JPS6057530B2 - Shutoff valve with fluid leak detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutoff valve with a fluid leak detection device.

Conventionally, in factories and houses that use gaseous fuels such as propane gas, butane gas, methane gas, city gas, etc., and liquid fuels such as light oil and heavy oil, houses have been converted into apartments, high-rise buildings, etc. The fuel is used in a wide variety of areas, including kitchens, bathrooms, air conditioning equipment, etc.Factories also use the above-mentioned fluid fuel for various combustion equipment, and even in building workplaces, water boiling stations are installed on each floor, and fluid fuel is used in various combustion equipment. It was used.

Therefore, due to so-called operational errors such as forgetting to tighten or partially tightening the switching cocks of each equipment, and so-called equipment malfunctions such as cracks in pipes, damaged equipment, and loose connections, crowded apartments, factories, and buildings may be affected. Many accidents occurred in workplaces and many people were killed or injured. Furthermore, maintenance and inspection of each equipment and patrol inspection of switching cocks, etc., in order to prevent these accidents, were time-consuming.

The present invention detects fluid leakage by providing a detection circuit between the main supply path leading to each of the above-mentioned equipment and the main valve, using the main valve as a switching cock, and communicating from the switching cock to the main supply path in a bypass manner. Another object of the present invention is to provide a fluid leakage detection and prevention device that can immediately prevent leakage and prevent accidents from occurring when equipment is in a leakage state.

Next, one embodiment of the present invention will be explained with reference to the drawings.

The embodiment of the present invention shows piping in a general household, factory, building workplace, etc. that uses city gas or propane gas. In the figure, 1 is the main supply path for supplying gas, and the end of the main supply path 1 is shown. On the side, branch pipes 2A to 2E are arranged, and at the tip of each branch pipe 2A to 2E, gas appliances 3A to 3E such as a gas stove, gas opener, instantaneous water heater, bath kettle, gas stove, etc. are installed. They are connected and arranged, and are provided with tips 4A to 4E.

Reference numeral 5 denotes a shutoff valve with a fluid leak detection device (hereinafter simply referred to as a shutoff valve), which is installed in the main supply path 1 and also serves as the main stop valve for the main supply path 1. On the inflow side of the connecting pipe 6 that connects the two, there is a switching cock 7 (
In this example, a switching three-way cock is illustrated.

), and a three-way joint 8 is provided at the other end of the connecting pipe 6, and between the diameter portion 7A of the switching cock 7 and the diameter portion 8A of the three-way joint 8, there is a diameter approximately opposite to the main supply path 1. U
A bypass-like detection circuit 9 rising in the shape of a letter is provided. Reference numeral 10 denotes a detection tube installed perpendicularly to the detection circuit 9, and is made of a thick cylindrical transparent pressure-resistant member such as pressure-resistant glass or synthetic resin. The valve seat 1 has an inner diameter of 10A narrowed into a conical shape.
1A and 11B are formed, and connecting pipes 12 are provided at both upper and lower open ends.
A, 12B are attached, and the lower connecting pipe 12A is connected to the diameter section 7A of the switching cock 7, and the upper connecting pipe 12B is connected to the diameter section 8A of the three-way joint 8, respectively.

Reference numeral 13 denotes a ball valve that is floatably installed inside the detection tube 10, and is formed into a hollow spherical shape so that it easily floats in the vertical direction when a pressure difference is generated in the vertical direction of the tube 10. It is provided so that the seats 11A and 11B can be closed.

The shutoff valve 5 formed in this manner is interposed in the main supply path 1. Next, to explain the operation and effect of the above embodiment in detail, when the handle 7H of the switching cock 7 of the shutoff valve 5 is operated to bring the main supply path 1 into communication with the connecting pipe 6, the mouth part 7A of the switching cock 7 The side is closed, and the gas flows in the T direction indicated by the solid line arrow, and is supplied to each gas appliance 3A to 3E via each branch pipe 2A to 2E by operating the cocks 4A to 4E.

When this gas is in use, a portion of the gas flows through the opening 8A of the three-way joint 8. The gas flows in the T1 direction of the detection circuit 9, and further flows into the tube 10 from the upper side of the detection tube 10, and the gas pressure presses the ball valve 13 installed inside the detection tube 10 toward the lower valve seat 11A. Gas flow is shut off. Therefore, during normal gas use, the ball valve 13 in the detection tube 10 is always located on the valve seat 11A side. Next, when you finish using the gas appliances 3A to 3E, that is, when you go to bed at home or when you finish work at a factory, etc., operate the handle 7H of the switching cock 7 to close the oral cavity 7B side. , the inflow of gas into the connecting pipe 6 side is closed, the main supply path 1A side and the diameter portion 7A of the switching cock 7 are communicated, and the gas is allowed to flow into the detection circuit 9 in the T2 direction.

