JP4017280B2 - Fluid supply cutoff equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a shut-off valve that shuts off the flow of fluid supplied through the fluid supply path on the upstream side of the pressure regulator provided in the fluid supply path, and shuts off the shut-off valve with fluid pressure. An actuating means is provided to operate, the fluid pressure of the fluid supply path is introduced into the actuating means, and the shutoff valve is actuated to a shut-off state with the introduced fluid pressure when the fluid pressure exceeds a set pressure. The present invention relates to a fluid supply cutoff facility.
[0002]
[Prior art]
For example, in the conventional gas supply facility, as shown in FIG. 8, the conventional fluid supply cutoff facility is supplied to the upstream side of the pressure regulator 1 provided in the fluid supply passage A through the fluid supply passage A. A shut-off valve 2 that shuts off the flow of fluid and an actuating means 3 that actuates the shut-off valve 2 in a shut-off state with a fluid pressure are provided. The secondary side fluid pressure P2 is connected to the fluid supply path A so as to introduce the secondary side fluid pressure P2, and the primary side fluid pressure P1 in the primary side pipe 5 upstream of the pressure regulator 1 rises abnormally, or the pressure regulator When the secondary fluid pressure P2 exceeds the set pressure as a result of the failure of 1 and the secondary fluid pressure P2 cannot be adjusted to the predetermined pressure, the secondary valve pressure P2 activates the shutoff valve 2 in the shutoff state. It is configured to make it.
[0003]
[Problems to be solved by the invention]
In the above conventional fluid supply shut-off equipment, the primary fluid pressure rises abnormally, or the pressure regulator fails and the secondary fluid pressure cannot be adjusted to the specified pressure. Since the shut-off valve will not operate in the shut-off state unless it becomes, the disadvantage that the shut-off valve cannot be operated in the shut-off state as necessary regardless of changes in the primary fluid pressure or the secondary fluid pressure. There is.
The present invention has been made in view of the above circumstances, and when the secondary fluid pressure becomes equal to or higher than the set pressure, the shut-off valve is shut off as necessary while allowing the shut-off valve to be operated in the shut-off state. The purpose is to be able to operate in a state.
[0004]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a shut-off valve for shutting off a flow of fluid supplied through the fluid supply path on the upstream side of the pressure regulator provided in the fluid supply path. Is provided with an operating means for operating a fluid pressure in a shut-off state, the fluid pressure of the fluid supply path is introduced into the operating means, and when the fluid pressure exceeds a set pressure, the shut-off valve is shut off with the introduced fluid pressure. A fluid supply shut-off device configured to operate in a state, wherein the set pressure is set to a pressure lower than a fluctuation range of a primary fluid pressure upstream of the pressure regulator, and the primary fluid pressure Is introduced into the actuating means, and a first state in which the shut-off valve is actuated in the shut-off state with the introduced primary fluid pressure, and a secondary fluid pressure downstream of the pressure regulator is introduced into the actuating means. The introduced secondary fluid pressure Vibration detecting means but which detects becomes more than the set pressure, and freely switching means switched alternatively to the second state to operate the shut-off valve to cut-off state introduced secondary side fluid pressure, the vibration of an earthquake And a control means for controlling the switching means to switch to the first state when the vibration detecting means detects a vibration equal to or higher than a set acceleration .
[0005]
[Action]
When the secondary fluid pressure is introduced into the operating means, and the secondary fluid pressure exceeds the set pressure , the switching means is switched to the second state in which the shut-off valve is operated in the shut-off state with the introduced secondary fluid pressure. Therefore, as before, the primary fluid pressure upstream of the pressure regulator will rise abnormally and the pressure regulator will not function properly.As a result, the secondary fluid pressure will exceed the set pressure. Then, the shut-off valve operates in the shut-off state.
In addition, since the set pressure for operating the shut-off valve in the shut-off state is lower than the fluctuation range of the primary fluid pressure, the primary fluid pressure is introduced into the operating means, and the shut-off valve is shut off with the introduced primary fluid pressure. When the switching means is switched to the first state that is activated to the state, the cutoff valve is activated to the cutoff state.
In addition, when the vibration detection unit detects a vibration greater than the set acceleration, the control unit controls the switching unit to switch to the first state.
[0006]
〔effect〕
Therefore, by switching the switching means to the second state, when the secondary fluid pressure becomes equal to or higher than the set pressure, the switching means can be switched to the second state as necessary while allowing the shut-off valve to be operated to the shut-off state. By switching to the 1 state, the shut-off valve can be operated in the shut-off state.
