Title:
パイロット操作サーボ弁
Document Type and Number:
Japanese Patent JP3638286
Kind Code:
B2
Abstract:
PCT No. PCT/EP95/04454 Sec. 371 Date Sep. 16, 1997 Sec. 102(e) Date Sep. 16, 1997 PCT Filed Nov. 13, 1995 PCT Pub. No. WO96/15373 PCT Pub. Date May 23, 1996A pilot controlled servo-valve has four main flow connections, an axially sliding main control piston with four control edges and a front restoring spring that defines a spring-centered middle position of the main control piston. A control sleeve has ring shaped openings for the first, second and third main flow connections and a front opening for the fourth main flow connection. A first front face of the main control piston is axially opposed to the front opening. A pressure compensation surface is formed by the second front face of the main control piston in a spring chamber. The main control piston applies the pressure in the fourth main flow connection on said pressure compensating surface through a pressure relief channel. A traverse bore connects said pressure relief channel to an auxiliary connection chamber connected to the third main flow connection by the forth control edge. This valve may be space-savingly integrated in a hydraulic block and has a clearly defined middle position, as well as a remarkable dynamic performance.
Inventors:
Bruker, Arsene
Ranfermann, Bernd
Curt tratberger
Post, curl-Heinz
Ranfermann, Bernd
Curt tratberger
Post, curl-Heinz
Application Number:
JP51572996A
Publication Date:
April 13, 2005
Filing Date:
November 13, 1995
Export Citation:
Assignee:
Hydrolux Societa Responsor Sabilita Limiter
International Classes:
F15B13/04; F16K3/26; F15B13/042; (IPC1-7): F15B13/042; F16K3/26
Domestic Patent References:
| JP6341409A | ||||
| JP58218379A | ||||
| JP61140278U | ||||
| JP1229106U | ||||
| JP5377426A |
Foreign References:
| US3010438 | ||||
| US3234968 | ||||
| DE4011908A1 |
Attorney, Agent or Firm:
Hideto Asamura
Hajime Asamura
Yukio Iwamoto
Toru Mori
Hajime Asamura
Yukio Iwamoto
Toru Mori