Emergency shut-off valve

Emergency shut-off valve

The working principle of emergency shut-off valve:
It is suitable for city gas, liquefied petroleum gas, natural gas and other kinds of gas to make two-position on-off switching for heating and combustion medium pipelines, and the actuator for automatic temperature control.
Normally closed: When the coil is energized, the electromagnet core is attracted, the pressure relief hole is opened, the main piston is pushed by the medium pressure, the main valve port is opened, and the medium flows. When the coil is de-energized, the main valve port is closed and the medium is cut off.
Normally open: When the coil is energized, the electromagnet core is closed, the pressure relief hole is closed, the main piston is pushed by the medium pressure, the main valve port is closed, and the medium is cut off. When the coil is de-energized, the main valve port is opened and the medium flows.

Application of emergency shut-off valve:
1. It is connected with the combustible gas leakage monitoring instrument. When the instrument detects the leakage of combustible gas, it will automatically and quickly close the main gas supply valve, cut off the supply of gas, and prevent the occurrence of malignant accidents in time.
2. It is connected with the limit temperature (pressure) safety controller of the thermal equipment. When the temperature (pressure) of the detection point in the equipment exceeds the set limit value, the gas supply valve will be automatically and quickly closed to stop the supply of fuel.
3. It is connected with the central fire alarm system of high-rise buildings. When a fire occurs in the building, it will automatically cut off the gas supply in the building to prevent the occurrence of gas explosion.
4. A ZCR gas emergency shut-off valve is installed in the gas supply pipeline network of the city or factory, which can be centrally controlled in the central control room, and the pipeline gas supply at the accident site can be shut down remotely by remote control.

Advantages of emergency shut-off valve:
Emergency shut-off valves feature low load loss and high reliability. It is suitable for combustible gases such as coal gas, natural gas and liquefied petroleum gas, and is widely used in the safety facilities of gas supply pipe network system, gas thermal energy factory workshop, gas boiler room and residential residence. The gas emergency shut-off valve is a normally open pulse-triggered solenoid valve, which has the functions of self-locking and manual reset.

Emergency shut-off valve classification:
Spring slam shut valve
The spring emergency shut-off valve is to close the valve or open the valve in an emergency after power failure. Its working principle is: after the electric spring emergency shut-off valve is energized, the coil spring in the motor electric actuator transmits the torque force to the coil. On the spring, the coil spring releases the torque stored in it when the power is off, driving the valve to close or open quickly. Its advantage is that it closes quickly, and the closing time only takes 1-2S.
Storage capacitor emergency safety valve
The storage capacitor emergency safety valve is equipped with a storage capacitor energy storage device inside the actuator. When the actuator is energized and operates normally, the storage capacitor is charged. When the power is off, the storage capacitor releases electric energy, which drives the motor and gear device to open and close the valve.
Its advantages are: the charging and discharging time of the storage capacitor is short, and the life time is long.
The electromagnetic valve
Solenoid valve is a new type of safety supporting device for gas pipeline engineering.

Related technical parameters of emergency shut-off valve:

1. Applicable to coal gas, natural gas and liquefied petroleum gas.
2. Valve specifications: threaded connection G1/2", G3/4", G1"; flange connection DN25～350.
3. Working pressure: 0.5bar～6bar.
4. Electrical protection grade: CEI IP65/IP67.
5. Explosion-proof grade: Eexm Ⅱ T4/ Eexm Ⅱ T5.
6. Working voltage and electric power: AC24V or 220V, 50Hz/14V; DC AC12V/8.5W, AC24V/8.5W.
7. Working temperature: -15～60℃.
8. Sealing material: NBR rubber.
9. Body material: brass, stainless steel, carbon steel.
10. Valve closing time.

Dimensions of emergency shut-off valve:

Packing & Delivery : 

Packing Details:all by seaworthy plywood case and packed strongly by packing belt as below
Delivery Details:Generally it is 5-10 days if the goods are in stock. or15-30 days if the goods are OEM or not
enough subject to the order quantity. But anyway, normally, we are able to make sure the delivery will not exceed 45days.