Murphy Diesel-Fuel Shutoff Valve SV User Manual

SV-99026B page 1 of 2

SV-Series

■

Solenoid Operated Fuel Shutoff Valve

■

Diesel Engines

■

Diesel Driven Pumps and
Compressors

■

High Pressure Models

■

Select from 12 or 24 VDC Models

Description

The SV-series valve is a normally closed valve that
opens when current is supplied from the battery
through a magnetic switch. Temperature, level, or
pressure SWICHGAGE®instruments installed on
the engine and pump or compressor, trip the mag­netic switch, breaking the circuit from the battery
which closes the valve and stops the engine.

The SV-12 valve operates on 12VDC, has a 1/4 NPT
inlet and outlet, and a full 3/16 in. (5 mm) orifice.
24 VDC (SV-24) is optional The SV valves open
against 30 psi. (207 kPa) [2.07 bar] inlet pressure.

Greater Flow Rate Valve

Special series SV valve is available with a 1/4 in.
(6 mm) orifice which opens against maximum
pressure of 15 psi (103 kPa) [1.03 bar]. This
valve is recommended where greater flow is
required, and only static head or low transfer
pump pressures are encountered.

High Pressure Valves

SV-HP series valves open against diesel fuel
transfer pump pressure up to 60 psi (414 kPa)
[4.14 bar]. Models are available for 12 or 24 volt
DC systems. The orifice is 1/4 in. (6 mm), using
the same inlet/outlet and options as standard SV.

Specifications

Electrical Rating: 12 VDC, 10 watts
Orifice: 3/16 in. (5 mm) diameter (optional 1/4 in.

[6 mm] diameter). See chart above, right.

Body Connections: 1/4 NPT inlet/outlet
Maximum Opening Pressure:

3/16 in. (5 mm) orifice: 30 psi (207 kPa) [2.07 bar]

1/4 in. (6 mm) orifice: 15 psi (103 kPa) [1.03 bar]

SV-HP (High Pressure model)

Orifice: 1/4 in. (6 mm) diameter. See chart below.
Maximum Opening Pressure:

60 psi (414 kPa) [4.14 bar].

Dimensions

Shipping Weight: 1 lb. 6 oz. (0.68 kg)
Shipping Dimension: 3 x 2-3/4 Sx 2-3/4 in.

(76 x 70 x 70 mm)

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

How to Order

See the diagram below, example: SV–12 – HP
CAUTION: Do NOT use the SV valves with distribu-

tor type injection pumps. For use with DIESEL ONLY.

Coil Voltage

12 =

12 VDC

24 =

24 VDC

HP =

High Pressure

Orifice

Blank (non-“HP” models) =

3/16 in. (5mm) dia.

Blank (“HP” models) =

1/4 in. (6 mm) dia.

4 =

1/4 in. (6 mm) dia. (non-“HP” models only)

SV– __ – __ – __

A Screw 80-04-1412
B Coil Replacement Kit

12 volt kit 55-01-0141
24 volt kit 55-01-0145

C Core Repair Kit (Std mdls)55-01-0155

C Core Repair Kit (HP mdls) 55-01-0156

D Valve Body: 3/16 Orifice

1/4 NPT x 1/4 NPT(std.) 55-05-0194

D Valve Body: 1/4 Orifice

1/4 NPT x 1/4 NPT 55-05-0193

PPaarrtt DDeessccrriippttiioonn

PPaarrtt NNuummbbeerr

SV Repair Parts

Callouts diagram shown on page 2

CCaalllloouutt

SV-99026B

Revised 6-05

Catalog Section 55

(00-02-0375)

Diesel-Fuel Shutoff Valves

Differential

Pressure

Gallons per

Minute

Liters per

Minute

2-11/16 in.

(68 mm)

3/16 Orifice 1/4 Orifice

1 2 5 10 20 30 1 2 5 10 15

.48 .68 1.1 1.5 2.2 2.6 .72 1.05 1.65 2.35 2.70

2.01 2.85 4.62 6.3 9.24 10.92 3.02 4.416.93 9.87 11.34

2-5/32 in.

(55 mm)

BATTERY GROUND

2-3/16 in.

(56 mm)

FLOW

2-1/8 in.
(54 mm)

11/16 in.
(17 mm)

3/8 in.

(9 mm)

3/4 in.

(19 mm)

Brass Body

10-24 NC-2B

2 Mounting Holes

3/8 in.

(9 mm)

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 normal­ly 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 pre­vent 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 elec­trical 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 sys­tems using a Murphy SV valve, the CKV is necessary
to ensure a rapid shut down of the engine by fuel star­vation 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 pre­vention 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

CKV0125

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
[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

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

www.fwmurphy.com

Printed in U.S.A.

C 55-01-0155
(Std Valve)

C 55-01-0156
(HP Models)

MURPHY

MURPHY

DIESEL ENGINE

SWICHGAGE

Instruments

®

518PH

PRV50
or PRV70

Filter

* 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.

SV

valve*

Injection

Fuel-In

Pump

Injector

CKV2336 or
CKV0125

Fuel Return Line

Fuel

Pump

GNCSW1SW2B

Battery

Fuel Tank