US Patent No: 5,896,890

Number of patents in Portfolio can not be more than 2000

Pilot-operated servo-valve

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A 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.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
MOOG LUXEMBOURG SARLLUXEMBOURG, LU6

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bourkel, Arsene Belvaux, LU 4 21
Lanfermann, Bernd Rees, DE 5 32
Post, Karl-Heinz Kaarst, DE 7 20
Tratberger, Karl Duisburg, DE 4 21

Cited Art Landscape

Patent Info (Count) # Cites Year
 
MOOG LUXEMBOURG SARL (1)
5,445,188 Pilot operated servo valve 9 1994

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
BOSCH REXROTH AG (1)
6,598,622 Directional valve 2 2001
 
DEERE & COMPANY (1)
6,581,704 Steering controls 8 2001
 
HUSCO INTERNATIONAL, INC. (1)
7,422,033 Position feedback pilot valve actuator for a spool control valve 4 2004
 
ROBERT BOSCH GMBH (1)
8,191,579 Directional or flow control valve 0 2007
 
SCHAEFFLER TECHNOLOGIES AG & CO. KG (1)
8,244,407 Method for actuating a hydraulic servo system 0 2008
 
UNITED TECHNOLOGIES CORPORATION (1)
8,480,350 Turbofan engine with variable bypass nozzle exit area and method of operation 0 2006
 
WOODWARD GOVERNOR COMPANY (1)
6,725,876 Control valve with integrated electro-hydraulic actuator 3 2001

Full Text

 
loading....