Murphy M25, M50 specifications Description, Specifications, Options and Accessories

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Electromechanical Fuel Shutoff Valves

MV-94134B

Revised 07-99

Catalog Section 55

(00-02-0124)

M25 and M50 Series

 

Instant Response to Shut Off Signal

 

Positive Valve Closure

 

Vents Gases Trapped After Shutdown

 

Explosion-proof Models Available

 

Models Available for Magneto,

 

CD Ignition or 12/24 VDC

Model M5081

Normally Energized Model Available

Description

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 valve’s disconnect knob. A normally energized model is available that holds the valve open elec- trically 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 avail- able for magneto, CD ignition or 12/24 V battery.

The M2582 is a 1 inch (25 mm) valve with 1 NPT connections. It has one SPDT snap-switch. The valve body is made of sandcast aluminum. It does not include the open/close indicator button.

M5081 is a 2 inch (51 mm) valve with 2 NPT connections. It has two SPDT snap-switches. The valve body is available in sandcast alu- minum or cast steel (optional).

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 in. (51 mm) steel flange pipe con- nection is available for M5081 and M5081FS steel body models (see Dimensions page 3).

Specifications

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 Ω

CD primary voltage: 1.38 to 3.8 A

M5081FS model: Energized to run (continuous-duty coil) coil resistance:

12 Volt model: 33 Ω (0.36 A)

24 Volt model: 136 Ω (0.17 A)

Magneto ignition coil resistance: 0.5 Ω

Magneto primary voltage: 1 to 5 A

Battery coil resistance : 7 Ω

12 or 24 VDC: 1.2 to 2.4 A

Wiring (See Internal Wiring page 2):

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 con- tacts rated 5 A @ 480 VAC maximum.

Options and Accessories

Diode Package (65010065)

The 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. Three models are available: 65020126: For Negative Ground CD Ignitions

up to 240 VDC

65020127: For Positive Ground CD Ignitions up to 450 VDC

65020155: For Negative Ground CD Ignitions 240 VDC to 450 VDC

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

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Contents Options and Accessories SpecificationsDescription M2582 Flow Rates Internal WiringM5081 and M5081FS BracketsSteel Flanged Option DimensionsAccessories How to OrderService Parts Shipping Information

M50, M25 specifications

The Murphy M25 and M50 are sophisticated electronic control modules designed for engine management and monitoring applications in various machinery and equipment. These modules are part of Murphy's tradition of delivering durable, high-performance instrumentation to meet the demanding needs of industries such as construction, agriculture, and energy production.

The Murphy M25 is notable for its compact design, making it suitable for tight installation spaces without compromising functionality. It features a user-friendly interface with a bright LED display that allows operators to easily monitor engine performance and diagnostics. The M25 can monitor key parameters such as oil pressure, coolant temperature, and battery voltage, providing real-time feedback that helps prevent engine damage and optimize performance. The integrated alarms alert users to critical issues, enabling swift response to potential problems.

In contrast, the Murphy M50 takes engine management to the next level with advanced data logging capabilities. This model is designed for applications requiring more complex monitoring and control. Along with the standard features found in the M25, the M50 supports extensive communication options, including CAN bus, allowing it to interface seamlessly with other electronic control systems. This feature is particularly beneficial in larger machinery where integrated systems are essential for smooth operations.

Both modules utilize cutting-edge technology, including robust microprocessor control and high-precision sensors. This ensures accurate measurements and reliable performance under various operating conditions. The M25 and M50 are engineered to withstand harsh environments, featuring rugged housings and protection against moisture and dust. Furthermore, they are designed for easy installation and maintenance, with straightforward wiring and programming.

The Murphy M25 and M50 are versatile solutions for a wide range of engine applications. Their adaptability makes them suitable for not only diesel engines but also for natural gas engines. Moreover, the scalability of these modules means they can be used in various setups, from small generator sets to large industrial engines.

In summary, the Murphy M25 and M50 modules are exemplary products in engine management technology. Their combination of user-friendly interfaces, advanced monitoring capabilities, and rugged construction ensures that they can meet the demands of modern equipment while providing invaluable insights into engine performance for operators. These modules continue to set the standard in reliability and performance, making them a preferred choice in the field.