Valve failed the seat leakage test

If valve failed the seat leakage test it could be because

a) We don’t have good contact between seating surface & plug. Mating surfaces have not been machined properly.

b) Actuator & valve stem are not properly connected and aligned.

c) Sufficient seat load required to bring the plug & the seat surface together and to hold them tightly under service condition has not been met.

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