Brass Unloader Valve

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.