DESIGN AND FUNCTION
Series 655
14/112
Edition 23.09.2019
979645EA
3.2
Function
The valve ‘gate’ (1) acts, due to its pendulum motion, as a throttling element and varies the
conductance of the valve opening. The integrated controller IC2 calculates the required gate position
to achieve the set point pressure. Actuation is performed by 2 stepper motors, one for pendulum and
the second for stroke. An encoder monitors the position. This principle ensures fast and accurate
process pressure control.
•
Position A = minimal conductance
•
Position B = leak tight closing, the ‘gate’ (1) with ‘Gate seal’ (2) moves downwards to valve ‘body’
(3).
1
Gate
2
Gate seal
3
Valve body
A
B
1 2 3
