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                                                          What Is Fail Open Valve And Fail Close Valve ? | Why we need it ? - YouTube
                                    How to Choose a Fail-Safe Position for your Valves
Solved A. Valve 1 is fail closed and valve 2 is fail open | Chegg.com
                                    Definition of a Valve or what is a valve
                                    How to Tell if a Valve is Open or Closed | Action Sealtite
Control Valve Failure Mode (Fail Lock | | Fail last DC | Fail Last DO
                                    Fail-Safe Position Selection of Control Valve