wT 2575/11
Page
3
FUNCTIONAL PRINCIPLE
Because of the
ELASTIC SEALING SYSTEM,
the KLINGER Ballostar
®
KHE ball valve is absolutely
leak tight at high, but also at extremely low pressures. The required contact forces between sealing ring
and ball are created by the differential pressure in the ball valve. For the
FLOATING BALL
sealing
principle it is important that the shut-off device is freely moveable. The sealing rings perform two
functions at the same time: They guide the ball and absorb bearing forces.
FORCE FLOW
The forces which are absorbed by the sealing rings increase with larger nominal diameters (DN, NPS).
Therefore the floating ball design is only used for small sized ball valves. To achieve a high service life
and to reduce the operating torques for pivot movements, the floating ball design is only used for sizes
up to DN 125. For larger sizes lower costs in production face the significant higher costs for increasing
the moment of force to surmount the high operating torques. The increased amount of friction caused by
high loading pressures additionally leads to a low service life and a poor number of shifting cycles.
