Rapid pneumatic cut-off valve for emergency when necessary

In some industrial occasions, such as chemical industry, petrochemical industry, need emergency cut-off valve, to ensure the requirements of control, or play a role to protect the system, then you need to quickly pneumatic cut-off valve. Rapid pneumatic cut-off valve requirements cut off time is short, so the actuator demand is higher, electric valve, such as electric ball valves, electric butterfly valve for opening and closing time is long, generally not suitable for the occasion, pneumatic ball valves, pneumatic butterfly valve is one of the more appropriate choice, if deserve to go up quick exhaust valve, can be in 1 - completely 2 seconds to realize rapid opening and closing of the valve. And fertilizer plant commonly used pneumatic program-controlled cut-off valve, cut-off valve is also very demanding, the SPC valve piston cylinder is used the higher air pressure to drive can be used. If the air pressure is low, Less than zero. 3MPa） , the choice of pneumatic butterfly valve, pneumatic ball valves, pneumatic cut-off valve is not line, then you can choose pneumatic membrane cut-off valve, the selection of differential pressure is small single-seat pneumatic film cut-off valve, pneumatic pressure difference is larger selection of film sleeve cut-off valve. In addition if need reversing, cut-off valve and pneumatic membrane tee can choose. If there is no air source field, can only use electric control, that there are two options: DMF - 1 electromagnetic gas safety shut-off valve and solenoid valve, the former applies pressure is lower, so can only be used for specific occasions, solenoid valve, from low to high pressure can choose. There is a hydraulic or electro-hydraulic linkage butterfly valve or ball valve, can achieve less than 0. Very fast 5 seconds is cut off, can satisfy the requirement of more rapidly cut off.