Before installation, these instructions must be fully read and understood.
CASH TYPE A-401 CRYOGENIC PRESSURE REGULATOR
InstallatIon InstructIons
Emerson.com/FinalControl © 2018 Emerson. All rights reserved. VCIOM-10805-EN 18/11
DESCRIPTION
The Type A-401 regulator is a fully automatic
pressure regulating valve designed for
cryogenic service in the pressure build-up
circuit. Because it may be used for either
cryogenic liquids or gases, it may be installed
either before or after the pressure build-up
coil.
SPECIFICATION DATA
Service: Cryogenic liquids and gases
(pressure reducing or pressure build-up
service)
Sizes: 1/2"
Connections: Threaded internal inlet
and outlet.
Body Material: ASTM B62 CA836 Bronze
Temperature Rating:
+150°F (339°K) to -320°F (78°K)
Maximum Initial Pressure: 600 psig (41.4 bar)
Capacity: For specific capacity information,
consult the factory.
GENERAL INSTALLATION INSTRUCTIONS
The Type A-401 regulator should be installed
in the horizontal position with the spring
chamber upright or down. For other installation
requirements, consult the factory. For easy
operation and maintenance, it is suggested that
manual shut-off valves be installed upstream
and downstream from the valve. Before
installing the valve, the piping and valve should
be thoroughly flushed out to remove any foreign
material. Install the valve with the inlet pipe
fitted to the inlet connection identified on the
valve body. Use a compatible sealant on the
male pipe threads and do not over-tighten the
valve connections.
CONSTRUCTION
See component description for materials of
construction.
All parts are commercially cleaned for oxygen
service.
OPERATING INSTRUCTIONS
Adjusting the Delivery Pressure
The regulator’s delivery pressure setting is
adjusted by turning the adjusting screw (1)
at the top of the spring chamber (3) after
loosening the adjusting screw lock nut (2).
To increase the delivery pressure, turn the
adjusting screw clockwise (into the spring
chamber). To decrease the delivery pressure,
turn the adjusting screw counter-clockwise (out
of the spring chamber). Tighten the adjusting
screw lock nut after the adjustment has been
made (and reinstall optional cap).
MAINTENANCE INSTRUCTIONS
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
regulator. Before proceeding with any valve
service, be certain to relieve the pressure from
both sides of the regulator.
Refer to section view on the following page for
parts identification. Repair parts can easily be
installed without removing the regulator from the
line.
