Gate Valve Series

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Globe versus Ball & Gate valve

2010-11-01

Between Globe,Ball,and Gate, which type of valve is capable of maintaning Differential Pressure better
Of only those choices the globe is suitable for pressure control purposes.
You can get some pressure differential at nearly closed positions with the other valve types, but too close to fully closed to do you much good.  They will also be subject to erosion and filling the seal areas with dirt when in that position.  It's by far better to use those types of valves in Open or Closed Positions only.  Some patterns of plug valves and butterfly valves would be more effective for throttling, if for some reason you don't want to use a globe type. For on/off the ball valve or gate can be superior, because it is not unknown that some particle, or cavitation erosion  will occur, or dirt will also damage the seals of a globe valve used for throttling, as it does spend most of it's life in some %open position.  Because of those possibilities, I do not consider any type of control valve to be a %100 shutoff, ever, ever.
Typically balls are easier to operate taking only 1/4 turn O/C.  Gates can take many, many more full turns to O/C, but gates can be even cheaper than balls, so make your decision according to cost, or ease of operability for those applications that only need an ON/OFF function.


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