In addition, when an earthquake with vibration exceeding the set acceleration occurs, the shutoff valve is quickly activated to shut off, and if the fluid supply path on the downstream side of the shutoff valve is damaged, fluid from the damaged part The outflow can be suppressed and the occurrence of secondary disasters can be prevented.
[0007]
[0008]
[0009]
[0010]
According to a second aspect of the present invention, the operating means is configured to operate the shut-off valve in a shut-off state by moving a diaphragm with the fluid pressure, and in the first state, the pressure regulator and the The primary fluid pressure between the shut-off valve is introduced into the operating means.
[0011]
[Action]
When the switching means is switched to the first state, the primary fluid pressure between the pressure regulator and the shut-off valve is introduced into the actuating means, and the shut-off valve is actuated in the shut-off state by moving the diaphragm with the primary fluid pressure. As a result, no fluid is supplied between the pressure regulator and the shut-off valve, so that the primary fluid pressure acting on the diaphragm decreases.
[0012]
〔effect〕
Therefore, the high primary fluid pressure does not act on the diaphragm for a long period of time until the next shut-off valve is opened, and the deterioration of the durability of the diaphragm can be prevented.
[0013]
According to a third aspect of the present invention, when the primary fluid pressure introduced into the actuating means exceeds an allowable pressure higher than the set pressure, the fluid between the pressure regulator and the shut-off valve A relief valve is provided in the fluid supply path on the downstream side of the regulating valve.
[0014]
[Action]
When the primary fluid pressure introduced into the actuating means exceeds the allowable pressure higher than the set pressure, the fluid between the pressure regulator and the shutoff valve escapes to the fluid supply path on the downstream side of the pressure regulator, and enters the actuating means. The introduced primary fluid pressure decreases.
[0015]
〔effect〕
Accordingly, the diaphragm can be prevented from being damaged due to excessive fluid pressure acting on the diaphragm.
[0016]
According to a fourth aspect of the present invention, the switching means supplies a primary fluid between the pressure regulator and the shutoff valve to the operating means, and the primary fluid pressure is supplied to the operating means. The first state to be introduced and the second state in which the secondary fluid downstream of the pressure regulator is supplied to the operating means and the secondary fluid pressure is introduced to the operating means are alternatively switched. The valve box forming member, which is composed of a free three-way valve and forms the valve box of the three-way valve, includes a valve box of the relief valve, a fluid outlet valve hole of the three-way valve, and a fluid inlet of the relief valve And a relief passage for allowing excess fluid in the communication passage to escape from the relief valve to the fluid supply passage.
[0017]
[Action]
By switching the three-way valve to the first state, the primary fluid between the pressure regulator and the shutoff valve is supplied to the operating means, and the shutoff valve is actuated in the shutoff state by the primary fluid pressure, and the primary side When the fluid pressure exceeds the allowable pressure, excess fluid in the communication passage escapes from the relief valve to the fluid supply passage on the downstream side of the pressure regulator, the primary fluid pressure introduced into the operating means decreases, and the three-way valve is By switching to the state, the secondary fluid on the downstream side of the pressure regulator is supplied to the operating means, and when the secondary fluid pressure exceeds the set pressure, the shut-off valve operates in the shut-off state.
And, in the valve box forming member forming the valve box of the three-way valve, a communication path for communicating the valve box of the relief valve, the fluid outlet valve hole of the three-way valve and the fluid inlet of the relief valve, and a communication path Since the relief flow path that allows excess fluid to escape from the relief valve to the fluid supply path is integrally formed, it is easy to connect the three-way valve and the relief valve so that there is no fluid leakage, and piping work for that is omitted. be able to.
Further, the three-way valve and the relief valve can be connected in a compact manner.
〔effect〕
Therefore, the connection work between the three-way valve and the relief valve can be simplified, and the facility can be downsized.
[0018]
According to a fifth aspect of the present invention, the electromagnetic operation unit is provided with an electromagnetic operation unit that switches the three-way valve and a pressure gauge that detects a fluid pressure in a fluid outlet valve hole of the three-way valve. The switching state display section and the pressure display section provided on the pressure gauge are fixed to the valve box forming member in the same direction.
[0019]
[Action]
Since the electromagnetic operating unit for switching the three-way valve and the pressure gauge for detecting the fluid pressure of the fluid outlet valve hole of the three-way valve, that is, the fluid pressure introduced into the operating means, are fixed to the valve box forming member, The electromagnetic operation unit and the pressure gauge can be compactly assembled to the three-way valve.
Further, since the switching state display part provided in the electromagnetic operation unit and the pressure display part provided in the pressure gauge are fixed in the same direction, the display contents can be confirmed from the same direction.
