wT 2575/11
Page
5
2.)
Inelastic sealing ring respective body flange is mounted upstream:
The fluid pressure acts against the preloading force of the elastic sealing element located
downstream.
If the force of the fluid pressure is higher than the preloading force, the ball lifts from the sealing
ring and only the downstream located sealing element performs the primary sealing function.
Due to the fact that this condition occurs at high differential pressures the surface pressure
between sealing element and ball is high enough to enable an effective sealing.
At high differential pressures the preloading force of the elastic sealing element is high enough
to press the ball against the upstream located sealing ring. A second primary sealing area is
created, which enables an outstanding effective sealing!
High differential pressures: FV-F1 < F1 …ball lifts from upstream located sealing ring
Low differential pressures: FV-F1 > F1 …upstream located sealing ring is in full function
KLINGER Ballostar
®
KHE ball valves are basically maintenance free and can be pressurized in both
flow directions. The U-sleeve which is drawn onto the supporting ring is completely chambered and
seals the pitch flange against the outside. Additionally ball valves of type KHE have secondary graphite
sealing between body and flange end piece.
Occurring forces:
F1…Fluid force acting on ball
Fv…Spring force of sealing
element
Fv-F1…Total force, which acts
onto the sealing ring and
against fluid pressure
