Dear professionals,
Can anyone please advise what are the differences between ANSI150 & JIS10K end stds? I currently have a valve manufactured to ANSI150 & I wish to know if any modifications need to be made for it to conform to JIS10K.
I'd be grateful if anyone can advise me on where to...
I have with me here a set of formulae which relates to upstream & downstream break & seat torques:
For Shaft Downstream:
i. torque tp close v/v is given by:
Tseat= -Tpacking -Tseat -Thandwheel -deltaPmax(bearing torque factor + off balance torque factor)
ii. torque required to open v/v is...
For O2 applications, u might wish to consider the fluid medium:
i. O2-Gas: valves of ductile iron/SS with rubber (i.e. NBR) seating will suffice;
ii. O2-Liquid (-297DegF): 316SS disc with teflon seating will be good.
I hope this will help in a little way.
I will like to put this question out to all valve engineers, in hope of a valued explanation:
1. For a conventional butterfly v/v, is the breakaway & seating torques equal?
2. What equations/formulae can be used to relate the relevance of these 2 torques?
I will be grateful if there is...