JPH10140627A - Hot water discharge valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perfectly discharge the hot water within a water feed pipe or hot water feed pipe with a simple operation and prevent the freezing accident by housing check valve elements in inflow ports provided in different levels in a valve box to form a double check valve structure, and providing narrow diameter parts each between annular packings of a piston closely fitted to a cylinder within the valve box. SOLUTION: Hot water inflow parts 2, 3 are provided in different levels on the side wall of a valve box 1, upstream check valve seats 8, 8' and downstream check valve seats 10, 10' are formed on the inflow ports 2, 3, respectively, to house check valve elements 11, 11' between the both. Within the valve box 1, cylinders 5-7 are concetrically provided above the upper inflow port 2, between both the inflow ports 2, 3, and under the lower inflow port 3, respectively, and a discharge port 4 is formed on the lower end part. Further, a piston 13 having annular packings 14-16 for sliding each cylinder 5-7 has narrow diameter parts 17, 18 between the upper annular packing 14 and the middle annular packing 15 and between the middle annular packing 15 and the lower annular packing 16, respectively.

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 problem. Two inlets for hot and cold water are provided on the side wall of a valve box at different heights so as to be in close contact with a cylinder in the valve box. By displacing the annular packing of the piston from the cylinder by moving the piston, the hot water and cold water are both discharged from the discharge port provided at the lower end of the valve box, and further, the backflow from the hot water to the water is prevented. Check valve body is accommodated in both inflow ports, and an upstream check valve seat and a downstream check valve seat are provided before and after both check valve bodies to form a double check valve. The upper annular packing and the middle annular packing of the piston, the middle annular packing and the lower annular packing of the piston so that the valve body is detached from the downstream check valve seat and can be in close contact with the downstream check valve seat when water is stopped. With a small diameter part between each Than it is.

[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, but is not limited to this.

[0007] If a resin ball is used for the check valve, the cost is low and the water can be stopped with a small flow of water.
Similarly, the present invention is not limited to this, and an O-ring may be used for the check valve seat, or an O-ring or Y
A one-way sealing packing such as a packing may be attached.

Either of the upper and lower inlets may be connected to a water supply pipe or a hot water supply pipe, and the discharge port is provided with a hopper or the like below it to open to the atmosphere. However, even when the drainage pipe is directly connected due to piping or the like, the check valve body can prevent hot water in the drainage 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 is connected to a side, and a water supply pipe G is connected below the water inlet 2. Inlet 3 on the hot water side
And a discharge port 4 is opened at the lower end. The positional relationship between the two inlets may be reversed. Inside, three cylinders 5, 6, 7 are formed coaxially from the top, above the inlet 2, between the inlets 2, 3, and below the inlet 3, orthogonal to the inlet. A check valve body 9 having an upstream check valve seat 8 formed at the tip thereof is screw-connected to the inflow port 2, and a downstream check valve seat 10 is formed in the downstream valve box. The ball-shaped check valve body 11 is accommodated between the seats. Similarly for inflow port 3,
A check valve body 9 'having an upstream check valve seat 8' is screw-connected, and a check valve body 11 'is housed between the check valve body 9' and the downstream check valve seat 10 '. The two check valve seats 9 and 9 ′ may not be screw-connected, but may be prevented from falling off by a commercially available C-ring or the like so that they can be easily disassembled. A discharge hole 12 is formed further upstream of the upstream check valve seat 8 '.

The piston 13 accommodated in the valve box 1 has:
The three annular packings 14, 15, 16 which respectively slide the cylinders 5, 6, 7 are mounted, and the annular packing 1
The small-diameter portions 17 and 18 are formed between the annular check valves 4 and 15 and between the annular packings 15 and 16 such that the check valves 11 and 11 ′ do not come into contact with the downstream check valve seats 10 and 10 ′ even when they are in close contact with each other. . 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 valve body 1 is connected to the operation section main body and the operation rod, respectively, and a handle is connected to the upper end of the operation rod. 21 is a stopper when the piston 13 descends.

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 released upward from the cylinder 6 and the annular packing 16 from the cylinder 7, respectively. The mounting portions 15 and 16 abut against the check valve bodies 11 and 11 ′ and the downstream check valve seats 10 and 10 ′.
Are all discharged from the gap of the stopper 21 to the hopper J through the discharge port 4.

When draining the water, it is necessary to avoid that the pressure on the hot water side is high and the water enters the water supply pipe from the viewpoint of pollution prevention. In the present invention, however, the check valve body 11 is also used in this case. It immediately moves and comes into contact with the upstream check valve seat 8 to prevent backflow. When the inflow port 3 is connected to the water supply pipe, the check valve body 11 'comes into contact with the upstream check valve seat 8'.

In the event of an accident in the annular packing 15 in the water-stop state shown in FIG.
Since the side is closed, the risk of backflow increases, but in this case, the check valves do not contact the small diameter portions 17 and 18, and the check valve 11 'is connected to the downstream check valve. Because the check valve body 11 is in close contact with the upstream check valve seat 8,
The backflow can be prevented twice, and the safety is further increased.

In the event that the lowermost annular packing 16 has an accident, the check valve body 11 'can be in close contact with the downstream valve seat 10' to prevent water leakage to the discharge port 4. Even when the packing 14 has an accident, there is an advantage that the check valve body 11 is in close contact with the downstream check valve seat 10 to prevent water leakage into the pipe 19. Further, when it is desired to repair the piston 13 by pulling it out of the valve box 1 due to an accident such as gasket or the like, the check valves 11 and 11 'can be connected to the downstream check valve seat 10 without closing the antifreeze water tap provided upstream. , 10 'so as to block out the hot water in the water supply pipe F and the hot water supply pipe G, so that it can be pulled out from the pipe 19 as it is, which is convenient.

[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 prevents the hot water from flowing back from the hot water supply pipe to the water supply pipe. In the event of an accident in the middle annular packing in the water stop state, a double check valve is provided, which provides more safety. Increase,
Water leakage can be prevented even when an accident occurs at the uppermost and lowermost annular packings, and the packings can be easily repaired.

[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, 3 Inlet 4 Outlet 5, 6, 7 Cylinder 8, 8 'Upstream check valve seat 9, 9' Check valve seat body 10, 10 'Downstream check valve seat 11, 11' Check valve 12 Small hole for discharge 13 Piston 14, 15, 16 Annular packing 17, 18 Small diameter portion 19 Pipe 20 Rod 21 Stopper A Hot water discharge valve B Antifreeze water tap C Rise pipe D Pressure reducing valve E Boiler F Water supply Pipe G Hot water pipe H Faucet J Hopper K Drain pipe

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[Procedure amendment]

[Submission date] November 13, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

Claims (1)

[Claims] 1. Two inlets for hot and cold water are provided on the side wall of the valve box at different heights, and each inlet has an upstream check valve seat,
Forming a non-return valve seat downstream to accommodate a non-return valve body between the two,
Inside the valve box, three cylinders are provided coaxially in the direction perpendicular to the inlet, above the upper inlet, between the two inlets, and below the lower inlet, forming a discharge port at the lower end. ,
Hot and cold water discharge of a piston having three annular packings sliding on each of the above cylinders, each having a small diameter portion between the upper annular packing and the intermediate annular packing and between the intermediate annular packing and the lower annular packing. valve.