New Current Interesting Link - Ball Valve Controllers

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Ball Valve Controllers

Excerpt:

"Bidirectional valve operation is needed for proper use of cryogenic ball valves. These are valves with a small drain hole drilled into the ball at right angles to the main channel. When the valve is closed, cryogenic fluid that otherwise would be trapped in the valve can drain to the exit side through the drain hole. Without a drain hole, the fluid heats at ambient temperature, pressures increases and the valve seating bursts. To keep the drain hole on the exit side, the ball must be turned back from the opened to the closed position. A drain hole on the pressurized inlet side of the valve will not drain the ball channel." Received on Thu Jan 20 19:21:00 2005