Emergency shut-off valve is a new type of safety equipment for gas pipeline engineering.
Emergency shut-off valves are mainly used in the following applications:
1. Connect with combustible gas leakage monitoring instrument. When the instrument detects the leakage of flammable gas, it will automatically shut down the main gas supply valve, cut off the gas supply, and stop the occurrence of malignant accidents.
2. Connect with the limit temperature (pressure) safety controller of the thermal equipment. When the temperature (pressure) at the detection point in the equipment exceeds the set limit value, the gas supply valve is automatically closed quickly to stop the fuel supply.
3. Connect with the central fire alarm system of high-rise buildings. When a fire occurs in the building, the gas supply inside the building will be cut off automatically to prevent gas explosion.
4. ZCR gas emergency shut-off valves shall be installed in the gas supply network of the city or factory, which can be centrally controlled in the central control room, and remotely remotely shut down the pipelines at the accident site for gas supply.
The emergency shut-off valve has excellent technical performance, low load loss and high reliability. It is applicable to combustible gas such as gas, natural gas and liquefied petroleum gas. It is widely used in the safety facilities of gas supply pipe network system, gas heat energy factory floor, gas boiler room and residential residence.
Emergency shut-off valve works:
1. The valve is in the normally open state during daily work. The coil of the solenoid valve is in the off state and does not consume power.
2. When an accident occurs, the valve coil is energized instantaneously, triggering the valve to close quickly and entering the self-locking state. Even if the power is removed at this time, the valve is still in a self-locking state and will not be automatically opened again.
3, the valve uses a pilot valve, open easily, even if the pressure reaches 6bar open is also very easy, caliber greater than DN125, the use of lever handles, so that the valve to switch effort, fast.
4. When the staff finishes the accident and manually restarts the valve, the air supply will be resumed. Note: The normally closed emergency shut-off valve with power off can also be provided according to customer requirements.
There are three types of emergency shut-off valves: pneumatic emergency shut-off valves, hydraulic emergency shut-off valves, and gas emergency shut-off valves.
The first type: Pneumatic emergency shut-off valve, also known as pneumatic ball valve, is a kind of actuator in the automation system. It is composed of a multi-spring pneumatic membrane actuator or a floating piston actuator and a regulating valve. It receives signals from the regulating instrument and controls the process. Cut off, switch on or switch off the fluid in the pipeline. With a simple structure, responsive, reliable and so on. Can be widely used in petroleum, chemical, metallurgical and other industrial production sectors. The air supply to the pneumatic shut-off valve requires filtered compressed air. The medium flowing through the valve body should be free from impurities and particles-free liquids and gases.
Pneumatic emergency shut-off valve is a new type of gas pipeline engineering safety supporting device, mainly used in the following occasions:
1. Connect with combustible gas leakage monitoring instrument. When the instrument detects the leakage of flammable gas, it will automatically shut down the main gas supply valve, cut off the gas supply, and stop the occurrence of malignant accidents.
2. Connect with the limit temperature (pressure) safety controller of the thermal equipment. When the temperature (pressure) at the detection point in the equipment exceeds the set limit value, the gas supply valve is automatically closed quickly to stop the fuel supply.
3. Connect with the central fire alarm system of high-rise buildings. When a fire occurs in the building, the gas supply inside the building will be cut off automatically to prevent gas explosion.
4. ZCR gas emergency shut-off valves shall be installed in the gas supply network of the city or factory, which can be centrally controlled in the central control room, and remotely remotely shut down the pipelines at the accident site for gas supply.
Second type: Hydraulic emergency shut-off valve A safety protection valve installed on the liquid-phase and gas-phase pipelines of a liquefied petroleum gas storage tank station, used in conjunction with a long-distance hand-operated oil pump, using a hydraulic control valve to open and close so that When a large number of leaks or even fires occur on the pipeline or storage tank, quickly manually depressurize the hand pump, or the high temperature melts the fusible alloy, and the valve cylinder is automatically depressurized, and the valve is quickly closed to stop leaking and play a role in safety protection.
Hydraulic emergency shut-off valve Double oil pump control multiple valve Working principle: Multiple emergency shut-off valves are controlled by two hand-operated oil pumps. One of the oil pumps works and the shut-off valve is opened by pressing. The other oil pump is spared to prevent the first oil pump from being damaged. The valve cannot work normally. Each needle valve is installed before each emergency shut-off valve, which is controlled by the switch of the needle valve.
The third type: gas emergency shut-off valve The new type of gas pipeline engineering safety supporting device can quickly cut off when there are problems in the gas supply pipeline to avoid accidents. Gas emergency shut-off valve product use:
1. Connect with flammable gas leakage monitoring instruments. When the instrument detects the leakage of flammable gas, the main gas supply valve is automatically closed quickly to cut off the supply of gas, and the occurrence of a malignant accident is stopped in time.
2. Connect to the limit temperature (or pressure) safety controller of the thermal equipment. When the temperature or pressure at the detection point in the equipment exceeds the set limit value, the air supply valve is automatically closed quickly to stop the fuel supply.
3. It is connected with the central fire alarm system of high-rise buildings. When the building is in danger, the gas supply inside the building is automatically cut off to prevent gas explosion.
4. Set gas emergency shut-off valves in the gas supply network of the city or factory, which can be centrally controlled in the central control room, remotely controlled, and emergency shutdown of the pipeline supply at the accident site.
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