Pumps – Processes
Patent
1995-10-04
1997-12-09
Gluck, Richard E.
Pumps
Processes
417443, 417446, F04B 8100
Patent
active
056953259
ABSTRACT:
An unloader system is provided for a gas compressor including a cylinder, a piston reciprocably mounted in the cylinder, a crankshaft connected to the piston and suction and discharge valve assemblies, selectively communicating the cylinder with suction and discharge lines. The compressor crankshaft is driven by a prime mover. The unloader system includes an unloader valve assembly, which can comprise one of the suction or discharge valve assemblies, and an unloader actuation system including a controller and a stepper motor. The unloader valve assembly includes a valve seat with a plurality of seat passages arrayed in a seat passage circle. The unloader actuation system rotates an unloader valve assembly guard and valve members mounted thereon in increments corresponding to the radial spacing of the valve members and the seat passages, with each incremental rotation corresponding to a single crankshaft revolution. A method of unloading a compressor includes the steps of arranging a plurality of valve members and seat passages in circles in an unloader valve assembly and incrementally rotating the valve guard in synchronization with the compressor crankshaft.
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