why must gate vale must be open &ball valve half-open duratin in test
why must gate vale must be open &ball valve half-open duratin in test
(OP)
in testin the line in test package why gate&glob must be open and ball valve half-open?
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why must gate vale must be open &ball valve half-open duratin in test
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RE: why must gate vale must be open &ball valve half-open duratin in test
If my interpretation is correct, your observation is probably a result of the different pressure drops across the seat which will be specific to the internal physical arrangement of the valve. A ball valve could be the least pressure drop just because it might have a full size port which aligns precisely with the pipe, whereas the other two valves have more complicated flow paths and protrusions to create internal turbulence (pressure drop). Actually, I would expect the ball to be the best and the globe valve to be the worst.
David
RE: why must gate vale must be open &ball valve half-open duratin in test
More details please.
Mark
RE: why must gate vale must be open &ball valve half-open duratin in test
A possible explaination:
- Gate valve full open (and on the back seat) to keep test pressure off the packing gland.
- Globe valve full open (and on the back seat) to keep pressure off the packing gland.
- Ball valve part open to pressurize the body cavity (full open doesn't pressurize the area between the ball and the casing).
RE: why must gate vale must be open &ball valve half-open duratin in test
RE: why must gate vale must be open &ball valve half-open duratin in test
RE: why must gate vale must be open &ball valve half-open duratin in test
RE: why must gate vale must be open &ball valve half-open duratin in test