination with sewage.However, even if the drainage pipe is directly connected due to piping etc. The check valve body can prevent hot water in the drain pipe from flowing back to the water supply pipe or the hot water supply pipe.

[0009]

Embodiments will be described with reference to the drawings.
FIG. 2 is an example of an apparatus diagram of piping using the present invention. One port of a hot water discharge valve A has a pressure reducing valve in the middle of a rising pipe C connected to an antifreeze water tap B on the upstream side. D and boiler E
A branch is connected to a water supply pipe F branched from between, and the other port is branched and connected to a hot water supply pipe G after the boiler E. The water supply pipe F and the hot water supply pipe G run under the floor as they are, and are connected to a faucet or a mixing tap H that is started up and supplied with water to a kitchen or the like. Drainage from the hot and cold water discharge valve A is received by the hopper J, and guided to sewage or the like by the drainage pipe K.

FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes a valve box, and a water inlet 2 connected to a water supply pipe F and a water inlet 3 connected to a hot water supply pipe G are coaxially arranged laterally. It is made to protrude upward, and the discharge port 4 is opened at the lower end. The positional relationship between the water inlet 2 and the water inlet 3 may be reversed. Inside, three water stop cylinders 5, 6, and 7 are formed coaxially from the top so as to be orthogonal to the water inlet 2 and the water inlet 3. Check valve seat 8 at inlet 2
Is formed by screwing the same check valve seat 8 ′ to the inlet 3, a guide cylinder 9, 9 ′ adjacent to the check valve seat 8, 8 ′, and a bypass passage at the lower end thereof. 10, 1
0 'is opened to the water stop cylinders 6 and 7.

The check valve bodies 11 and 11 'are provided with check packings 12 and 12' using one-way sealing Y packing which are in close contact with the check valve seats 8 and 8 '. Valve box 1
The piston 13 housed in the cylinder 5
Three annular packings 14, 1, which respectively slide 6, 7
5 and 16 are mounted, and pressure relief holes 17 and 18 are formed in the lower end flanges of the annular packings 15 and 16 which separate from the water stopping cylinder to prevent blowout when the annular packing separates from the cylinder. . The valve box 1 is extended into the room by a pipe 19, and the piston 13 is extended into a room by a rod 20.
Although not shown, the operation unit body and the operation rod are connected to each other, and a handle is connected to the upper end of the operation rod.

The figure shows a water-stop state, in which the water on the inlet 2 side is sealed by annular packings 14 and 15, the hot water on the inlet 3 side is sealed by annular packings 15 and 16, and leakage to other places is prevented. Absent. When draining water from the piping to prevent freezing, the antifreeze water tap B in FIG. 2 must first be drained, and then the handle 13 is turned to raise the piston 13. The water in C is placed underground from the antifreeze water tap B, and the hot water in the water supply pipe F and the hot water supply pipe G is separated upward from the water stop cylinder 6 by the annular packing 15 and from the water stop cylinder 7 by the annular packing 16 respectively. To bypass the
Through the outlet 4 to the hopper J.

At the moment when the annular packings 15 and 16 are separated from the water stopping cylinders 6 and 7, the downward release of the annular packings, that is, blowout is prevented by the pressure relief holes 17 and 18. Is higher than the pressure on the water inlet 2 side and the hot water on the water inlet 3 side is going to flow toward the water inlet 2 side, the annular packing 15 is detached upward,
That is, blowout may occur. In that case, the pressure relief holes 17 will rather act as blow-outs, and a similar relief hole in the upper part of the annular packing 15 will have little effect.

Therefore, in the present invention, before the annular packing 15 separates from the water stopping cylinder 6, the annular packing 1 is removed.
6 is released from the water stop cylinder 7 to release the pressure in the hot water supply pipe G. The effect is that the operation is erroneous and the apparatus is operated before the water is drained by the antifreeze water tap B. It comes out big when such. In this case, if the water stop cylinder 7 at the lowermost end is formed in a valve seat shape and an annular flat packing is used as the annular packing 16, the same effect can be obtained with a small stroke.

When draining water, whichever pressure is strong,
The non-return valve bodies 11 and 11 ′ are brought into close contact with the non-return valve seats 8 and 8 ′ by the water flow to prevent the reverse flow, so that the mixing of hot water into the water supply pipe F and the hot water supply pipe G can be effectively prevented. At this time, the check valve 1
1, 1 'slides the guide cylinders 9, 9' and is located coaxially with the check valve seats 8, 8 ', so that the check valve seats 8, 8' can be reduced with a smaller flow of water. , And the water stopping effect is also excellent. In any case, the check valve bodies 11 and 11 ′ are always separated from the check valve seats 8 and 8 ′, and the bypass passages 10 and 10 ′ are the lowermost portions of the water inlet 2 and the hot water inlet 3. Therefore, the hot water in the water supply pipe F, the hot water supply pipe G, the water inlet 2, and the water inlet 3 can be completely discharged.

[0016]

As described above, according to the present invention, the hot water in the water supply pipe and the hot water supply pipe can be completely discharged by one operation, so that the operation is simple and there is no fear of freezing accident.
The check valve can effectively prevent hot water from flowing backward from the water supply pipe, hot water supply pipe or drain pipe, and also has the effect of preventing accidents such as detachment of the annular packing due to blowout.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a water blocking state according to an embodiment of the present invention.

FIG. 2 is an apparatus diagram showing an embodiment of a pipe of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 2 Water inlet 3 Water inlet 4 Outlet 5, 6, 7 Water stop cylinder 8, 8 'Check valve seat 9, 9' Guide cylinder 10, 10 'Bypass path 11, 11' Check valve body 12, 12 'Non-return packing 13 Piston 14, 15, 16 Annular packing 17, 18 Pressure relief hole 19 Pipe 20 Rod A Hot water discharge valve B Antifreeze water tap C Rising pipe D Pressure reducing valve E Boiler F Water supply pipe G Water supply pipe H Faucet J hopper K drainage pipe

Claims (3)

[Claims] 1. A water inlet, a water inlet, and a check valve seat formed in each of the side walls, a discharge port at a lower end, and a plurality of water stoppers in a direction perpendicular to the water inlet and the water inlet. Into a valve box having a water cylinder, a piston fitted with an annular packing that slides on the water stop cylinder is inserted, and further, each of the water inlet and the water inlet is always separated from the check valve seat. A hot and cold water discharge valve containing a check valve body that closes when a backflow occurs. 2. A guide cylinder adjacent to the check valve seat and a bypass passage opening at the lower end of the guide cylinder adjacent to the check valve seat are formed at each of the water inlet and the water inlet, and are fitted to the guide cylinder. 2. The hot and cold water discharge valve according to claim 1, wherein a cylindrical check valve is housed. 3. The hot and cold water according to claim 1, wherein the lowermost annular gasket mounted on the piston is detached from the water stop cylinder earlier than the annular gasket immediately above the lowermost gasket to discharge hot water. Discharge valve.