Excess Flow Valves
EFV Series
Excess Flow Valves are designed for industrial use. In the event of a downstream line rupture, these valves can stop the uncontrolled release of system media.
Features
◎ Compact design for convenient installation
◎ Green ring mounted on the body for easy identification
◎ Variety of end connections available
◎ Working pressure up to 6000 psig (414 bar)
◎ Leak-tight performance testing for every valve with nitrogen at the maximum working pressure
Working Principle
◎ When the system is functioning normally, the poppet remains in the open position.
◎ If the excess flow occurs downstream, the poppet quickly moves to the tripped position to stop the uncontrolled release of system media. At this point, the flow reaching the downstream through the bleed vent is lower than 1% of the flow rate in the trip range.
◎ When system pressure reaches balance through the bleed vent, the spring resets the poppet to the open position automatically.
