F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
137/94
F15B 13/02 (2006.01) F15B 11/16 (2006.01) F15B 13/04 (2006.01) F15B 13/08 (2006.01)
Patent
CA 1175730
ABSTRACT A hydraulic valve is provided which may include compensated, cascade or check functions made up of a valve body having a fluid inlet chamber, a work chamber arranged to deliver fluid to a consumer of hydraulic fluid, an exhaust chamber receiving fluid from the consumer of hydraulic fluid, a longitudinal bore intersecting said chambers, a spool in said bore arranged so that in one position the work chamber is in communication with the inlet chamber and sealed from the exhaust chamber and in a second position the work chamber is in communication with the exhaust chamber and sealed from the inlet chamber, a transverse bore in the valve housing communicating with said inlet chamber spaced from the longitudinal bore, a hollow valve spool movable in said transverse bore, a resilient biasing means urging said hollow spool to a position closing said inlet chamber from said transverse bore, an annular external radial pressure area intermediate the ends of said hollow spool, first signal passage means communicating between said work chamber and exhaust chamber in said second position and one side of said radial pressure area whereby to supplement the pressure of said resilient biasing means, a second signal passage means communicating between the transverse bore and the opposite side of said radial pressure area acting to oppose said resilient biasing means and supplemental pressure and outlet sleeve means in the end of the transverse bore opposite the resilient biasing means.
414739
Commercial Shearing Inc.
Smart & Biggar
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