[0020]
〔effect〕
Accordingly, it is possible to reduce the size of the facility and to easily check the operating state.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts denoted by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
FIG. 1 shows a gas supply shut-off facility provided in a gas supply path A for supplying city gas (an example of fluid). On the upstream side (supply side) of the pressure regulator 1 provided in the gas supply path A, A shut-off valve (slam shut valve) 2 that shuts off the flow of gas supplied through the gas supply path A, and a shut-off valve actuating governor 3 as actuating means for actuating the shut-off valve 2 in a shut-off state by gas pressure And a three-way valve unit 4 for supplying the operating gas to the shut-off valve operating governor 3, and supplying the gas in the gas supply path A to the shut-off valve operating governor 3 through the three-way valve unit 4, The gas pressure of the gas supply path A is introduced into the shut-off valve operating governor 3 so that the shut-off valve 2 is operated in a shut-off state when the gas pressure exceeds a set pressure.
[0022]
The pressure regulator 1 supplies a gas supplied at a pressure of 5 to 6 kg / cm ² (hereinafter referred to as a primary gas pressure) P1 from the primary side pipe 5 of the supply side to a pressure of about 1.5 kg / cm ^2. (Hereinafter referred to as “secondary gas pressure”) It is composed of a main governor that flows to the secondary side pipe 6 on the supply side while adjusting to P2, and the primary side pipe 5 and the secondary side pipe 6 A pilot governor 8 and a throttle valve 9 are provided in the pilot adjustment pipe 7 to be connected, and a pressure detector 8a of the pilot governor 8 is connected to the downstream side of the throttle valve 9 of the pilot adjustment pipe 7 by a pilot governor adjustment pipe 10. A pressure detector 1 a of the main governor 1 is connected by a main governor adjusting pipe 11 between the pilot governor 8 of the pilot adjusting pipe 7 and the throttle valve 9.
[0023]
The main governor 1 is constituted by a normally closed diaphragm type direct acting valve in which the valve body 1b is spring-biased so as to move to the valve closing side when a pressure drop is detected, and the pilot governor 8 has a pressure drop. When the valve is detected, the valve body 8b is spring-biased so as to move to the valve opening side, and is constituted by a normally open diaphragm type direct acting valve.
[0024]
When the valve body 8b of the pilot governor 8 moves to the valve opening side as the secondary gas pressure P2 in the secondary pipe 6 decreases, the primary governor 1 is connected to the main governor 1 through the pilot adjustment pipe 7. The amount of gas supplied to the pressure detector 1a increases and the detected pressure rises, the valve body 1b of the main governor 1 moves to the valve opening side, and the gas flows from the primary side pipe 5 to the secondary side pipe 6 When the valve body 8b of the pilot governor 8 moves to the valve closing side as the secondary gas pressure P2 in the secondary pipe 6 increases and the amount increases, the pressure detector 1a of the main governor 1 A state in which the amount of gas supplied decreases and the detected pressure decreases, the valve body 1b of the main governor 1 moves to the valve closing side, and the amount of gas flowing from the primary side pipe 6 to the secondary side pipe 7 decreases. Thus, the secondary gas pressure P2 is adjusted to a substantially constant pressure.
[0025]
As shown in FIG. 2, the three-way valve unit 4 includes an electromagnetic operation unit 14 that switches the three-way valve 12 to a rectangular-shaped metal valve box forming member 13 that forms the valve box of the three-way valve 12; The pressure gauge 15 for detecting the gas pressure in the gas outlet valve hole 17 of the three-way valve 12 is fixed, and the switching state display portion 14 a provided in the electromagnetic operation unit 14 and the pressure provided in the pressure gauge 15 are configured. The display unit 15a is oriented in the same direction.
[0026]
As shown in FIGS. 3 to 5, the valve box forming member 13 includes a primary side gas inflow valve hole 17 through which the gas from the primary side pipe 5 flows into the three-way valve 12 and the secondary side pipe 6. A secondary gas inflow valve hole 18 through which gas flows into the three-way valve 12, a gas outflow valve hole 16 through which gas flows out from the three-way valve 12 to the shutoff valve operating governor 3, and a gas outflow valve hole 16 When the gas pressure exceeds the allowable pressure (4 kg / cm ² in this embodiment), the valve box of the relief valve (check valve) 20 that releases the gas in the gas outlet valve hole 16 to the secondary gas inlet passage 18 , A communication passage 19 that connects the gas outlet valve hole 16 and the gas inlet of the relief valve 20, and an escape passage 21 that releases excess gas in the communication passage 19 from the relief valve 20 to the secondary gas inlet valve hole 18. And the female thread portion 21 for connection of the pressure gauge 15 are integrally formed by cutting.
