M2582, M5081, and M5180 Series
Electromechanical and Pneumatic, Fuel Gas Shut
off Valves Installation and Operation Instructions
M-7980N
Revised 2015-01-06
Section
55
00-02-0206
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.
GENERAL INFORMATION
M2582 and M5081 Series
Tripping Power From Engine Ignition System or Battery
(Models available for magneto, CD ignition or 12/24 V battery)
These fuel hut-off valves are semi-automatic device 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 SWTCHGAGE' contact closes, a circuit is completed from power
through the nap-switch and coil. Now energized, the electromagnet
trips the latch, (latch can be tripped manually), the valve clo es, 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 MS0 models, the open/close indicator (green
button) retracts to indicate that the valve is closed.
Valve body is sandcast aluminum. Optional cast steel for MS08 I models.
M2582-P and M5180-P
MURPHY-NUMATIC'" Pneumatic Version for Pressure
The M2582-P and MS 180 pneumatically controlled valve can operate
from pres ure, and are designed to open and close automatically or semi
automatically (the supply can be air, oil or gas).
NOTE:
If using oil as a pressure source, use a lightweight oil.
The e valve will open on ri ing control pres ure and close on
decreasing control pressure. M2582-P and MS 180-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 MS 180-P valve can be opened against inlet
pres ure of I 00 p i (689 kPa) [6.89 bar].
Standard models include an escape vent for gas trapped forward in the
line after shut-off.
Model M5081
Approved•
M5081FS
Normally Energized Circuit
The M508 IFS i manually opened, electrically latched open and tripped
by interrupting the coil power circuit.
Magnetic Switch Adapter
As ignition ystem wear from u age, their power output becomes less
and le . lgn it ion 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
to450 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 shut
off valve to be used with dual Magneto Ignition systems.
NOTE:
All aluminum versions of the M508J Series Fuel Valve carry
Canadian Registration Number OC/476.2.
*
M5081 model is CSA approved for Class
I,
Division
I,
Groups
C
and D.
See
S
p
ecificati,.ms
on page 12.
Installation M-7980N page 1 of 12
