DESIGN AND FUNCTION
Series 140
10/43
Edition 14.07.2020
875067EA
3.2
Function
The valve features the VATLOCK sealing technology.
This means, the valve is mechanically locked in the closed position. In the open position,
the mechanism is not locked.
Leaf springs hold gate and counter-plate against the carriage with the ball retainers. The
ball pairs are in the detents.
For closing, the mechanism is moved forward into the closing position. The locking starts
after the leaf spring stop touches the body. The ball retainers move the ball pairs out of the
detents. Gate and counter-plate are spread apart. The gate seal is pressed against the
sealing surface without scuffing.
The arrangement of the ball pairs ensures an increase of the sealing force with vacuum on
either side of the gate.
During opening the movements proceed in the reverse order. See «Figure 3-3».
1 Valve gate
2 Counter-plate
3 Leaf springs
4 Ball pairs
5 Ball detents
6 Crank bolt
7 Gate seal
8 Actuator
Valve seat side
Figure 3-3
1
2
3
4
6
7
8
5