At this time, if the cocks 4A to 4E of each gas appliance 3A to 3E are completely tightened, the switching cock 7 and subsequent ones, that is, the connecting pipe 6
The gas pressure in the T1 direction and the gas pressure in the T2 direction in the detection circuit 9 are equally balanced, and the ball valve 13 in the detection tube 10 contacts the valve seat 11A to detect gas from the T2 direction. Flow into the tube 10 is prevented. Therefore,
When the handle 7H is operated to close the gas supply to the connecting pipe 6 and communicate with the detection circuit 9, if the ball valve 13 is located on the valve seat 11A side, the cock 4A of each gas equipment 3A to 3E is closed. It is possible to confirm that the operation is being carried out reliably by the deadline of ~4E, and safety can be ensured.

Next, among the gas appliances 3A to 3E, for example, gas "equipment 3"
If the cock 4B of B is forgotten to be tightened and is in a half-tight state, the gas pressure on the T1 side will decrease and the equilibrium state with the gas pressure on the T2 side will be broken, and the gas on the T2 side will move upward through the ball valve 13. The gas flows into the pipe 10, and the ball valve 13 is further pushed up, and the ball valve 13 is pressed against the valve seat 11B provided on the upper side to close the upper mouth end and prevent the flow of gas. . Therefore, by detecting that the ball valve 13 has floated toward the valve seat 11B, it is possible to confirm that there is an abnormality in the gas appliances 3A to 3E, and to ensure that the ball valve 13 is stabilized on the conical valve seat 11B. By abutting in this state, the upper mouth end of the detection tube 10 can be reliably closed and gas leakage can be prevented, and accidents can be immediately prevented. By providing a detection circuit, it is possible to detect not only operational errors as described above, but also equipment failures, piping leaks, and the like.

In addition, it is possible to centrally manage operational errors, equipment failures, piping leaks, etc. of the gas equipment 3A to 3E that are disposed in a variety of locations in one place, which is convenient because maintenance inspections and patrol inspections can be carried out efficiently. . Furthermore, for centralized control, the shutoff valve 5 of this embodiment is not used only for the main valve, but for example, when piping is arranged in a rotary shape, the shutoff valve 5 may be provided independently in each branch circuit. In this example, city gas or propane gas is used as the fluid, and a shutoff valve 5 is attached to the supply circuit thereof, but the present invention can also be used in supply circuits of other fluid devices, etc.

Alternatively, an electric circuit may be provided on the upper valve seat 11B side to issue an alarm when the ball valve 13 closes the valve seat 11B. Further, in this example, the detection tube 10 is provided vertically, but is not limited to this, and may be provided horizontally, for example. The present invention is a shutoff valve with a fluid leak detection device installed in a main supply path that supplies fluid fuel to a large number of combustion devices, and a switching cock is provided on the inflow side of a connecting pipe connecting the main supply path. A three-way joint is provided on the outflow side, and a detection circuit is provided between the switching cock and the three-way joint in a substantially inverted U-shaped bypass with respect to the main supply path, and is close to the switching cock of the detection circuit. A transparent detection tube having a conical valve seat at both ends is inserted, and a ball valve capable of closing the valve seat and floating is enclosed within the detection tube, and the switching cock is operated. The main supply path is switched and connected to the detection circuit side through the switch, and when normal, the ball valve closes the conical valve seat on the switching cock side, and when abnormal, the ball valve closes the conical valve seat on the other side. By adopting a structure that closes the ball valve, when a pressure difference occurs in the detection circuit, the ball valve is displaced and stably contacts the conical valve seat on the downstream side of the fluid flow, so that it is reliably closed. Fluid leakage can be detected by the displacement of the ball valve, and the conical valve seat can be reliably closed to prevent fluid from flowing out to the fluid equipment side, thereby preventing accidents from occurring.

Therefore, for example, by installing it in the main supply pipes of various fluid devices, it is possible to detect and prevent fluid leaks due to operational errors or device failures, and centrally manage each device. It is possible to improve the effectiveness of maintenance inspections and patrol inspections and prevent accidents from occurring, and the structure and installation are extremely simple, so it can be extremely useful as a shutoff valve with a fluid leak detection device.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic piping diagram, and FIG. 2 is an enlarged sectional view of a detection tube. 1... Main supply path, 3A to 3E... Gas equipment, 5...
・Shutoff valve with fluid leak detection device, 6... Connection pipe, 7...
・Switching cock, 8... Three-way joint, 9... Detection circuit,
10...Detection tube, 11A, 11B...Valve seat, 13.
··valve.

Claims (1)

[Claims] 1. A shutoff valve with a fluid leak detection device installed in a main supply path that supplies fluid fuel to a large number of combustion devices, with a switching cock provided on the inflow side of the connecting pipe connecting the main supply path, and a switching cock installed on the outflow side. is provided with a three-way joint, and a detection circuit is provided between the switching cock and the three-way joint in a substantially inverted U-shaped bypass with respect to the main supply path, and a detection circuit is provided at both ends close to the switching cock of the detection circuit. A transparent detection tube having a conical valve seat is interposed, and a ball valve capable of closing the valve seat and floating is enclosed within the detection tube, and the main valve is connected to the main body through the switching cock. The supply path is switched and connected to the detection circuit side, and when normal, the ball valve is switched and the conical valve seat on the cock side is closed.
A shutoff valve with a fluid leak detection device, characterized in that the ball valve is configured to close a conical valve seat on the other side in the event of an abnormality.