This is a safe protection valve. Installed in pipes of liquid petroleum storage tank, used with air compressor(or storage tank), when pipe leak a lot, air supply reduce pressure or alloy melted, valve automatically close to stop leakage, protect the safety. This valve can also be used as pneumatic cut-off valve, remote control, quick close, flexible open

Working principle and structure instruction

1.       with no air pressure, valve disc is normally closed, when air pump input cylinder pressure air, valve disc open, when need to close valve or emergency situation, should reduce pressure , automatically close

2.       this valve is fixed at valve seat, when pressure air get into cylinder through valve seat, valve disc leave valve seat, when reduced pressure, valve disc quickly close by the action of spring

3.       flow direction of media: valve seat is exit, the other side is entrance