Hydraulic unloader

Details Hydraulic unloader Hydraulic unloader

1981-05-12

1983-05-31

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

239127, 417299, G05D 701

Patent

active

043856403

ABSTRACT:
An unloader for a high pressure hydraulic system, as a high pressure spraying system, has a pressure inlet for connection with a pump, a pressure outlet for connection with a load and a bypass outlet with a bypass valve. A piston moves the bypass valve between open and closed positions. The flow of liquid through the unloader from the inlet to the pressure outlet and to the hydraulic load establishes a pressure differential across the piston to close the bypass valve. When no flow to the load occurs, there is no differential pressure across the piston and the bypass valve is opened.

REFERENCES:
patent: 1934758 (1933-11-01), Temple
patent: 2022481 (1935-11-01), Schellenger
patent: 2692798 (1954-10-01), Hicks
patent: 3147922 (1964-09-01), Warner
patent: 3976090 (1976-08-01), Johnson
patent: 4182354 (1980-01-01), Bergstedt
patent: 4243064 (1981-01-01), Nolte

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