SOLENOID-ACTUATED PROPORTIONAL RELIEF VALVE - CATERPILLAR MITSUBISHI LTD

Title:

SOLENOID-ACTUATED PROPORTIONAL RELIEF VALVE

Document Type and Number:

WIPO Patent Application WO/1997/019284

Kind Code:

A1

Abstract:

A solenoid-actuated pilot-operated proportional relief valve comprising an adapter (13) whose upper part includes a guide hole (31) along its axis, which vertically guides a needle (3) in tight contact. The adapter (13) further includes in its lower portion a positioning hole (32) bored coaxially with the needle guide hole (31). A seat (4) is fitted tightly into a positioning hole (33) bored coaxially with a seat member (5). The needle (3) is axially guided in close contact with the needle guide hole (31) in the adapter (13), while the seat (4) is kept in tight contact with the inner surface of the positioning hole (32) in the adapter (13). The lower end of the needle (3) sits well on the seat member (5) without partial contact thus preventing the hunting of the relief valve and the failure of rise in pressure due to the imperfect seating of the needle.

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Inventors:

SHIMADA YOSHIYUKI (JP)
YOSHINO TETSUYA (JP)

Application Number:

PCT/JP1996/002325

Publication Date:

May 29, 1997

Filing Date:

August 20, 1996

Export Citation:

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Assignee:

CATERPILLAR MITSUBISHI LTD (JP)
SHIMADA YOSHIYUKI (JP)
YOSHINO TETSUYA (JP)

International Classes:

F16K17/04; F16K47/02; F16K17/06; F16K17/10; F16K31/06; F16K31/40; (IPC1-7): F16K17/02

Foreign References:

JPS63275865A	1988-11-14
JPH0292174U	1990-07-23

Other References: