CASH VALVE
TYPE FRM-2 CRYOGENIC BACK PRESSURE OR ECONOMIZER VALVE
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Before installation, these instructions must be carefully read and understood.
DESCRIPTION
The Type FRM-2 is designed to function as
a Back Pressure or Economizer valve in
Cryogenic Circuits. The Back Pressure function
is to open at a preset pressure and relieve inlet
pressure to the discharge side into a lower
pressure. The Economizer function is to open
at a preset pressure, above the Pressure Build
set pressure, and continue to open as gas
head pressure from heat leak builds during
non-use periods of the system. The Economizer
by-passes gas head pressure directly to the
Final Line circuit, when system draw resumes,
to draw down the excess pressure rapidly and
recloses before the Pressure Build regulator
opens. These valves are small and compact, yet
highly efficient, making it suitable for numerous
applications that call for a small, accurate back
pressure regulator. Type FRM-2 incorporates a
"floating ring" design that provides for smooth
even pressure control.
SPECIFICATION DATA
Service:
Cryogenic liquids and
gases. Well suited for
use in the Economizer
circuit as a heat leak
economizer valve in
systems
having
medium
flows.
Sizes:
¼" (6.4 mm), ⅜" (9.5 mm)
and
½" (13 mm)
Connections:
NPTF
Body:
Brass
Material:
Brass
Maximum
Temperature:
-320 to 150°F (-195 to 65°C)
Maximum
Set Pressure:
FRM-2: 600 psig (41.4 barg)
CONSTRUCTION
Threaded ends; 2-way, side inlet-side outlet;
2-way, side inlet-bottom outlet; 3-way,
2 side inlets-bottom outlet; brass body;
brass spring chamber; stainless steel seat
disk, seat ring and pressure spring; bronze
diaphragms; Polytetrafluoroethylene (PTFE)
diaphragm gasket.
Also available with stainless steel body, spring
chamber and diaphragms.
All parts commercially cleaned for
cryogenic service.
© 2019 Emerson. All rights reserved.
VCIOM-14770-EN 20/08
INSTALLATION INSTRUCTIONS
When installing the valve, connect the
supply line to the inlet connection. The outlet
connection should be connected to the bypass
or final vaporizer line. Valves with 2 opposite
side inlets and a bottom outlet may be installed
as an angle valve with one inlet plugged, or
alternatively used as an in-line valve with
regulated pressure on both the inlet and
process sides of the valve.
It is recommended that Type FRM-2 valve be
installed in the horizontal position with the
spring chamber upright. For ease of operation
and maintenance, it is suggested that manual
shut-off valves be installed upstream and
downstream from the valve. Use a compatible
sealant on the male pipe threads and do not
overtighten the valve connections.
Other considerations in making a good
installation are:
1. The valve should be sized properly for the
service conditions.
2. Type FRM-2 valve is a diaphragm operated
valve designed for the continuous
operating pressure control of a system.
All series FRM-2 valves are fitted with a
diaphragm stop to prevent the diaphragms
from extending beyond their limit; however,
should a diaphragm fail, the valve will fail in
the closed position. As a safeguard, it may
be desirable to protect the system against
damaging high pressures by a safety relief
valve or some other type of safety device.
