Emerson CASH VALVE FRM User manual

CASH VALVE TYPE FRM CRYOGENIC BACK PRESSURE OR ECONOMIZER VALVE
INSTALLATION, MAINTENANCE AND REPAIR PARTS INFORMATION
Before installation, these instructions must be read carefully and understood.
DESCRIPTION
The Type FRM 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. The Type FRM valve is small
and compact, yet is highly efficient making it
suitable for numerous applications that call for
a small, accurate back pressure regulator. The
Type FRM 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
relatively low flows.
Sizes: ¼" or ⅜"
Connections: Threaded female inlet and outlet
connections
Body: Bronze
Maximum Temperature: +150°F (66°C) to
-320°F (-196°C)
Maximum Set Pressure: 600 psi (41 bar)
Shipping Weight: 1⅛ lbs.
Capacity: For specific capacity information,
consult the factory.
CONSTRUCTION
Forged Bronze body; Stainless Steel seat
disc, seat ring and pressure spring; Phosphor
Bronze diaphragms with Teflon diaphragm
gaskets.
All parts commercially cleaned for cryogenic
service.
GENERAL INSTALLATION INSTRUCTIONS
Type FRM valves are available with three
different body styles for pipe connections to
enable it to be adapted to most any system:
side inlet-side outlet, side inlet-bottom outlet, 2
opposite side inlets-bottom outlet.
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
alternitavely 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 valves 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 valves are diaphragm operated
valves designed for the continuous
operating pressure control of a system. All
Type FRM valves are fitted with a diaphragm
travel 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.
Emerson.com/FinalControl © 2019 Emerson. All rights reserved. VCIOM-13802-EN 19/08

2
CASH VALVE TYPE FRM CRYOGENIC BACK PRESSURE OR ECONOMIZER VALVE
INSTALLATION, MAINTENANCE AND REPAIR PARTS INFORMATION
MAINTENANCE INSTRUCTIONS
The following procedures are provided for
servicing the Type FRM back pressure relief
valve. Repair parts can easily be installed
without removing the valve from the line.
CAUTION
Before attempting to replace any spare parts, be
sure to shut off all pressure connections to the
valve. With the valve closed, however, system
pressure could still be locked between the shut
off valve and the inlet and/or outlet sides of the
relief valve. Before proceeding with any valve
service, be certain to relieve the pressure from
BOTH sides of the valve.
Refer to the Type FRM exploded view for parts
identification.
Servicing the Pressure Spring (5),
Diaphragms (11), Seat Disc Gasket (13), Seat
Disc (14) and Seat Ring (15)
1. Loosen the lock nut (2) ¼ turn and turn the
adjusting screw (1) counter-clockwise until
the pressure spring (5) is no longer under
tension.
OPERATING INSTRUCTIONS
Adjusting the Back Pressure
The regulator's back pressure setting is
adjusted by turning the adjusting screw (1) at
the top of the spring chamber after loosening
the adjusting screw lock nut (2). To obtain a
higher pressure setting, turn the adjusting
screw clockwise (into the spring chamber). To
lower the pressure setting, turn the adjusting
screw counter-clockwise (out of the spring
chamber). Tighten the adjusting screw lock nut
after the adjustment has been made and install
the closing cap.
NOTE
When installing the adjusting screw during
reassembly, turn the screw clockwise untl the lock nut
just touches the spring chamber. When the valve is
placed in service, the pressure setting should be very
close to the original setting.
2. Unscrew the spring chamber (3) from the
valve body (16). During reassembly, tighten
the spring chamber securely.
3. Remove the spring seat (4), pressure spring
(5), diaphragm stop (6), and the upper
diaphragm gasket (7) from the valve body.
4. The Diaphragm assembly, consisting of
the pressure plate nut (8), lock washer (9),
diaphragm pressure plate (10), diaphragms
(11), seat disc gasket (13) and seat disc
(14), can now be lifted off the body (16).
Disassemble the parts by unscrewing
the pressure plate nut (8) from the seat
disc (14). Inspect all parts and replace if
necessary. The diaphragm gasket (12) below
the diaphragm should be replaced when
new diaphragms (11) are installed.
IMPORTANT
Excercise care to ensure that the surface of
the seat disc (14) is not scratched, marred or
damaged during disassembly and reassembly.
5. Once the diaphragm assembly has been
removed, the seat ring (15), which is sitting
loosely in a recess of the valve body, can be
removed.
IMPORTANT
Handle the seat ring carefully to avoid damage
to the seat ring surface which contacts the seat
disc (14).
NOTE
Be sure to install the seat disc, with the machined
groove around the outer edge of the flat face, so that
this face is up (away from the body).
6. Inspect all parts and replace if necessary.
Reassemble in reverse order. After placing
the valve back in service, adjust the
delivery pressure setting as detailed under
Operating Instructions.
REPAIR PARTS INFORMATION
Refer to the Type FRM exploded view for parts
identification.
SPECIFICATIONS
Each Type FRM back pressure valve is supplied
with a pressure spring selected to provide
the desired pressure setting. The range of
adjustment or satisfactory "working range"
of individual springs is shown in the table
below for each valve. Each valve has the "set"
pressure and range or adjustment stamped on
a tag fastened to the valve.
SPRING RANGES
SPRING RANGE (psi)
2-25 15-65 40-100 50-100 75-175 100-250 200-400 200-600 300-600

3
CASH VALVE TYPE FRM CRYOGENIC BACK PRESSURE OR ECONOMIZER VALVE
INSTALLATION, MAINTENANCE AND REPAIR PARTS INFORMATION
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance of any product.
Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Cash Valve is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions,
Emerson and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be
construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are governed by
our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such products at any time without
notice.
Emerson.com/FinalControl
FIGURE 1
LIST OF MATERIALS
Item No. Description
1Adjusting Screw
2Lock Nut
3Spring Chamber
4Spring Seat
5Pressure Spring
6Diaphragm Travel Stop
7Diaphragm Gasket
8Pressure Plate Nut
9Lock Washer
10 Pressure Plate
11 Diaphragm
12 Diaphragm Gasket
13 Seat Disc Gasket
14 Seat Disc
15 Seat Ring
16 Body 2-¼"
3-⅜"
½"