FW Murphy Valves

Murphy Check Valves and Pressure Relief Valves enhance the operation of diesel engine fuel shutdown valves by reducing the time required for complete engine shutdown after the solenoid valve closes. The SV-Series Diesel Fuel Shutoff Valves for 12 and 24 volt systems open against greater diesel fuel transfer pump pressure. The PD8100 Series Pulsation Dampners eliminate pointer flutter on pressure indicating Swichgage® devices which are subject to pulsating pressure from reciprocating pumps or compressors. They also allow a close setting of high and low contact points providing for more accurate pressure indication and control of equipment. Please contact RJ Mann & Associates, Inc. inside sales to see which models are currently available.

 

CKV Series: In-Line, One-Way Diesel Fuel Check Valves

murphy.CKVseriesThe CKV series check valves are in-line, one-way valves that prevent fuel from being siphoned back into an injector or injection pump which could delay a shutdown. Murphy check valves enhance at the operation of diesel engine shutdown valves by reducing the time required for complete engine shutdown after the solenoid valve closes. 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.

Check valves close off the fuel return line(s) to prevent fuel or air from re-entering the injection system through the bypass line(s). Models CKV2336 is an in-line valve. Model CKV1WPS has a 21/64 in. (8 mm) banjo fitting that attaches to the return line of the final injector. All check valves allow fuel to flow away from the injectors but close to prevent fuel from flowing in the reverse direction.

There are three types of check valves: CKV2336, CKV0125 and CKV1WPS. The CKV2336 has a 1/4 NPT threaded male connection on each end for connecting to fuel line fittings or hoses. The CKV0125 has 1/4" (6 mm) poly tube, flareless connections. The CKV1WPS check valve is typically mounted in the fuel bypass line of the last fuel injector. The CKV1WPS features a hollow bolt connection and a barbed, 1/8 NPT connection for flex hose or fitting.

Literature

• Sales Bulletin (pdf)

PRV Series: Diesel Fuel Pressure Relief Valves

murphy.PRVseriesThe PRV50 and PRV70 are in-line, one-way valves for the prevention of over-pressure damage to fuel filters and their housings. These pressure relief valves 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 build-up.

PRV series pressure relief valves relieve overpressure in a fuel system usually caused by closing of a solenoid fuel valve. Murphy pressure relief valves enhance at the operation of diesel engine shutdown valves by reducing the time required for complete engine shutdown after the solenoid valve closes. The PRV50 and PRV70 have a 1/4 NPT threaded connection on each end for connecting to fuel line fittings or hoses.

The PRV50 and PRV70 valves relieve pressure buildup in the fuel system that can cause fuel filter canisters to burst. When the solenoid valve closes to stop the engine, the fuel transfer pump will continue to produce pressure as the engine slows down to stop. This pressure buildup, if not relieved, can cause fuel filter canisters or gaskets to leak. PRV’s are installed in the bypass line from the fuel filter(s) to the fuel return line.

Literature

• Sales Bulletin (pdf)

SV Series: Solenoid Operated Diesel Fuel Shutoff Valves

murphy.SV12The 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 valves are 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.

Features

• Solenoid operated fuel shutoff valve
• For use on diesel engines
• For use on diesel driven pumps and compressors
• High pressure models available
• Select from 12 or 24 VDC models

Literature

• Sales Bulletin/Installation Instructions (pdf)

M25 and M50 Series: Electromechanical Fuel Shutoff Valves

murphy.M5081These 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 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.

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 aluminum 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 connection is available for M5081 and M5081FS steel body models.

Features

• 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
• Normally energized model available

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)
• M50 Topworks Kit Instructions (pdf)

Models M2582-P and M5180-P: Pneumatic Valves for Fuel Gas Shutoff

The M2582-P and M5180-P are pneumatically controlled fuel shut-off valves that open and close automatically or semi-automatically. The pneumatic control pressure can be air, oil or gas. A manual lever aids in opening the valve when control pressure is insufficient. A gas escape vent, when properly vented and maintained, releases trapped gas from the valve after shutoff.

Automatic:  As the control pressure/vacuum increases the valve will open. When the control pressure/vacuum decreases, the valve will close.

