Title:
FLOW RATE CONTROL VALVE AND ITS CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/1994/001813
Kind Code:
A1
Abstract:
The flow rate of a control valve can be controlled continuously while preventing the working liquid from leaking when the control valve is open. A piston (12) is accommodated slidably in the axial direction in a case (11) which is provided with a first port (13) and a second port (16). The piston (12) is biased by an electromagnet (20). Between the first port (13) and a first liquid chamber (A), there is provided a first switch valve (14B) having a valve seat (14C) which is open to the first liquid chamber (A) and faces one end of the piston (12), and a valve element (14B) which is interlocked with the axial displacement of the piston (12), seated on and separated from the valve seat, operated for communication of the first port (13) with the first liquid chamber (A) and for isolation therebetween. An orifice (15) is provided in the liquid path so as to allow the first liquid chamber (A) to communicate with the second liquid chamber (B).
Inventors:
TAKATA KOJI (JP)
HASHIDA KOICHI (JP)
HASHIDA KOICHI (JP)
Application Number:
PCT/JP1993/000948
Publication Date:
January 20, 1994
Filing Date:
July 09, 1993
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
TAKATA KOJI (JP)
HASHIDA KOICHI (JP)
TAKATA KOJI (JP)
HASHIDA KOICHI (JP)
International Classes:
B60T8/36; B60T8/42; B60T8/44; B60T15/02; G05D7/06; G05D16/10; (IPC1-7): G05D7/01
Foreign References:
| JPH0324459U | 1991-03-13 | |||
| JPS55114647A | 1980-09-04 | |||
| JPS6071360A | 1985-04-23 |
Other References:
See also references of EP 0607451A4
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