[0027]
As shown in FIGS. 4, 6, and 7, the three-way valve 12 includes a primary side opening 23 in which the primary gas inflow valve hole 17 opens and a secondary side in which the secondary gas inflow valve hole 18 opens. The three side openings 24 are concentrically formed along the thickness direction of the valve box forming member 13 and are cut and formed on the front and back, and are inserted into the valve box forming member 13 so as to be reciprocally movable in the thickness direction. A first valve body 26 that can freely open and close the primary side gas inflow valve hole 17 and a second valve body 27 that can open and close the secondary side gas inflow valve hole 18 are provided across the pin 25, for gas outflow. A communication passage 28 for communicating the valve hole 16 with the primary side opening 23 and the secondary side opening 24 is cut and formed, and compressed between a cap 29 screwed and fixed to the valve box forming member 13 and the first valve body 26. The coil spring 30 is mounted, and the electromagnetic operation unit 14 is screwed into the secondary opening 24 and fixed. The primary side gas inflow valve hole 17 is connected to the primary side pipe 5 between the main governor 1 and the shut-off valve 2 by the primary side gas inflow pipe 31, and the secondary side gas inflow valve is configured. The hole 18 is connected to the secondary side pipe 6 on the downstream side of the main governor 1 by the secondary side gas inflow pipe 32.
[0028]
In the electromagnetic operation unit 14, the movable shaft member 33 is retracted in the non-energized state, and the first valve body 26 is moved to the primary side gas inflow valve by the urging force of the compression coil spring 30 as shown in FIG. 6. While the hole 17 is closed, the second valve element 27 opens the secondary gas inflow valve hole 18 to communicate with the gas outflow valve hole 16, and in the energized state in which the solenoid is excited, the movable shaft member 33 is a compression coil. As shown in FIG. 7, the first valve body 26 opens the primary-side gas inflow valve hole 17 and protrudes toward the first valve body 26 against the urging force of the spring 30 to open the gas outflow valve hole. 16 and the second valve element 27 operates to close the secondary gas inflow valve hole 18.
[0029]
The pressure detector 3a of the shut-off valve operating governor 3 is connected to the gas outlet valve hole 16 of the three-way valve 12 by a working gas introduction pipe 34, and moves integrally with a diaphragm 35 having a pressure resistance of about 4 kg / cm ^2. When the gas pressure introduced into the pressure detector 3a is less than the set pressure (2 kg / cm ² in this embodiment) by operating the valve body of the shut-off valve 2 with the operating shaft 36, the shut-off valve 2 is opened. When the pressure exceeds the set pressure, the diaphragm 35 moves against the biasing force of the spring 37, the operating shaft 36 slides, the valve body of the shutoff valve 2 moves to the shutoff position, and the shutoff valve 2 is shut off. It is configured to be held in a state.
[0030]
Therefore, the three-way valve 12 supplies the primary gas between the main governor 1 and the shutoff valve 2 to the shutoff valve operating governor 3 and introduces the primary gas pressure P1 into the shutoff valve operating governor 3. The first state and the second state in which the secondary gas downstream of the main governor 1 is supplied to the shut-off valve operating governor 3 and the secondary gas pressure P2 is introduced into the shut-off valve operating governor 3 is selected. When the primary side gas pressure P1 introduced into the shut-off valve operating governor 3 exceeds the allowable pressure higher than the set pressure in the first state, the relief valve 20 is configured as a switching means that is freely switchable. The primary side gas between the main governor 1 and the shutoff valve 2 is configured to escape to the secondary side pipe 6 on the downstream side of the main governor 1 through the secondary side gas inflow pipe 32.
[0031]
The electromagnetic operation unit 14 is configured to switch to an energized state when an energization command is input wirelessly or by wire from a management center B that manages the supply area of the gas supply path A. An accelerometer 38 is installed as a vibration detection means for detecting earthquake vibrations.
[0032]
The accelerometer 38 is connected so as to transmit detection information to the management center B by wireless or wired communication means 39, and the control device 40 as control means installed in the management center B is based on the detection information. It is determined whether or not a vibration exceeding the set acceleration is detected. If it is determined that a vibration exceeding the set acceleration is detected, it is determined that an earthquake of a predetermined scale has occurred and an energization command is input to the electromagnetic operation unit 14. Then, the three-way valve 12 is switched to the first state.
