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There are actually three versions of port size: Regular port- when ball valves came out, this was the standard port size which was, as said in other strings, 1 port size smaller than the line size. Full port- as logic has it, a full line size according to sch 40 pipe. Note, a full port valve is...

Can anyone tell me how Rev 5 differs from Rev 4?

What is the difference between A351 and SA351? Is there differences in casting material or a treatement after casting.

I have had several ball valves fail because the seat "extrudes" when we close the valve on 150# saturated steam service. When closing the valve, the ball lip graps part of the seat and deforms seat, not letting valve close completly. Is this a condensate problem, P/T rating of seat material or...

Check with ISA. They offer control valve courses that are more generic.

The bench set is correctly set on a valve when the actuator is not attached to the valve body. I would suggest you get a maintenance manual from the Fisher web site to properly follow all the procedures and follow safety requirements. Benchset that is not set correctly can cause valve leakage...

I suggest you step back and look at your loop dynamics before deciding on actuator design. Even is sped up, an electric actuator will be slow and can cause loop instability on a fast loop, like pressure or flow. If your process is stable and does not have large upsets, then electric will work...