Emerson CASH A-401 Installation Instructions Manual

CASH TYPE A-401 CRYOGENIC PRESSURE REGULATOR

InstallatIon InstructIons

Before installation, these instructions must be fully read and understood.

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.

Emerson.com/FinalControl © 2018 Emerson. All rights reserved. VCIOM-10805-EN 18/11

CASH TYPE A-401 CRYOGENIC PRESSURE REGULATOR

InstallatIon InstructIons

BILL OF MATERIALS

Item Quantity Part No. Description Material

1 1 18524 Adjusting Screw SST
2 1 16684 Lock Nut SST
3 1 21500 Spring Chamber Bronze
4 1 08225 Spring Button Brass
5 1 13399 Name Plate Aluminum
6 2 02533 Drive Screw SST
7 1 - - - - Pressure Spring SST
8 1 08243 Diaphragm Stop Brass
9 1 12003 Gasket Teflon
10 1 22048 Diaphragm Sub - - - ­10a 1 07999 Nut SST
10b 1 10993 Washer SST
10c 1 22062 Pressure Plate Brass
10d 4 16586 Diaphragm Bronze
10e 1 12002 Gasket Teflon
10f 1 21956 P-Post Button SST
11 1 22173 Piston Sub - - - ­11a 1 22174 Piston Brass
11b 1 21510 Seat Disc Teflon
12 1 06711 Spring SST
13 1 21518 Gasket Gylon
14 1 21970 Bottom Plug Brass
15 4 21517 Screw SST
16 1 21507 Body Bronze

FIGURE 1

PB INLET

PB OUTLET

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Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.

Cash 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.

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