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M25 & M50 Series
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Catalog excerpts

M25 & M50 Series - 1

FW MURPHY" PRODUCTION CONTROLS M25 & M50 Series These fuel shutoff valves are semi-automatic devices for shutdown of natural gas-fueled engines. The valve is opened manually and closes when the electromagnet is energized and trips the latch. The valve can be closed manually by turning the disconnect knob. A normally energized model is available that holds the valve open electrically and closes when the coil is de-energized. A vent in the valve body relieves trapped gas when the valve closes. A pop-out indicator button informs you when the valve is open or closed. The valve’s tripping power is provided by an engine ignition system or battery. Models are available for magneto, CD ignition or 12-/24-V battery. The M2582 is a 1-inch (25 mm) valve with one NPT connection. It has one SPDT snap-switch. The valve body is made of sandcast aluminum. It does not include the open/close indicator button. The M5081 is a 2-inch (51 mm) valve with two NPT connections. It has two SPDT snap-switches. The valve body is available in sandcast aluminum or cast steel (optional). The M5081FS is the same as the M5081 but has a normally energized circuit. This circuit allows the valve to be held open electrically and close by interruption of the coil’s power circuit. A manual trip knob is not available on this model. An optional 2-inch (51 mm) steel flange pipe connection is available for M5081 and M5081FS steel body models (see Dimensions). Options & Accessories Diode Package (65010065) The FW Murphy 202 V diode package is designed to allow the fuel shutoff valve to be used with dual Magneto Ignition systems. Sold separately (see How to Order). 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 adapter stores energy from the CD ignition to trip the fuel valve. Two models are available: 65700053 (65020126): For Negative Ground CD Ignitions up to 240 VDC 65700055 (65020155): For Negative Ground CD Ignitions 240 VDC to 450 VDC Valve Body: Sandcast aluminum, painted red (corrosion resistance). Optional cast steel available for M5081 and M5081FS models only. Valve Seat: Buna-N Maximum Pressure Rating: • M2582: 80 psig (552 kPa) [5,52 bar] • M5081: 100 psig (689 kPa) [6,89 bar] • M5081FS: 100 psig (689 kPa) [6,89 bar] Coil Rating: Intermittent duty; coil type must match power source; • CD ignition coil resistance: 72 Q • CD primary voltage current: 1,38 to 3,8 A • M5081FS model: Energized to run (continuous-duty coil) coil resistance: 12 Volt model: 33 Q (0,36 A) 24 Volt model: 136 Q (0,17 A) • Magneto ignition coil resistance: 0,5 Q • Magneto primary voltage current: 1 to 5 A • Battery coil resistance: 7 Q 12 or 24 VDC: 1,2 to 2,4 A Wiring (See Internal Wiring): • M2582: Wire leads • M5081 and M5081FS: Terminal blocks Snap-switch Rating: 5 A @ 480 VAC Laboratory Approval: CSA listed for Class I, Groups C and D Hazardous Locations, 5 amps maximum; intermittent duty; models M5081 and M5081-CD engine ignition powered and model M5081-B, 12 or 24 VAC or VDC; switch contacts rated 5 A @ 480 VAC maximum 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 product names and the FW MURPHY logo are proprietary trademarks. This document, including textual matter and illustrations, is copyright protected with all rights reserved. (c) 2017 FW MURPHY. A copy of our typical warranty may be viewed or printed by going to www.fwmurphy.com/warranty.

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M25 & M50 Series - 2

Steel Flanged Option 3 (available on M5081FS and M5081FS steel body configurations only)

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M25 & M50 Series - 3

»» NOTE: For grounding the ignition (CD models only) through the fuel valve’s internal snap-switch, a FW Murphy Magnetic Switch adapter (see How To Order) must be used in addition to a 100 ohm, 2 watt resistor

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M25 & M50 Series - 4

Options listed below. All configurations may not be available. Call your sales representative or FW Murphy for more information. Part Number

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