Warm-up circuit for hydraulic pilot control system

Details Warm-up circuit for hydraulic pilot control system Warm-up circuit for hydraulic pilot control system

1989-03-06

1990-11-27

Look, Edward K.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

13762563, F15B 13042, F15B 13043

Patent

active

049727621

ABSTRACT:
A pilot control circuit including a pilot pressure pump and a float center connected directional control pilot valve is provided with a warm up circuit for warming up the hydraulic fluid in the pilot circuit. The warm up circuit includes a pair of branch conduits commonly connected to the high pressure side of the pilot pressure pump and respectively connected via flow restriction to the pilots of a primary directional control valve. Fluid can flow from the branch conduits through the pilots and then through the centered pilot valve to the low pressure side of the pilot pump, allowing a warm up circulation of fluid through the entire pilot circuit while its control valve remains centered.

REFERENCES:
patent: 3748967 (1973-07-01), Richter et al.
patent: 3799202 (1974-03-01), McAvoy
patent: 3897717 (1975-08-01), Kellner
patent: 3921503 (1975-11-01), Kubik
patent: 4428400 (1984-01-01), Tantardini
patent: 4677899 (1987-07-01), Schulte et al.
patent: 4811650 (1989-03-01), Lonnemo
patent: 4858649 (1989-08-01), Satoh et al.

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