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How does one calculate opening /closing time in control butterfly valve & on -off butterfly valve

Can handwheel be top mounted for rack & pinion actuator

hello, Why we don't have running torque for rack & pinion actuator while the same is applicable for scotch yoke type actuator

I am really sorry for not making myself clear over the doubt. For example one ball valve with FC position Torque BTO 36000N.m ETC 14400N.m ETO 14400N.m AST: 60000 N.m AET: 18000 N.m SST: 36000 N.m SET:24000 n.m if MAST value is 58584 N.m will the actuator work. above is hypothetical data.

Hello Bcd, Thanks for the reply. yes the MAST has to do with the actuator torque but my question is which of the torque should be considered AST, AET, SST & SET. Also as seen my post, fail safe position plays a role. if AST > MAST for fail safe close, then the actuator will work or not.

Please let me know if the same leakage standard is applicable for on-off type butterfly valve

What is difference between Nominated Cv, rated Cv & Calculated Cv. My understanding goes like this:- Nominated Cv:The valve CV Calculated Cv: the Cv based on the process parameters calculation

What is MAST value & how does it affect the actuator selection for ball & butterfly valves? As per my understanding: MAST: MAST(Maximum allowable stem shear torque). hence while going for the actuator selection,one can summarized as below:- Ball valves/ Butterfly valves: Fail to close BTO < AST...

What is swing through, step seated, angle seated,seated type of disc in butterfly valves