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fadzril
Active Contributor

Join Date: Nov 2010
Posts: 18

Potential Servo Valve Problem?

05/13/2011 12:39 AM

Hi,

I am using moog servov valve to control opening for my steam turbine throttle valve (TV).

We are getting servo coil output of -112%.

Is it indicating servo failure?

FYI, the throttle valve all of sudden goes to 40% from 100% opening during operations.
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#1

Re: Potential Servo Valve Problem?

05/13/2011 6:27 AM

What does the original equipment manufacturer's maintenance manual say?

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#2

Re: Potential Servo Valve Problem?

05/13/2011 9:56 AM

1- it could be a problem of dirt in the valve or an inernal ffed-back not any more active the right way. 2- which type of servo valve from Moog ? send a copy of the way the pilot stage is put on main stage.
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