A ball valve that can withstand high operation cycles without leaking through the stem packing.
Description:
Isolation On-Off Ball Valve
Service: Gas
Ansi 1500 WCB Flange 4" (4x3) RJ (R39)
Temp: 100-120 ºF
Pressure: 1700-2150psig
Cycles: 1000-1500 Cycles/year
This is definately a trunion ball valve application.  In case you're not familiar with the difference, a floating ball valve relys on dP across the ball to shift the ball into the downstream seat.  A trunion ball valve has trunion bearings above and below the ball to hold it rigid and the seats (one on each side of the ball) are spring-loaded to push them into the ball.  With 4 cycles/day the floating ball will tend to waller (a technical term from the south) out the upper (only) bearing and the shaft seal.  A trunion ball valve will not have that problem.

MORE NEWS