Electronic slide valve block

Details Electronic slide valve block Electronic slide valve block

1993-04-06

1994-03-22

Tanner, Harry B.

Refrigeration

Automatic control

Refrigeration producer

62209, 62201, 622285, 62226, F25B 4302

Patent

active

052953629

ABSTRACT:
Loss of oil due to oil feedback is prevented in a screw compressor in a refrigeration application due to low capacity operation. The apparent suction temperature is compared to the temperature of the water exiting the evaporator to determine the apparent superheat and the loading is increased upon the apparent superheat reaching a predetermined level. Upon sensing a predetermined difference, an electronic slide valve block is initiated to prevent further unloading and loading may be initiated in a fixed amount, incrementally or on a pulsed basis.

REFERENCES:
patent: 4180986 (1980-01-01), Shaw
patent: 4257795 (1981-03-01), Shaw
patent: 4538421 (1985-09-01), Kawamoto
patent: 5086621 (1992-02-01), Starner et al.

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