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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Bob Valerius (robert_m_valerius@md.northgrum.com )
Organization:Northrop-Grumman Oceanic & Naval Systems
Date posted: Wed Nov 22 8:04:24 US/Eastern 2000
Subject: Failure Modes of Hydraulic Servo Valves
Message:
Hi, I'm looking for a detailed list of failure modes for hydraulic servo valves. They would be operated on a ship. Thanks.


Reply:

Subject: Servo Valve Failure modes
Reply Posted by: Bruce Dudley (bdudley@alionscience.com )
Organization: Reliability analysis Center
Date Posted: Mon Nov 27 9:30:00 US/Eastern 2000
Message:
In the Reliability Analysis Center's report "Failure Mode/mechanism Distribution, 1997", the failure modes for a hydraulic servo valve are: 60%-Leaking, 20%-No Operation, 10%-Stuck Closed, 10%-Unstable.


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