G - Physics
05
D
137/95
G05D 11/00 (2006.01) B62D 5/07 (2006.01) F15B 13/02 (2006.01) G05D 16/10 (2006.01)
Patent
CA 1237633
A PRIORITY VALVE Abstract of the Disclosure A priority valve is disclosed for controlling fluid flow between a power source and a secondary hydraulic function operated by the power source. The priority valve includes a housing having first and second bores formed therein. An inlet passage connects the power source to the first bore while an outlet passage connects the first bore to the hydraulic function. A priority function is also fluidly connected to the power source upstream of the priority valve. A valve spool is positioned in the first bore and is movable between the first and second ends of the first bore. The valve spool has an annular groove which is in constant communication with both the inlet passage and with the first end of the first bore. The valve spool is movable between a first position blocking fluid flow from the first passage to the outlet passage and a second position permitting fluid flow therebetween. A pin is movably positioned in the second bore and has an enlarged end which extends into the first bore. Springs are present for urging the valve spool toward the first position and the pin toward the spool valve. The priority valve further includes a load signal passage connecting the priority function to the second end of the first bore. When full fluid flow is demanded by the priority function, the pressure difference between the load signal passage and the inlet passage decreases causing the valve spool 38 to move toward its first position. When the priority valve demands less than full flow, the pressure difference between the load signal passage and the inlet passage increases and the spool valve is allowed to move toward its second position. Should a situation occur wherein the priority function demands pressure approaching a maximum pressure which can be delivered by the power source, the pressure within the load signal passage increases and this pressure causes the enlarged end of the pin to contact the valve spool and force it toward its second position thereby assuring fluid flow between the power source and the secondary functions.
481406
Borden Ladner Gervais Llp
Deere & Company
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