Sliding-stem control valve travel
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All Comments (6)
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it is like an overhaul.. it has to be bench set,, after re- assembly....but they didnt mention it here.. in which you have to inject a certain pressure in which it can be found on the engravement on the valve,,, where the bench set is mark..
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it is like an overhaul.. it has to be bench set,, after re- assembly....but they didnt mention it here..
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It is incomplete
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Thanks alot for sharing the information. It's really very good video.
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CAUTION****** This is contrary to the Fisher Valve Instruction Manual for these valves. There are some real problems with this method of "setting the proper valve travel" that is conflicting with the calculated seat loading, actual process fluid pressures, pressure drop across the valve trim, etc. that goes into calculating the bench set on these actuators. In any instance, it would be wiser to follow the PUBLISHED INSTRUCTION MANUAL from the OEM rather than this instructor.
butzja 1 year ago
@butzja Note that I am not giving step-by-step instuctions for how to set valve travel. I'm simply explaining what happens mechanically when it's set up correctly. If you follow the procedures outlined in the Fisher manual (Type 667 Diaphragm Actuator Sizes 30-76 and 87 Instruction Manual, form 1203, pages 6-8), this is what you get. One should ALWAYS follow the manufacturer's manual!
Also, this discussion does not touch on bench-setting at all, which is what determines seat loading.
BTCInstrumentation 1 year ago