Bulletin CKV-7867B page 2 of 2
Fuel Tank
Fuel-In
Fuel
Return
Line
CKV2336
Check Valve
Injectors
Injection
Pump
Solenoid
Valve
PRV50/PRV70
Pressure Relief
Valve
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 shut-
down after the solenoid valve closes. The
diagram to the right shows a typical instal-
lation using CKV check valves and PRV
pressure relief valves.
All valves are
shown closed.
C
heck Valves close off the fuel return
line(s) to prevent fuel or air from re-enter-
ing 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 pres-
sure 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
+1 281 633 4500
fax
+1 281 633 4588
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje
San Luis Potosí, S.L.P.; México 78384
+52 444 8206264
fax
+52 444 8206336
Villahermosa 52 993 3162117
www.murphymex.com.mx
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055
fax
+44 1722 410088
www.fwmurphy.co.uk
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700
fax
+1 661 947 7570
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
+61 3 9358 5555
fax
+61 3 9358 5558
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax
+1 918 317 4266
www.fwmurphy.com
R
E
G ISTERE
D
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
Printed in U.S.A. 0287520
