Integral over-running load control valve on tractor remote valve section for agricultural loader boom circuit
OwnerVladimir M. Kowalykinventor
Life of this patent
Estimating the term…
Abstract
These and other features and objects are achieved by providing an over-running load control valve integral with the remote valve section of an agricultural tractor to allow it to efficiently work in a multipurpose agricultural environment. A counterbalance cartridge valve, with reverse flow check, is manifolded to an agricultural remote valve section.
Claims14
In an agricultural tractor having a source of pressurized hydraulic fluid, a manually activated control valve in fluid-flow communication with the source of pressurized hydraulic fluid, and a hydraulically controlled loader boom lift circuit, including at least one hydraulic cylinder with a raise port, a lower port, and a ram therebetween, said raise and lower ports in fluid-flow communication with the control valve, the improvement comprising:
- said control valve has at least one neutral position, one raise position causing pressurized fluid to flow to said raise port of said at least one hydraulic cylinder to extend said ram, and one lower position causing pressurized fluid to flow to said lower port of said at least one hydraulic cylinder to retract said ram;
- and
- a counterbalance relief valve with a relief pressure setting higher than the lift capacity of said at lest one hydraulic cylinder, said relief valve positioned between said control valve and said raise port when said control valve is in said neutral position, thereby providing a positive, zero leak, lock of said at least one hydraulic cylinder.
An agricultural tractor loader boom circuit comprising:
- a source of pressurized hydraulic fluid;
- a manually activated control valve in fluid-flow communication with the source of pressurized hydraulic fluid;
- a hydraulically controlled loader boom lift circuit, including at least one hydraulic cylinder with a raise port, a lower port, and a ram therebetween, said raise and lower ports in fluid-flow communication with the control valve;
- said control valve having at least one neutral position, one raise position causing pressurized fluid to flow to said raise port of said at least one hydraulic cylinder to extend said ram, and one lower position causing pressurized fluid to flow to said lower port of said at least one hydraulic cylinder to retract said ram;
- and
- a counterbalance relief valve with a relief pressure setting higher than the lift capacity of said at lest one hydraulic cylinder, said relief valve positioned between said control valve and said raise port when said control valve is in said neutral position, thereby providing a positive, zero leak, lock of said at least one hydraulic cylinder.
An agricultural tractor loader boom circuit comprising:
- a source of pressurized hydraulic fluid;
- a manually activated control valve in fluid-flow communication with the source of pressurized hydraulic fluid;
- a hydraulically controlled loader boom lift circuit, including at least two hydraulic cylinders each with a raise port, a lower port, and a ram therebetween, said raise and lower ports in fluid-flow communication with the control valve;
- said control valve having at least one neutral position, one raise position causing pressurized fluid to flow to said raise ports of said hydraulic cylinders to extend said rams, and one lower position causing pressurized fluid to flow to said lower ports of said one hydraulic cylinders to retract said rams;
- and
- a counterbalance relief valve with a relief pressure setting higher than the lift capacity of said hydraulic cylinders, said relief valve positioned between said control valve and said raise ports when said control valve is in said neutral position, thereby providing a positive, zero leak, lock of said hydraulic cylinders.
Dependencies are inferred from the claim text.