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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).
Extreme temp challenges for stuffing boxes 2010-10-11
Technor finds a sub-sea niche 2010-10-11
Severn Ball Valves Expands Team 2010-10-11
