Emergency shut-off valve application
2019-07-17 10:01:55
The pneumatic emergency shut-off valve is a kind of actuator in the automatic system. It consists of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve, and receives the signal of the regulating instrument.
Sales telephone. [Pneumatic emergency shut-off valve] is a kind of actuator in the automation system. It consists of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve. It receives the signal of the regulating instrument and controls the cutting of the fluid in the process pipeline. , switch on or switch. It has the characteristics of simple structure, sensitive response and reliable operation. 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 liquid and gas free of impurities and particles. Single seat, sleeve, and three-way shut-off valves are available depending on the allowable differential pressure, media characteristics, and process piping requirements.
Technical Parameters:
(1) Dimensions, drawings and detailed information, please visit our website (2) Connection form: flange, welding, etc. (3) Transmission mode: manual, pneumatic, electric, self-operated (4) caliber from DN6-DN600; Pressure from 1.0MPA-32MPA; temperature -40°C-450°C
(5) Materials include: carbon steel, stainless steel, ductile iron, gray cast iron and other special steels;
Emergency shut-off valve application:
1. It is connected with the flammable gas leakage monitoring instrument. When the instrument detects the leakage of flammable gas, it automatically closes the main air supply valve quickly, cuts off the supply of gas, and timely stops the occurrence of a vicious accident.
2. It is connected with the limit temperature pressure safety controller of the thermal equipment. When the temperature of the detection point in the equipment exceeds the set limit value, the gas supply valve is automatically closed quickly to stop the supply of fuel.
3. It is connected with the central fire alarm system of the high-rise building. When a fire occurs in the building, the gas supply in the building is automatically cut off to prevent the gas explosion.
4. Set the ZCR gas emergency shut-off valve in the gas supply pipe network of the city or factory, which can be centrally controlled in the central control room, and the remote control emergency shuts off the pipeline supply at the accident site.
Selection of shut-off valve: Selecting the shut-off valve should comprehensively consider various parameters such as leakage rate, medium type, medium temperature, flow coefficient, and cost performance. In the preferred sequence below, a hard seal is considered first, followed by a soft seal.
Reliability of the shut-off valve: 1) Soft seal, good cutting effect, but not suitable for granular media. Once scratched, the leakage will increase sharply. Therefore, a hard seal should be used whenever possible. The "O" type ball valve has a hard seal of up to 10-5, and the triple eccentric butterfly valve can achieve zero leakage.
2) Considerations for seal wear resistance: In addition to hard seal selection, the cut-off type control valve with a leakage requirement of 10-4 or higher must be welded with wear-resistant alloy to improve the wear resistance, erosion resistance and scratch resistance of the seal. The ability to increase the life of the valve.
3) The high-temperature medium shut-off regulating valve is assembled at room temperature, working at high temperature, and the temperature changes by several hundred degrees. Thermal expansion changes the seal specific pressure established during assembly. Too tight, the sealing surface will be stuck, severely bruised and strained during exercise; too loose, insufficient sealing pressure, and the leakage will increase sharply in both cases. The best solution is to use a flexible seat to absorb the difference caused by this change. There are usually three elastic solutions: 1 spring type; 2 sheet flexible metal ring; 3 rigid and flexible elastic seat. The latter is best, both flexible to overcome thermal expansion, and stiffness and surfacing wear-resistant alloys to improve the reliability of the wear surface.
4) For the erosion medium containing particles, consider the direct erosion of the valve core to avoid high-speed medium. 5) For hard seals, there must be sufficient hardness difference, the same hardness material “does not match each otherâ€, it is easy to scratch and cause leakage.
The price of Yongjia Tianhong Valve Manufacturing Co., Ltd. varies by caliber, material, pressure, adjustment accuracy and adjustment range, and the price is not announced! New and old customers can call or fax to consult.
This article is reproduced from: http://
Http://news.chinawj.com.cn Submission:
Sales telephone. [Pneumatic emergency shut-off valve] is a kind of actuator in the automation system. It consists of a multi-spring pneumatic diaphragm actuator or a floating piston actuator and a regulating valve. It receives the signal of the regulating instrument and controls the cutting of the fluid in the process pipeline. , switch on or switch. It has the characteristics of simple structure, sensitive response and reliable operation. 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 liquid and gas free of impurities and particles. Single seat, sleeve, and three-way shut-off valves are available depending on the allowable differential pressure, media characteristics, and process piping requirements.
Technical Parameters:
(1) Dimensions, drawings and detailed information, please visit our website (2) Connection form: flange, welding, etc. (3) Transmission mode: manual, pneumatic, electric, self-operated (4) caliber from DN6-DN600; Pressure from 1.0MPA-32MPA; temperature -40°C-450°C
(5) Materials include: carbon steel, stainless steel, ductile iron, gray cast iron and other special steels;
Emergency shut-off valve application:
1. It is connected with the flammable gas leakage monitoring instrument. When the instrument detects the leakage of flammable gas, it automatically closes the main air supply valve quickly, cuts off the supply of gas, and timely stops the occurrence of a vicious accident.
2. It is connected with the limit temperature pressure safety controller of the thermal equipment. When the temperature of the detection point in the equipment exceeds the set limit value, the gas supply valve is automatically closed quickly to stop the supply of fuel.
3. It is connected with the central fire alarm system of the high-rise building. When a fire occurs in the building, the gas supply in the building is automatically cut off to prevent the gas explosion.
4. Set the ZCR gas emergency shut-off valve in the gas supply pipe network of the city or factory, which can be centrally controlled in the central control room, and the remote control emergency shuts off the pipeline supply at the accident site.
Selection of shut-off valve: Selecting the shut-off valve should comprehensively consider various parameters such as leakage rate, medium type, medium temperature, flow coefficient, and cost performance. In the preferred sequence below, a hard seal is considered first, followed by a soft seal.
Reliability of the shut-off valve: 1) Soft seal, good cutting effect, but not suitable for granular media. Once scratched, the leakage will increase sharply. Therefore, a hard seal should be used whenever possible. The "O" type ball valve has a hard seal of up to 10-5, and the triple eccentric butterfly valve can achieve zero leakage.
2) Considerations for seal wear resistance: In addition to hard seal selection, the cut-off type control valve with a leakage requirement of 10-4 or higher must be welded with wear-resistant alloy to improve the wear resistance, erosion resistance and scratch resistance of the seal. The ability to increase the life of the valve.
3) The high-temperature medium shut-off regulating valve is assembled at room temperature, working at high temperature, and the temperature changes by several hundred degrees. Thermal expansion changes the seal specific pressure established during assembly. Too tight, the sealing surface will be stuck, severely bruised and strained during exercise; too loose, insufficient sealing pressure, and the leakage will increase sharply in both cases. The best solution is to use a flexible seat to absorb the difference caused by this change. There are usually three elastic solutions: 1 spring type; 2 sheet flexible metal ring; 3 rigid and flexible elastic seat. The latter is best, both flexible to overcome thermal expansion, and stiffness and surfacing wear-resistant alloys to improve the reliability of the wear surface.
4) For the erosion medium containing particles, consider the direct erosion of the valve core to avoid high-speed medium. 5) For hard seals, there must be sufficient hardness difference, the same hardness material “does not match each otherâ€, it is easy to scratch and cause leakage.
The price of Yongjia Tianhong Valve Manufacturing Co., Ltd. varies by caliber, material, pressure, adjustment accuracy and adjustment range, and the price is not announced! New and old customers can call or fax to consult.
This article is reproduced from: http://
Http://news.chinawj.com.cn Submission:
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