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This is a safety valve.It is installed in liquid phase and gas phase pipeline of LPG storage and filling station, and used with air compressor (or gas storage tank), so that in case of a large number of pipeline leakage, the gas source pressure relief or high temperature will melt the alloy of fusible plug, and the valve will automatically close and stop leakage, playing a role of safety protection.The valve can also be used as a pneumatic globe valve.Can realize remote control, close quickly, open flexible.

Product Model: QDQ421F-25/40
Nominal diameter: DN25~200 mm
Nominal Pressure: PN2.5~4.0MPa, JIS-10K, 20K
Applicable Temperature: -40~+80 ℃
Applicable media: liquefied gas, natural gas
Air supply interface: PC1/4
High-temperature dissolution and closure temperature: 70±5℃