Title:
VALVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2001/009537
Kind Code:
A1
Abstract:
A valve device, wherein a pilot flow amplifying type poppet valve (42) is fitted slidably into a valve housing (40), a damping pressure chamber (61) having a volume varying according to the displacement of the poppet valve (42) is provided between the valve housing (40) and the poppet valve (42), in addition, as a resistance providing part which provides a resistance to a fluid moving between the inside and outside of the damping chamber according to a variation in an internal volume of the damping pressure chamber (61), a clearance (66) is provided between a small diameter part (63) of the poppet valve (42) and an annular projected part (65) on the valve housing (40) side and, according to a variation in volume of the damping pressure chamber (61) caused when the poppet valve (42) is moved, a resistance is provided, by the clearance (66), to the fluid flowing into and out of the damping pressure chamber (61) to provide a damping function to the poppet valve (42), whereby a hunting can be prevented from occurring so as to stabilize the operation of the poppet valve (42).
Inventors:
YOSHINO KAZUNORI (JP)
Application Number:
PCT/JP2000/001815
Publication Date:
February 08, 2001
Filing Date:
March 24, 2000
Export Citation:
Assignee:
CATERPILLAR MITSUBISHI LTD (JP)
YOSHINO KAZUNORI (JP)
YOSHINO KAZUNORI (JP)
International Classes:
F16K31/124; F15B11/02; F15B13/01; F16K17/04; F16K17/34; F16K47/02; (IPC1-7): F16K17/04
Foreign References:
| JPH07103348A | 1995-04-18 | |||
| JP2594954B2 | 1997-03-26 | |||
| JPH0233909B2 | 1990-07-31 | |||
| JPS6145421Y2 | 1986-12-20 | |||
| JP6200458Y2 | ||||
| JP3071587B2 | 2000-07-31 |
Attorney, Agent or Firm:
Kabasawa, Joo (Shinjuku 3-chome Shinjuku-ku, Tokyo, JP)
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