device for driving for doppelsitzventile

摘要

The system to operate a twin-seat valve has two independent move seat plates (3,4) as closures, with a hollow leakage zone (5) between them. The plates can be moved between a fully-open position and independent partially-open settings using drive pistons (205,206) acting on their setting rods (3a,4a). For the partially-open setting at the first seat plate (3), the limit stop position of the second drive piston (205) is adjusted by a limit stop nut (214), in relation to the housing (201,202), at the separate setting unit (200) and from their outer side in the zone between the separate setting unit and the main setting unit (100).