CASH VALVE FRM / FRM-2 CRYOGENIC BACK PRESSURE OR ECONOMIZER SERVICE

THE ECONOMIZER CIRCUIT

The economizer back pressure regulator is set from 10 to 25 psi (.70 to 1.76 kg/sq cm) above the
set pressure of the pressure build-up regulator. When no gas is being used and heat leakage in
the tank causes a gas pressure build-up, the excess pressure is by-passed into the final vaporizer
line to conserve gas rather than allow the safety valve in the pressure build-up circuit to relieve
the excess gas into the atmosphere.
Five types of back pressure valves are available for this circuit: the Type FRM, low flows,
max. 600 psi (42.18 kg/cm2
FRM-2, medium flows, max. 250 psi (17.58 kg/cm2
FRM-2 (HP) high
pressure, medium flows, max. 400 psi (28.12 kg/cm2
FR, large flows, max. 400 psi (28.12 kg/ cm2 and the FR-6, max. 600 psi (42.18 kg/cm2