[0033]
Therefore, when the secondary gas pressure P2 is normally introduced into the pressure detection unit 3a of the shutoff valve operating governor 3, if the secondary gas pressure P2 abnormally rises above the set pressure, the shutoff valve 2 is shut off. When an earthquake of a predetermined scale occurs, the primary gas pressure P1 is introduced into the pressure detector 3a of the shutoff valve operating governor 3, and the shutoff valve 2 is forced into the shutoff state. The switching is held.
[0034]
[Other Embodiments]
1. The fluid supply shut-off facility according to the present invention may shut off the supply of fluids such as industrial gas other than city gas and tap water.
2. The fluid supply shut-off facility according to the present invention may be provided with an operating means for operating the shut-off valve in a shut-off state with a piston that moves when a fluid pressure higher than a set pressure acts.
3. The fluid supply shut-off facility according to the present invention may be configured to introduce the primary fluid pressure upstream of the shut-off valve into the operating means in the first state.
[Brief description of the drawings]
1 is a schematic view of a fluid supply shut-off facility. FIG. 2 is a front view of the main part. FIG. 3 is a cross-sectional view of the main part. FIG. 4 is a view taken along the line IV-IV in FIG. FIG. 6 is a cross-sectional view of the main part explaining the operating state of the three-way valve. FIG. 7 is a cross-sectional view of the main part explaining the operating state of the three-way valve. Schematic [Explanation of symbols]
1 Pressure regulator 2 Shut-off valve 3 Actuating means 12 Switching means (3-way valve)
DESCRIPTION OF SYMBOLS 13 Valve box formation member 14 Electromagnetic operation unit 14a Switching state display part 15 Pressure gauge 15a Pressure display part 16 Fluid outlet valve hole 19 Communication path 20 Relief valve 21 Relief flow path 35 Diaphragm 38 Vibration detection means 40 Control means A Fluid supply path P1 Primary fluid pressure P2 Secondary fluid pressure

Claims (5)

Provided on the upstream side of the pressure regulator provided in the fluid supply path is a shut-off valve that blocks the flow of the fluid supplied in the fluid supply path,
An operating means for operating the shut-off valve in a shut-off state with fluid pressure;
A fluid supply shut-off facility configured to introduce the fluid pressure of the fluid supply path into the operating means and to operate the shut-off valve in a shut-off state with the introduced fluid pressure when the fluid pressure becomes a set pressure or higher. Because
The set pressure is set to a pressure lower than the fluctuation range of the primary fluid pressure upstream of the pressure regulator;
A first state in which the primary fluid pressure is introduced into the actuating means, and the shut-off valve is operated in a shut-off state with the introduced primary fluid pressure; and a secondary fluid pressure on the downstream side of the pressure regulator. When introduced into the actuating means and the introduced secondary fluid pressure becomes equal to or higher than the set pressure, the second state is selected as the second state in which the shut-off valve is operated in the shut-off state with the introduced secondary fluid pressure. Switchable switching means ;
Vibration detection means for detecting earthquake vibrations;
A fluid supply cutoff facility provided with a control means for controlling the switching means to switch to the first state when the vibration detecting means detects a vibration greater than a set acceleration . The actuating means is configured to actuate the shut-off valve by moving a diaphragm with the fluid pressure;
Wherein in the first state, claim 1 Symbol placement of the fluid supply shut off facility primary side fluid pressure is arranged to introduce into said actuating means between said pressure regulator and said shut-off valve. When the primary fluid pressure introduced into the actuating means exceeds an allowable pressure higher than the set pressure, the fluid between the pressure regulator and the shutoff valve is released to the fluid supply path downstream of the pressure regulator. The fluid supply shut-off facility according to claim 2, wherein a relief valve is provided. A first state in which the switching means supplies a primary fluid between the pressure regulator and the shutoff valve to the operating means and introduces the primary fluid pressure to the operating means; and the pressure regulator A downstream secondary fluid is supplied to the actuating means, and the secondary fluid pressure is constituted by a three-way valve that can be selectively switched to a second state of introducing the secondary fluid pressure into the actuating means,
A valve passage forming member that forms the valve box of the three-way valve, a communication passage that communicates the valve box of the relief valve, the fluid outlet valve hole of the three-way valve, and the fluid inlet of the relief valve; 4. A fluid supply shut-off facility according to claim 3, wherein a relief flow path for allowing excess fluid in the communication path to escape from the relief valve to the fluid supply path is integrally formed. An electromagnetic operation unit for switching the three-way valve and a pressure gauge for detecting a fluid pressure in a fluid outlet valve hole of the three-way valve are provided in the switching state display section provided in the electromagnetic operation unit and the pressure gauge. The fluid supply shut-off facility according to claim 4 , wherein the pressure display unit is fixed to the valve box forming member in the same direction.

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