Semi-Automatic:  If the control pressure/vacuum is too low and the valve does not open automatically, it can be opened manually by lifting the built-in lever arm and setting the latch. The latch resets automatically when control pressure rises enough to release it.

M2582-P is for 1 in. (25 mm) gas lines. It automatically opens at 2 psi (14 kPa) [.14 bar] and fully opens the seat at 3 psi (21 kPa) [.21 bar]. The valve can be manually opened with the lever and latch against inlet pressure of 80 psi (552 kPa) [5.52 bar]. The latch will release after pilot pressure reaches 2.5 psi (17 kPa) [.17 bar].

The M5180-P is for 2 in. (52 mm) gas lines. It automatically opens at 2 psi (14 kPa) [.14 bar] and fully opens the seat at 3 psi (21 kPa) [.21 bar]. The valve can be manually opened with lever and latched against inlet pressure of 100 psi (689 kPa) [6.89 bar]. The latch will release after pilot pressure reaches 2.5 psi (17 kPa) [.17 bar].

Features

• Pneumatically open and shut off fuel gas automatically or semi-automatically
• Pneumatic control pressure can be air, gas or oil
• Models for 2 in. or 1 in. (51 mm or 25 mm) fuel gas lines

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)

PD8100 Series: Pressure Pulsation Dampeners

murphy.PD8100The PD8100 Series eliminates pointer flutter on pressure indicating Swichgage® devices which are subject to pulsating pressure from reciprocating pumps or compressors. It also allows a close setting of high and low contact points providing for more accurate pressure indication and control of equipment.

The PD8100 Series decreases wear on geared movements and increases the life of pressure indicating instruments by eliminating excessive gage strain and unnecessary movement. A necessity which quickly pays for itself by protecting any pressure indicating and control instrument which is subject to pulsation.

PD8100 Series are not for use on oxygen or liquid oxygen applications.

Quality built with a large diameter valve stem wheel for ease of adjustment with clearly printed operating instructions. Machined from 1-3/8 in. (35 mm) hex bar stock. A two degree taper on valve and stem assure positive dampening.

Available in brass, carbon steel, 303 stainless steel or 316 stainless steel to meet pressure and environmental requirements with either 1/2 NPT or 1/4 NPT inlet connections:

PD8183:  All wetted parts are brass. Rated to 3,000 psi (20.68 MPa) [206.80 bar].

PD8184:  All wetted parts are carbon steel. Rated to 5,000 psi (34.47 MPa) [344.70 bar].

PD8185:  All wetted parts are 303 stainless steel. Rated to 10,000 psi (68.95 MPa) [689.50 bar].

PD8190:  All wetted parts are 316 stainless steel. Rated to 10,000 psi (68.95 MPa) [689.50 bar]. Meets NACE standard MR-01-75 for direct exposure to H2S.

Features

• Used on controllers, instruments and recorders to dampen pressure pulsation
• Eliminate gage pointer flutter
• Aids in providing more accurate pressure indication
• Decreases wear on a gage’s geared movement

Literature

• Sales Bulletin/Installation Instructions (pdf)

DVU Series Dump Valves

murphy.DVUseriesThe DVU Series are pneumatically controlled dump valves. The valves open and close automatically by pneumatic control from a Murphy L1200NDVOR or similar level controller and dump valve operator. Diaphragm actuated, the DVU Series dump valves operate at 30-70 psi (207-483 kPa) [2.07-4.83 bar] and up to 2000 psi (13.8 MPa)[138 bar] vessel pressure (depending on the model). A key benefit of this design is a hex union that provides the ability to replace the seat without removing the valve from piping.

Features

• For separators/scrubbers to 2000 psi (13.8 MPa)[138 bar] working pressure
• Hex union allows plug and seat replacement without piping removal
• Operates on 30-70 psi (207-483 kPa) [2.07-4.83 bar] control pressure
• Compatible with Murphy Level Controls
• Soft seat valve
• Manual valve operator

Applications

Designed for gas compressor scrubbers, the DVU Series can be used to dump any liquids compatible with its materials of construction.

Literature

• Sales Bulletin (pdf)
• Installation Instructions (pdf)



 
© 2016  RJ Mann & Associates Inc.