Unidirectional filter for hydraulic systems
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United States of America Patent
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-
May 30, 1989
Grant Date -
N/A
app pub date -
Nov 25, 1987
filing date -
Nov 25, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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