Murphy PRV70, CKV1WPS, CKV2336, PRV50 User Manual

CKV-7867B/N

Revised 11-04

Catalog Section 55

(00-02-0121)

Diesel Fuel Check Valves

CKV and PRV Series

■

Problem Solvers for Diesel Engine
Shutdown Systems

■

Precision Made

■

Stainless Steel Spring

■

Compact and Simple to Install

Description

Murphy offers two types of diesel fuel line
valves: check valves and pressure relief
valves.

The CKV series check valves are in-line,
one-way valves that prevent fuel from being
siphoned back into an injector or injection
pump which could delay a shutdown.

There are two types of check valves:
CKV2336 and CKV1WPS. The CKV2336
has a 1/4 NPT threaded male connection on
each end for connecting to fuel line fittings
or hoses. The CKV1WPS check valve is typi­cally mounted in the fuel bypass line of the
last fuel injector. The CKV1WPS features a
hollow bolt connection and a barbed, 1/8
NPT connection for flex hose or fitting.

The PRV series pressure relief valves,
relieve overpressure in a fuel system usually
caused by closing of a solenoid fuel valve.

The PRV50 and PRV70 have a 1/4 NPT
threaded connection on each end for con­necting to fuel line fittings or hoses.

Specifications

Materials

Body Seal Spring

CKV2336 Brass Poppet SS

CKV1WPS Brass SS SS

PRV50/PRV70 Brass SS SS

Note: SS=Stainless steel.

Opening Pressure

Opening Fully Opened

CKV2336 1 psi (7) 4 psi (27)

CKV1WPS 1.4 psi (10) 2 psi (14)

PRV50 17 psi (117) 25 psi (172)

PRV70 10 psi (69) 70 psi (483)

Note: metric (kPa) equivalents in parenthesis.

Static Pressure (all):

150 psi (1.03 MPa) maximum

Weight

CKV2336: 1.3 oz (40.5 grams)
CKV1WPS: 1.3 oz (40.5 grams)
PRV50/PRV70: 1.3 oz (40.5 grams)

Dimensions

CKV2336

CKV1WPS

PRV50 and PRV70

1-5/8 in. (41 mm)

1/4 NPT

2-1/4 in. (57 mm)

1/8 NPT

Barbs for
flexible hose

1-1/2 in. (38 mm)

1/4 NPT

21/64 in. (8 mm)
diameter hollow
bolt hole

Bulletin CKV-7867B page 2 of 2

Fuel Tank

Fuel-In

Fuel
Return
Line

CKV2336

Check Valve

Injectors

Injection

Pump

Solenoid
Val ve

PRV50/PRV70
Pressure Relief
Val ve

Fuel Filter(s)

Fuel

Pump

2

3

1

CKV1WPS

Check Valve

Typical Diesel Engine Fuel System Installation

How to Order

Specify model number:

CKV2336
CKV1WPS
PRV50
PRV70

Note: there are no replacement parts.

Basic Operation

Murphy Check Valves and Pressure Relief
Valves enhance at the operation of diesel
engine shutdown valves by reducing the
time required for complete engine shut­down after the solenoid valve closes. The
diagram to the right shows a typical instal­lation using CKV check valves and PRV
pressure relief valves. All valves are

shown closed.

Check Valves close off the fuel return

line(s) to prevent fuel or air from re-enter­ing the injection system through the bypass
line(s). Models CKV2336 (

3

) is an in-line

valve. Model CKV1WPS (

2

) has a 21/64
in. (8 mm) banjo fitting that attaches to the
return line of the final injector. All check
valves allow fuel to flow away from the
injectors but close to prevent fuel from
flowing in the reverse direction.

The PRV50 and PRV70 (

1

) relieve pres­sure buildup in the fuel system that can
cause fuel filter canisters to burst. When the
solenoid valve closes to stop the engine, the
fuel transfer pump will continue to produce
pressure as the engine slows down to stop.
This pressure buildup, if not relieved, can
cause fuel filter canisters or gaskets to leak.
PRV’s are installed in the bypass line from
the fuel filter(s) to the fuel return line.

Warranty

A limited warranty on materials and workmanship is given with this FW
Murphy product. A copy of the warranty may be viewed or printed by
going to www.fwmurphy.com/support/warranty.htm

CONTROL SYSTEMS & SERVICES DIVISION

P.O. Box 1819; Rosenberg, Texas 77471; USA
[phone] fax [phone]

e-mail [e-mail]

MURPHY DE MEXICO, S.A. DE C.V.

Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
[phone] fax [phone]
Villahermosa Office [phone]
e-mail [e-mail]
www.murphymex.com.mx

FRANK W. MURPHY, LTD.

Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
[phone] fax [phone]
e-mail [e-mail]
www.fwmurphy.co.uk

MURPHY SWITCH OF CALIFORNIA

41343 12th Street West
Palmdale, California 93551-1442; USA
[phone] fax [phone]
e-mail [e-mail]
www.murphyswitch.com

In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.

MACQUARRIE CORPORATION

1620 Hume Highway
Campbellfield, Vic 3061; Australia
[phone] fax [phone]

e-mail [e-mail]

FW Murphy

P.O. Box 470248
Tulsa, Oklahoma 74147 USA
[phone]

fax [phone]
e-mail [e-mail]

www.fwmurphy.com

R

E

G

I

S

T

E

R

E

D

USA–ISO 9001:2000 FM 28221

UK–ISO 9001:2000 FM 29422

Printed in U.S.A. 0287520