Two-speed shift valve
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United States of America Patent
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-
Apr 1, 1986
Grant Date -
N/A
app pub date -
Mar 28, 1984
filing date -
Mar 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A two-speed, pilot-operated selector valve which directs hydraulic fluid to two motor elements with a common output shaft to obtain a high-torque, low-speed mode, or to one motor element, while recirculating the second element in a loop, to obtain a low-torque, high-speed mode. The spool has a built-in logic mechanism which, while shifting from one position to the other, prevents any momentary condition where a motor discharge port is blocked or a fluid path exists that bypasses both motor elements.
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