Bi-directional flow control system
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United States of America Patent
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Dec 21, 1982
Grant Date -
N/A
app pub date -
Aug 21, 1980
filing date -
Aug 21, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For use in a fluid system, which includes a control valve or the like having one port to which the higher of two pressures is delivered and another port from which fluid flows to the lower of two pressures, a four-way shuttle valve with high and low pressure ducts. Pressure level passages connected from the two pressure zones, are each connected by lateral transfer passages to both the high and low pressure ducts. One-way check valves in each of the four lateral passages enables flow only to the high pressure port and from the low pressure port. In the event of pressure reversal, the check valves will shift so that flow is always from the high pressure line to the high pressure duct of the shuttle valve.
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