Murphy M5081FS, M2582-P, M5180-P Installation And Operation Instructions Manual

M2582, M5081, and M5180 Series
Electromechanical and Pneumatic, Fuel Gas Shut­off Valves Installation and Operation Instructions

M2582 and M5081Series

Tripping Power From Engine Ignition System or Battery
(Models available for magneto, CD ignition or 12/24 V battery)

These fuel shut-off valves are semi-automatic devices for shutdown of
natural gas fueled engines. The standard valve opens by manual
operation of the reset handle. A latch in the upper body of the valve will
set and hold the valve open. At this point no electric power is used.
The electromagnetic coil is de-energized, the snap-switch(es) is SET.

If a SWICHGAGE®contact closes, a circuit is completed from power
through the snap-switch and coil. Now energized, the electromagnet
trips the latch, (latch can be tripped manually), the valve closes, and the
snap-switch resets. Power switches from the coil circuit to your choice
of an open line, an electrical ground, or an alarm. After tripping, the
vent seal opens, and on the M50 models, the open/close indicator (green
button) retracts to indicate that the valve is closed.
Valve body is sandcast aluminum. Optional cast steel for M5081 models.

M2582-P and M5180-P

MURPHY-NUMATIC

™

Pneumatic Version for Pressure

The M2582-P and M5180 pneumatically controlled valves can operate
from pressure, and are designed to open and close automatically or semi­automatically (the supply can be air, oil or gas).

NOTE: If using oil as a pressure source, use a lightweight oil.

These valves will open on rising control pressure and close on
decreasing control pressure. M2582-P and M5180-P automatically open
at 2 psi (14 kPa) [0.14 bar] and fully open at 3 psi (21 kPa) [0.21 bar].

All models include a built-in lever to aid in opening the valve manually.
The M2582-P can be manually opened against inlet pressure of 80 psi
(552 kPa) [5.52 bar]. The M5180-P valve can be opened against inlet
pressure of 100 psi (689 kPa) [6.89 bar].

Standard models include an escape vent for gas trapped forward in the
line after shut-off.

M5081FS

Normally Energized Circuit

The M5081FS is manually opened, electrically latched open and tripped
by interrupting the coil power circuit.

Magnetic Switch Adapter

As ignition systems wear from usage, their power output becomes less
and less. Ignition may not have the capacity to reliably trip the Fuel
Valve. Therefore, the use of a Magnetic Switch Adapter for CD
ignition systems is recommended. The Magnetic Switch Adapter is a
device that stores energy from the CD ignition to trip the Fuel Valve.
Three models are available:

65700053 (was 65020126): For use with negative ground ignitions
up to 240 VDC.

65700054 (was 65020127): For use with positive ground ignitions
up to 450 VDC.

65700055 (was 65020155): For use with negative ground ignitions
up to 450 VDC.

100 ohm, 2 watt Resistor

For Capacitor Discharge Ignitions that are specified to be grounded when
the valve closes, and a Magnetic Switch Adapter is in use. The resistor
must be connected in the system to prevent damage to the snap-switches
in the fuel shut-off valve (see typical wiring diagrams).

Diode Package

The Murphy diode package (65010065) is designed to allow the fuel shut­off valve to be used with dual Magneto Ignition systems.

NOTE: All aluminum versions of the M5081 Series Fuel Valve carry
Canadian Registartion Number OC1476.2.

*

M5081 model is CSA approved for Class I, Division 1, Groups C and D.
See Specifications on page 12.

GENERAL INFORMATION

Please read the following instructions before installing. A visual inspection of this product for damage during shipping is
recommended before mounting. It is your responsibility to have a qualified person install the unit and make sure installation
conforms with NEC and local codes.

M-7980N

Revised 11-02

Section 55

(00-02-0206)

BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT

✔ Disconnect all electrical power to the machine.
✔ Make sure the machine cannot operate during installation.
✔ Follow all safety warnings of the machine manufacturer.
✔ Read and follow all installation instructions.

Model M5081

Approved

*

Installation M-7980N page 1 of 12

WARNING

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VALVE CUT-OUT

A.

Main Stem

B.

Pressure Disc/seal (in run/open)

C.

Pressure Disc/seal (in trip/closed)

D.

Vent Seal Gland

E.

Reset Knob (latches valve open)

F.

Manual Trip Knob (not available for M5081FS)

G.

Indicator Button (out with valve open)

H.

Pipe Plug

A

B

D

E

F

Understanding the Basic Operation

of the Fuel Shut-off Valve

The valve below is shown in the run (open) position.
Pressure is equalized, seat (B) is open, allowing
the fuel to flow. When valve is in the tripped position
(closed), seat closes (C).
The vent (D) opens to relieve trapped downstream fuel
to vent to a non-hazardous area.

C

NOTE:

If the vent-after-tripping feature is not used,
remove O-ring (D), to avoid condensation accumulation
that can hamper trip action.
Be sure to replace Pipe Plug (H) and to clean vent
periodically.

Vent to relieve trapped fuel
outside the hazardous area.

Terminal Block is
within this case.

G

Pipe Plug (remove to
install vent tube).

TYPICAL MODEL (M5081) SHOWN

H

FLOW CHARACTERISTICS

250

[7.08]

500

[14.16]

1000

[28.32]

1250

[35.40]

1500

[42.48]

1750

[4956]

2000

[56.64]

2250

[63.72]

2500

[70.80]

3000

[84.96]

2750

[77.88]

750

[21.24]

0

1.0

[25.4]

2.0

[50.8]

3.0

[76.2]

4.0

[101.6]

5.0

[127.0]

6.0

[152.4]

7.0

[177.8]

8.0

[203.2]

9.0

[228.6]

10.0

[254.0]

4 oz. (0.11 kg.)

