US Patent No: 5,896,890

Number of patents in Portfolio can not be more than 2000

Pilot-operated servo-valve

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Importance

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Abstract

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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.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MOOG LUXEMBOURG SARLLUXEMBOURG, LU2

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bourkel, Arsene Belvaux, LU 4 22
Lanfermann, Bernd Rees, DE 5 34
Post, Karl-Heinz Kaarst, DE 7 22
Tratberger, Karl Duisburg, DE 4 22

Cited Art Landscape

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

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
WOODWARD GOVERNOR COMPANY (1)
* 6,725,876 Control valve with integrated electro-hydraulic actuator 4 2001
 
ROBERT BOSCH GMBH (1)
* 8,191,579 Directional or flow control valve 0 2007
 
HUSCO INTERNATIONAL INC. (1)
* 7,422,033 Position feedback pilot valve actuator for a spool control valve 4 2004
 
Bosch Rexroth AG (1)
* 6,598,622 Directional valve 2 2001
 
DEERE & COMPANY (1)
6,581,704 Steering controls 8 2001
 
SCHAEFFLER TECHNOLOGIES AG & CO. KG (1)
* 8,244,407 Method for actuating a hydraulic servo system 0 2008
 
United Technologies Corporation (2)
* 8,480,350 Turbofan engine with variable bypass nozzle exit area and method of operation 0 2006
* 2010/0068,039 TURBOFAN ENGINE WITH VARIABLE BYPASS NOZZLE EXIT AREA AND METHOD OF OPERATION 5 2006
* Cited By Examiner