Since isolation levels depend on the risk associated with the intervention, it is important to evaluate carefully the isolation requirement with respect to safety, cost, time and efficiency.
The higher the pressure, the more the sealing elements are pressed together - and the higher are the forces on the ball and the seat. This would not be a big problem, if the valve has not to be [...]
Several Ball Valve basic designs are common and therefore a lot of different solutions are available on the market. Especially the position / orientation of the levers have an enormous influence [...]