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Valve Back Pressure 2010-10-14
In normal conditions (not limitated as in critical/cavitating/flashing cases) there is a relation between flow and pressure drop and providing you get a curve CV/Aperture it shouldn't be difficult to
Trunion Mounted ball Valve 2010-10-14
A trunnion mounted valve means that the ball is constrained by bearings and is only allowed to rotate. The bearings act on the trunions .
DPE Seat Ball valves 2010-10-14
Often there is confusion regarding DPE (double piston effect) seats, and DBB (double block and bleed), and we now have DIB-1 and DIB-2 in Annex B of ISO 14313/API 6D in the mix.
valve torque leading factors 2010-10-13
Ball valves torque is determined by the seat material, the ball material, the process fluid lubricating (or fouling) the seats, the pressure differential loading the ball against the seat, the design
150# ball valves - trunnion vs floating 2010-10-13
most low pressure applications request 2 piece floating ball valves and when not specified I've always sold the 2 piece floater. What instances would a 150# or 300# trunnion be the preferred design.
Description clarification on Ball Valves Primary/Secondary seal 2010-10-13
a description for the seating of a 30inch ball valve as Primary metal and secondary soft. Does it mean that the ball is soft seated.
History of Ball Valves 2010-10-13
The first spherical ball-type valve >was patented in 1871 by John Warren and assigned jointly to John Chapman, the founder of Chapman Valve Co.
leakage in metal seated ball valve 2010-10-13
We are having really very tough time while producing small metal seated ball valves in the range of 3/4" class 150(Floaters) to 2" class 300(trunnion).
