Title:
ELECTROHYDRAULIC PROPORTIONAL CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/1990/007669
Kind Code:
A1
Abstract:
This invention relates to an electrohydraulic proportional control valve which fills always pressure oil into an oil path on the output side to prevent the existence of air therein, can move a spool without any time delay when a solenoid is energized and thus improves response. The hydraulic proportional control valve includes a spool (7) which establishes cuts off communication between an inlet port (4) communicating with a hydraulic pump (P) and an outlet port (6) on the output side, a spring disposed in such a manner as to apply to the base end of the spool such a spring force, which is in equilibrium with the oil pressure force acting on the tip of the spool so as to keep the spool at the position where the inlet port and the outlet port slightly communicate with each other, and a moving rod (11a) disposed in such a manner as to oppose the base end of the spool. The control valve includes further a solenoid (11) which biases the spool in a direction in which the inlet port and the outlet port communicate completely with each other.
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Inventors:
TAKANO TOSHIRO (JP)
NUNOTANI SADAO (JP)
ISHIZAKI NAOKI (JP)
NUNOTANI SADAO (JP)
ISHIZAKI NAOKI (JP)
Application Number:
PCT/JP1989/001315
Publication Date:
July 12, 1990
Filing Date:
December 27, 1989
Export Citation:
Assignee:
KOMATSU MFG CO LTD (JP)
International Classes:
F16K31/06; (IPC1-7): F16K31/06
Foreign References:
| JPS5145808B1 | 1976-12-06 | |||
| JPS60160414A | 1985-08-22 |
Other References:
See also references of EP 0451272A4
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