초록 ▼

An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondar

An improvement to a priority valve which provides priority flow to a priority function, not only directly from a fluid power source, but also from an accumulator when the priority demand exceeds the output of the fluid power source. This priority flow valve also provides flow to one or more secondary functions when the priority flow requirements are satisfied or when the priority flow path is blocked.

대표청구항 ▼

An improved priority flow valve of the type used between a fluid power source and functions operated by the source, one of the functions being a priority function connected to the valve through a restriction and at least one other function being a secondary function connected to the valve; the valve

An improved priority flow valve of the type used between a fluid power source and functions operated by the source, one of the functions being a priority function connected to the valve through a restriction and at least one other function being a secondary function connected to the valve; the valve having a bore, an inlet chamber connected to the fluid power source, a priority outlet chamber connected to the priority function, a secondary outlet chamber connected to the secondary function; the bore passing through these inlet, priority outlet, and secondary outlet chambers; valve spool means, slidably positioned in the bore by a control servo with opposing chambers, for sensing pressures upstream and downstream from the restriction, a land near each end of the valve spool means, an annular groove located between the two lands and conditionally connecting the inlet chamber with the priority and secondary outlet chambers, and spring means for urging the valve spool means in one direction; wherein the improvement comprises: an accumulator chamber adjacent to the bore in the priority flow valve; an accumulator connected to the fluid power source and to the accumulator chamber; an additional land on the valve spool means; an accumulator annular groove on the valve spool means, formed by the additional land, conditionally connecting the priority outlet chamber with the accumulator chamber when the valve spool means is in an extreme priority demand position.