Pumps – Processes
Patent
1986-09-16
1987-11-03
Freeh, William L.
Pumps
Processes
417299, 417310, 418195, 418201, F04B 4902, F04B 4900, F04C 1816, F04C 1820
Patent
active
047040696
ABSTRACT:
A method is disclosed for operating a large motor-driven refrigeration gas compressor which has independently movable suction and discharge slide valves to prevent undesirable, possibly damaging hydraulic pressure build-up caused by sealing oil remaining in the gas compression chambers during compressor start-up. While the compressor is started and brought up to full speed, the suction slide valve is disposed in fully unloaded position to fully open the gas suction port and the discharge slide valve is disposed in position to fully open the gas discharge port to enable excess oil in the gas compression chambers to exit freely through the compressor gas discharge port before oil pressure build-up can occur. When the compressor is at full speed, the suction slide valve is positioned to maintain a desired gas suction pressure and the discharge slide valve is positioned to equalize gas pressure between the gas compression chambers and the compressor gas discharge port. On shut-down of the compressor both slide valves are returned to their start-up positions.
REFERENCES:
patent: 4583373 (1986-04-01), Shaw
patent: 4597726 (1986-07-01), Soderlund
patent: 4611976 (1986-09-01), Shibbye
Kocher Erich J.
Szymaszek Paul G.
Freeh William L.
Kirby Thomas F.
Nilles James E.
Vilter Manufacturing Corporation
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