10 oz. (0.28 kg.)

5 psig (34 kPa) [0.34 bar]

10 psig (69 kPa) [0.69 bar]

20 psig (138 kPa) [1.38 bar]

30 psig (207 kPa) [2.07 bar]

4 oz. (0.11 kg.)

10 oz. (0.28 kg.)

5 psig (34 kPa) [0.34 bar]

10 psig (69 kPa) [0.69 bar]

20 psig (138 kPa) [1.38 bar]

30 psig (207 kPa) [2.07 bar]

4 oz. (.11 kg.)

M2582 Series

M5081 and
M5180 Series

Inches water column (∆p) drop across valve.

Millimeters water column in brackets [ ].

Standard cubic feet per hour. Cubic meters per hour in brackets [ ].

Inches water column (∆p) drop across valve.

Millimeters water column in brackets [ ].

Standard cubic feet per hour. Cubic meters per hour in brackets [ ].

Installation M-7980N page 2 of 12

3.0

[76.2]

2.0

[50.8]

4 oz. (.11 kg.)

4 oz. (.11 kg.)

10 oz. (.28 kg.)

10 oz. (.28 kg.)

10 psig (69 kPa) [.69 bar]

1.0

[25.4]

500

0

[14.16]

1000

1500

[28.32]

[42.48]

2000

2500

[56.64]

[70.80]

10 psig (69 kPa) [.69 bar]

20 psig (138 kPa) [1.38 bar]

20 psig (138 kPa) [1.38 bar]

30 psig (207 kPa) [2.07 bar]

30 psig (207 kPa) [2.07 bar]

3000

3500

4000

[84.96]

[99.12]

[113.28]

4500

[127.44]

5000

[141.60]

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DIMENSIONS

M2582

M5180-P

Magnetic Switch Adapters

65700053

(was 65020126); 65700054 (was 65020127); 65700055 (was 65020155)

M2582-P

CAUTION: THE ARROW ON THE SIDE OF THE FUEL VALVE MUST POINT TO THE CORRECT DIRECTION OF THE

FLOW, FROM FUEL SOURCE TO THE ENGINE. APPLY PIPE DOPE ONL

Y TO FUEL PIPE, NOT TO THE FUEL VALVE.

Installation M-7980N page 3 of 12

Manual Trip

Knob

1/4 NPT
Vent and Plug

Reset Knob

3-3/32 in.
(79 mm)

5-1/2 in. (140 mm)

Latch Arm (see NOTE 2)

Breather Vent
(see NOTE 1)

2 NPT
(2 places)

Vent and Plug
1/2 NPT

1/2 NPT Conduit
Connection

1 NPT
(2 places)

7-5/16 in.
(186 mm)

9-3/8 in. (238 mm)

10-7/16 in. (265 mm)

1/4 in. (6 mm) tube connection; control
pressure 3 psi (21 kPa) [0.21 bar] minimum,

Latch Arm (see NOTE)

Breather/Vent

1/16 in. (2 mm)

1 NPT
(2 places)

1/4 NPT

Vent and

Plug

3-3/32 in.
(79 mm)

5-1/2 in. (140 mm)

NOTE: Thumb operated opening latch (2.5 psi [17 kPa]

[0.17 bar] required to release cocking latch)

1/4 in. (6 mm)
connection;
control pressure
3 psi (21 kPa)
[0.21 bar] minimum,
80 psi (552 kPa)
[5.52 bar] maximum
(see NOTE 1)

75 psi (517 kPa) [5.17 bar] maximum.

6-9/16 in.
(167 mm)

6-1/8 in.

(156 mm)

4-3/8 in.

(111 mm)

4-1/4 in.

(108 mm)

NOTE 1: Control pressure connection fitting and breather vent fitting can be swapped to convert to vacuum control.
NOTE 2: Thumb operated opening latch (2.5 psi [17 kPa] [0.17 bar] required to release cocking latch).

Panel Mount screws

10-24 N.C. x

5/16 in. (8 mm) long

2-5/16 in. (59 mm)

1-15/32 in.

(37 mm)

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3/8 in.
(10 mm)

31/32 in.
(25 mm)

15/32 in.
(12 mm)

Terminal screws

8-32 N.C. x

1/4 in. (6 mm) long

2-5/8 in. (67 mm)

GND ALT1 ALT2 SW

1-23/32 in.
(44 mm)

2-7/16 in.
(62 mm)

DIMENSIONS

continued

M5081 and M5081FS

M5081-3 Steel Flanged Option

CAUTION: THE ARROW ON THE SIDE OF THE FUEL VALVE MUST POINT TO THE CORRECT DIRECTION OF THE

FLOW, FROM FUEL SOURCE TO THE ENGINE. APPLY PIPE DOPE ONL

Y TO FUEL PIPE, NOT TO THE FUEL VALVE.

Installation M-7980N page 4 of 12

Manual Trip Knob

Inlet
Breather

Vent and Plug
1/2 NPT

(M5081 only)

9-3/8 in. (238 mm)

1/2 NPT Conduit

Reset Knob

Connection (2 plcs.)

10-5/16 in.
(262 mm)

Indicator

Button

2 NPT

(2 places)

3 in. (76 mm)

7-3/4 in. (197 mm)

1-3/8 in. (35 mm)

3-7/16 in.

(87 mm)

4-1/16 in.
(103 mm)

14-25/64 to 14-29/64 in.

(366/367 mm)

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3-5/8 in.
(92 mm) dia.

2 in. (51 mm) dia. 2 places

150# RF (raised face) pipe flange

45°

3/4 in. (19 mm) dia.
(4 places) each end
equally spaced on a
15/32 in. (121 mm) b.c.
(bolt circle)