Ammonia emergency shut-off valves are suitable for ammonia / gas tanks, pipelines cut off access control safety valve flow. In equipment failure, corrosion damage, seal failure, or in the event of an emergency, to cut off the upstream gas source, to avoid accidents expand the scope of the control effects of the accident, reduce accident losses. "Pneumatic emergency shut-off valve" is equipped with a low melting point (fusible alloys) plug, the outside temperature ≥80 ℃ fusible alloy melting blocked airway pressure relief valve is quickly closed off to ensure the safety of the tank system. "Pneumatic emergency shut-off valve" by a multi-spring pneumatic diaphragm actuator or floating piston actuator and regulating valves, adjust the instrument to receive signals, the control flow within the process pipe cutting, turning or switching. It has a simple structure, responsive, reliable action and so on. It can be widely used in petroleum, chemical, metallurgy and other industrial sectors. Emergency shut-off valve of the gas supply requirements filtered (compressed air) nitrogen. Performance Specifications: Pressure rating: 2.5 / 4.0Mpa cylinder working pressure: 0.3-0.6Mpa temperature: -40 ~ 80 ℃ cylinder using the media: `dry nitrogen atmosphere using medium: natural gas, liquefied petroleum gas, ammonia gas melt closing time : ± 70 ℃ Off Time: ≤5 seconds opening pressure cylinder; ≥0.3-0.6Mpa Body material: cast Gang, stainless steel. 304,316,316L spring: 50CrVA (spring steel) cylinder, piston: ductile iron seals, O-rings: PTFE, NBR Type: pneumatic / normally closed normally open cast rigid / stainless steel more information, see: www.ylfmc.com/shgnvalve-Products-1923025