Emerson CASH A-401 Manual

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

CASH TYPE A-401 CRYOGENIC PRESSURE REGULATOR

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

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: ½"

Connections: Threaded internal inlet

and outlet.

Body Material: Bronze

Temperature Rating:

-320°F (-195.5°C) to +150°F (65.5°C)

Maximum Initial Pressure: 600 psig (41.4 bar)

INSTALLATION INSTRUCTIONS

The Type A-401 regulator should be installed in

the horizontal position with the spring chamber

upright or down. Install a Y-Type or equivalent

strainer upstream of the Type A-401. 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. In order to

prevent contamination from entering the valve,

an in-line screen is recommended. 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.

After reassembly and before pressurizing the

valve, tighten the adjusting screw to ensure there

is force on the pressure plate. This will help avoid

damage to parts that will cause the valve to leak

and not function correctly.

Refer to section view on the following page for

parts identification. Repair parts can easily be

installed without removing the regulator from the

line.

CASH TYPE A-401 CRYOGENIC PRESSURE REGULATOR

INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

Item Quantity Description Material

1 1 Adjusting Screw SST

2 1 Lock Nut SST

3 1 Spring Chamber Bronze

4 1 Spring Button Brass

5 1 Name Plate Aluminum

6 2 Drive Screw SST

7 1 Pressure Spring SST

8 1 Diaphragm Stop Brass

9 1 Gasket Teflon

10 1Diaphragm Sub - - - -

10a 1Nut SST

10b 1Washer SST

10c 1Pressure Plate Brass

10d 4Diaphragm Bronze

10e 1Gasket Teflon

10f 1P-Post Button SST

11 1Piston Sub - - - -

11a 1Piston Brass

11b 1Seat Disc Teflon

12 1Spring SST

13 1Gasket Gylon

14 1Bottom Plug Brass

15 4Screw SST

16 1Body Bronze

BILL OF MATERIALS

INLET OUTLET

FIGURE 1

Solutions business unit of Emerson Electric Co. The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their

prospective 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 Electric Co. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance

of any Emerson Electric Co. product remains solely with the purchaser.

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