LGM 20 - Mark II

The LGM 20 - Mark II is a self-contained unloading valve which can be used wherever a continuous run compressor is required. The compressor may need to run continuously because the air demanded is close to the maximum output of the compressor, or because the compressor is driven by a gasoline or diesel engine.

Since the Mark II is a "vent" unloader, no built-in head unloaders are required on the compressor. The Mark II contains all components required: the pilot valve, the vent valve, and a check valve. Simply install the Mark II in the discharge line between the compressor and receiver.

Valve cut-in and cut-out pressures are factory set per customer specifications. Minimum cut-out pressure is 60 PSI and maximum cut-out pressure is 250 PSI. If no settings are specified, the valve is set at our standard setting of 115 PSI cut-out and 95 PSI cut-in. The valve is also field adjustable.

Details of construction include a forged brass body, brass and zinc-plated steel internal components, stainless steel springs, and glass filled fluropolymer poppets.

Options include a 1/8" NPT tapped port for throttle control of a gas engine, a lockout clip for "dual control" applications, a special 1/8" NPT tapped port for pressure switch unloader valve, a vent port muffler, and a toggle unloading lever for one-hand warm up control.

LGM 30 - Mark III

The LGM 30 - Mark III continues the tradition of the original Mark II. 25 years of experience were incorporated into the design and development of this continuous run control.

The Mark III combines all components required for a continuous run compressor application: the pilot valve, the vent valve, and the check valve. Since the Mark III is a "vent" unloader, built-in compressor head unloaders are not required.

The compact size and straight-through flow design of the Mark III make installation easy. Simply install the Mark III into the air receiver, and attach the compressor discharge line to the valve inlet. The Mark III is suitable for compressors of up to 30 SCFM delivery.

Cut-in and cut-out pressure settings are factory set to customer specifications. Minimum cut-out pressure is 250 PSI. If no setting is specified, the valve is set at our standard setting of 115 PSI cut-out and 95 PSI cut-in. The valve is also field adjustable.

Details of construction include a forged brass body, zinc-plated steel internal components, fluorocarbon piston ring, stainless steel springs, and a glass-filled fluropolymer check valve poppet.

Options include a 1/8" NPT tapped port for throttle control of a gas engine, a lockout clip for "dual control" applications, a special 1/8" NPT tapped port for pressure switch unloader valve, a vent port muffler, and a toggle unloading lever for one-hand warm up control. Vibra-Seal® pre-applied thread sealant is also available on external inlet pipe threads.

LGM 40 - Mark IV

The LGM 40 - Mark IV continues in the traditions of the original Mark II and the Mark III. The Mark IV combines all components required for a continuous run compressor application: the pilot valve, the vent valve, and the check valve. Since the Mark IV is a "vent" unloader, built-in compressor head unloaders are not required.

The compact size and the combination of straight-through or 90° flow design of the Mark IV make installation easy. Simply install the Mark IV into the air receiver, and attach the compressor discharge line to the valve inlet. The Mark IV is suitable for compressors of up to 30 SCFM delivery.

Cut-in and cut-out pressure settings are factory set to customer specifications. Minimum cut-out pressure is 60 PSI and maximum cut-out pressure is 250 PSI. If no settings are specified, the valve is set at our standard setting of 115 PSI cut-out and 95 PSI cut-in. The valve is also field adjustable.

Details of construction include a forged brass body, zinc plated steel internal components, fluorocarbon piston ring, stainless steel springs, and a glass filled fluropolymer check valve poppet.

Options include a 1/8" NPT tapped port for throttle control of gas engine, a lockout clip for "dual control" applications, a special 1/8" NPT tapped port for a pressure switch unloader valve, a vent port muffler, and a toggle unloading lever for one-hand warm up control. Vibra-Seal® pre-applied thread sealant is also available on external inlet and outlet pipe threads.