VAT 11136 E01/08 Series, Инструкции по установке, эксплуатации и обслуживанию

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Series 111 DESIGN AND FUNCTION
984134EA Edition 03.02.2021 7/24
3 Design and Function
3.1 Design
1 Sealing surface
2 Valve body
3 Bonnet flange
4 Actuator
Figure 3-1
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 3-2».
1 Gate
2 Counter-plate
3 Leaf springs
4 Ball pairs
5 Ball detents
6 Gate seal
7 Spring stop
Valve seat side
Figure 3-2