The floating ball valve design is based on the concept that both seat preload and the line pressure contribute to a compressive force between the ball and seat to create a bubble tight shut-off at low and high pressure drop. The line pressure forces the ball to the downstream seat, the seat flexes and create the seal. The upstream seat is forced forward, allowing the pressure to penetrate from behind through the groove and into the body cavity, relieving the load and reducing its wear.
Material of construction for valves (Shell):
ASTM A 216 Gr WCB, WCC, ASTM A 352 Gr LCB, LCC, LC1, LC2, LC3
ASTM A 217 Gr WC1, WC6, WC9, C5, C12, C12A, CA15
ASTM A 351 Gr CF8, CF8M, CF3, CF3M, CF8C, CG8M, CG3M, CN7M etc
Duplex stainless steel
ASTM A 351 Gr CD4MCu, CK3MCuN (any other material on customer's request)
C.I. IS 210 Gr. FG200
Also available in forged steel for below 2 inch size valve.