Unidirectional filter for hydraulic systems

Details Unidirectional filter for hydraulic systems Unidirectional filter for hydraulic systems

1987-11-25

1989-05-30

Lacey, David L.

Wells

Processes

With indicating, testing, measuring or locating

166375, 210130, 210136, 210137, 210167, 210170, B01D 2710, B01D 3514, B01D 3502

Patent

active

048341770

ABSTRACT:
A hydraulic system has a filter that filters only when the fluid is flowing in one direction. The filter is located in a flow passage between a hydraulic fluid source and a valve in a well. The source supplies hydraulic fluid pressure in a forward direction to keep the valve open. A bypass passage allows hydraulic fluid to bypass the filter. A check valve located in the bypass passage prevents forward flowing fluid from flowing through the bypass passage. If hydraulic pressure is lost, hydraulic fluid will return through the bypass passage, rather than flowing through the filter, to allow the valve to quickly close.

REFERENCES:
patent: 2895613 (1959-07-01), Griffiths
patent: 3589517 (1968-12-01), Palmai
patent: 3814250 (1974-06-01), Mezger
patent: 3906994 (1975-09-01), Schon
patent: 3996137 (1976-12-01), Cooper
patent: 4051031 (1977-09-01), Suzuki
patent: 4246109 (1981-01-01), Manders
patent: 4279746 (1981-07-01), Leutz
patent: 4469594 (1984-09-01), Poetter
patent: 4519434 (1986-05-01), Prudhomme

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