SV-99026B page 2 of 2
Things You Should Know
About SV-Series Valves
The SV-Series fuel shutoff valve is intended for use
with diesel engines having externally accessible fuel
injection pumps. The volume of fuel required for the
engine to operate must be able to pass through the
3/16 in. (5 mm) or 1/4 in. (6 mm) orifice of the valve.
You must be able to attach the fuel valve directly onto
or in close proximity to the fuel injection pump in
order to close off fuel flow to the pump.
SV-series
is NOT
intended for use with engines hav-
ing “unit” injectors or distributor type injection
pumps. Use
only
with diesel.
Installation and Service
Suggestions
1.
Make sure the valve is the same voltage as the bat-
tery. Under continuous duty, the coil will normal-
ly be hot, however, incorrect voltage can cause
smoking and burned coils.
2.
The valve will not operate if the flow arrow on
the side of the valve does not indicate the correct
direction of flow.
3.
Do not apply pipe dope to female valve threads.
Dope inside the valve will foul the seat and pre-
vent proper seal.
4.
Install the valve as close as possible to the injec-
tion pump.
Troubleshooting the
SV-Series Valves
Check Control Circuit:
To determine if the elec-
trical system is energizing the solenoid, listen for a
metallic click signifying the solenoid is operating.
Absence of the click indicates loss of power supply.
Check for blown or loose fuses, for an open circuit
or a grounded coil, for broken lead wires or open
splice connections.
Coil Burnout:
Check for open-circuit coil. Replace
coil if necessary.
High or Low Voltage:
Check voltage across the
coil with a voltmeter. Voltage must be in 85% to
110% of nameplate rating.
Incorrect Pressure:
Check fuel line pressure.
Pressure on the valve must be within the specific
range of the SV in use.
Fuel Leak Through Valve:
Disassemble the valve
and clean parts. Replace any parts that are worn or
damaged (see other side for repair parts).
Slow Shutdown:
Due to the internal fuel capacity
of some injection pumps, engine shutdown will not
occur until that fuel is used up.
Note:
If engine continues to run after the valve
closes, install a check valve such as CKV2336 in
return line.
Auxiliary Fuel Valves
Fuel Return Line Check Valve
The CKV series is an in-line, one-way valve for the
prevention of fuel siphoning from the diesel return
line by an injection pump. In engine shutdown sys-
tems using a Murphy SV valve, the CKV is necessary
to ensure a rapid shut down of the engine by fuel star-
vation of the injection system. For details see bulletin
CKV-7867B.
Fuel Line Pressure Relief Valve
The PRV50 is an in-line, one-way valve for the pre-
vention of overpressure damage to fuel filters and
their housings. This pressure relief valve operates in
conjunction with a Murphy SV series shutdown
valve; after the SV closes, a rapid high pressure
build-up caused by the fuel pump can occur. The
PRV, mounted in a fuel return line after the filter,
will open to relieve pressure buildup.
CKV2336
1/4 NPT
MURPHY
MURPHY
CKV0125
Fuel Tank
Battery
Fuel
Pump
Fuel-In
Fuel Return Line
CKV2336 or
CKV0125
Injector
Injection
Pump
SV
valve
*
PRV50
or PRV70
Filter
DIESEL ENGINE
G NC SW
1
SW
2
B
518PH
SWICHGAGE
®
Instruments
*
NOTE:
Mount the SV valve as close as possible
to the injection pump. If using the SV valve with
electronic devices, we recommend installing a
suppression diode across the SV valve coil.
Typical SV Valve Installation
Service Parts Callouts
1/4 NPT
1/4 in. (6 mm) Poly Tube, Flareless Connection
PRV50 and PRV70
A
(80-04-1412)
B
D
(3/16 Orif. 55-05-0194)
(1/4 Orifice 55-05-0193)
12 volt kit (55-01-0141)
24 volt kit (55-01-0145)
INDUSTRIAL PANEL DIVISION
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax
+1 918 317 4266
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
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.
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax
+1 918 317 4266
www.
fwmurphy
.com
Printed in U.S.A.
C
55-01-0155
(Std Valve)
C
55-01-0156
(HP Models)
