Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1994-11-23
1996-01-23
Hepperle, Stephen M.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
137116, F15B 1105, F15B 1116
Patent
active
054858640
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pressure compensation valve to be employed in a hydraulic circuit and so forth for distributing pressurized working fluid supplied from a signal pressurized fluid source to a plurality of hydraulic loads at respectively predetermined flow rates. More specifically, the invention relates to a pressure compensation valve which can distribute the pressurized working fluid of the common pressurized fluid source to a plurality of hydraulic loads, such as hydraulic actuators, without employing a shuttle valve.
2. Description of the Related Art
When a pressurized fluid discharged from a single hydraulic pump is distributed to a plurality of actuators, pressurized fluid tends to be supplied only to the actuator having the lowest load pressure. For avoiding this, hydraulic circuits, such as that shown in Japanese Unexamined Patent Publication (Kokai) No. Showa 60-11706, for example, have been known. Namely, the hydraulic circuit is constructed such that pressure compensation valves are provided at the inlet sides of direction control valves connected to respective actuators, which pressure compensation valves are set at the highest load pressure among load pressures of respective actuators for distributing flow rates of pressurized fluid discharged from a hydraulic pump to a plurality of actuators having respectively different load pressures.
The pressure compensation valve to be employed in such a hydraulic circuit has a construction for determining an output pressure on the basis of a pressure difference between a higher pressure side pressure chamber and a lower pressure side pressure chamber or a pressure difference between an inlet pressure and an outlet pressure. Therefore, highest load pressure must be introduced to the low pressure side pressure chamber and thus requires a shuttle valve which compares load pressures of respective actuators.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a pressure compensation valve which can simplify the conventional construction and enables distribution of hydraulic output pressure of a single hydraulic pressure supply source to a plurality of hydraulic loads without employing the shuttle valve.
In order to accomplish the above-mentioned objects, according to the first aspect of the invention, a pressure compensation valve comprises: establishing and blocking communication between an inlet port and an outlet port, and a pressure reduction valve formed by providing, in the valve body, a spool establishing communication between a second port and a third port by a pressure in a first pressure chamber communicating with the first port and blocking communication between the second port and the third port by a pressure in a second pressure chamber communicating with the third port, the second port and the third port by a spring and while contacting the valve.
According to the second aspect of the invention, a pressure compensation valve comprises: establishing and blocking communication between an inlet port and an outlet port, and a pressure reduction valve formed by providing, in the valve body, a spool establishing communication between a second port and a third port via a radially extending conduit and a blind hole by a pressure in a first pressure chamber communicating with a first port and blocking communication between the second port and the third port by a pressure in a second pressure chamber communicating with the third port, the second port and the third port by a spring while contacting the valve. supply system connecting a plurality of pressure compensation valves to a pump discharge passage of a hydraulic pump, providing direction control valves at the outlet sides of respective pressure compensation valves, and supplying discharged pressurized fluid of the hydraulic pump to a plurality of actuators, the pressure compensation valves each comprise: the pump discharge passage and an inlet port of a direction control valve, and a pressure reducin
REFERENCES:
patent: 3246845 (1966-04-01), Techler
patent: 3834162 (1974-09-01), Keady
patent: 4173866 (1979-11-01), Farr
patent: 4378816 (1983-04-01), Peiffer
Ikei Kazunori
Ishihama Kazuyoshi
Takeuchi Masamitsu
Hepperle Stephen M.
Kabushiki Kaisha Komatsu Siesakusho
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