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How does reversing a controller's output signal at the valve affect the valve's fail-safe position upon loss of air?

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Question added by ATHER ALI MIRZA , Technical Instructor Power Operations , Rabigh Power Company
Date Posted: 2013/09/03
Zain UL Abideen Shah
by Zain UL Abideen Shah , TRS Engineer , wellserve OIL FIELD PVT. CO.

Because it Simply taking the Output signal as It Starting input Signal But not From Start You have to do Change In Some Logic of your Controller's But it Dosnt Work On Existing one 

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