Flow valve protects from accidental releases
A
Boiswood product story
Edited by the Engineeringtalk editorial team
Oct 10, 2000
Boiswood is now supplying the CTE EFV excess flow valve, designed to protect people and processes from accidents caused by the release of toxic or flammable gases and liquids from high pressure lines
Boiswood, the specialist distributors of components for gas and liquid control, are now supplying the CTE EFV (excess flow valve), designed to protect people and processes from accidents caused by the release of toxic or flammable gases and liquids from high pressure lines.
In the event of a line or fitting failure, excess flow enters the EFV and is directed through a right angle to the outlet port across the nose of a magnetic piston.
The piston is held in position by an adjusting screw magnet.
When the pressure differential created by flow across the piston is great enough, the piston slides to a seat at the outlet port.
An external adjusting screw can be used to change the flow rate at which the piston actuates.
The piston creates a bubble-tight seal when it makes contact with the seat.
The valve is re-opened by turning a balancing valve handle, which ports the upstream pipeline to the downstream pipeline.
The piston resets when the pressure is equalised on each side of it.
Closing the balancing valve returns the unit to normal operation.
A range of models is available in brass and stainless steel to accommodate pressures up to 6000 PSIG.
Controlled bleed and positive shut-off versions are also available.
The maximum operating temperature is 104C.
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