Swagelok XS Series, XS4-3, XS4, XS4-1 Service Instructions Manual

O-ring

Outlet Body

Backup Ring

Spring

Identification Ring

Poppet

Inlet Body

End Connection

End Connection

Body Hex

Body Hex

MS-CRD-0064
Revision 1 6-00-CP

XS Series Excess Flow Valve

Service Instructions

Contents

• Component Identification . . . . . . . . . . . . . . . 1

• Tool Requirements . . . . . . . . . . . . . . . . . . . . 2

• Installation . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

• Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . 3

• Maintenance . . . . . . . . . . . . . . . . . . . . . . . . 3

• Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 6

Valve is shown with Swagelok®tube fitting end connections. These instructions also apply to XS series
valves with pipe ends and with VCR®and VCO®face-seal fitting end connections.

Component Identification

Definitions

Statements and symbols are used in this document
to identify safety concerns. Read the definitions
below before performing the service instructions.

This symbol indicates cautionary
information.

Caution: Indicates a potentially hazardous

situation. It may also be used to
alert against unsafe practices.

Notice: Indicates a statement of company

policy directly or indirectly related to
the safety of personnel or protection
of property.

For Body

Hex

Qty. (1)

2

MS-CRD-0064

Revision 1 6-00-CP

Tool Requirements

Tool size depends on the nominal end connection
size and style. See the table below.

Other Tools

Torque wrench rated to 200 in·lb (22.6 N·m).

Installation

1. Refer to the flow direction arrow on the excess
flow valve and install the valve in the
correct orientation.

IMPORTANT:

Verify proper flow direction when installing.

Inlet

Outlet

2. For valves with Swagelok tube fittings or VCO

®

or VCR®fittings, following the specific fitting
assembly instructions.

3. For valves with pipe fittings or straight thread
fittings, follow standard industry practices.

The flow direction verification card included
with the valve shows the proper flow direction.

Testing

1. Operate at normal flow rate. Create maximum
flow surges. Valve must remain open in both
instances.

2. Vent system line to simulate a break. Valve
must trip (close).

• If valve trips closed, proceed to step 3.

• If valve does not trip closed, replace the

spring with one of the lower-flow springs.
Repeat the Testing procedure.

3. Perform reset test by venting system to trip
valve. Close upstream or downstream valve to
allow the valve to reset. Valve must open and
allow normal flow.

4. Test the valve to ensure there is no leakage to
the atmosphere.

Nominal
End
Connection
Size

Tool Size and Quantity

Wrenches Socket

For Body

Hex Qty. (2)

For End

Connection

Qty. (1)

1/8 in.

11/16 in.

7/16 in.

11/16 in.

1/4 in. 9/16 in.
6 mm 14 mm
3/8 in.

1 in.

11/16 in.

1 in.

1/2 in. 7/8 in.
1/2 in. FNPT

11⁄16 in.

11⁄16 in.

11⁄16 in.

1/2 in.
BSP/ISO

11⁄16

in.

8 mm

1 in.

16 mm

1 in.

12 mm 22 mm

Caution:
Before servicing any installed valve you

must:

• depressurize the system

• purge the valve.

Flow Direction Verification Card