OZB butterfly valves are designed as single or double flange types and supplied with patented o-ring channel and seal for maximum impermeability.
Butterfly valves are available from 100mm to 400mm diameter. 
Butterfly valves;

BV.F…NN: with EPDM disc, EPDM seal
BV.F…CN: with steel disc, EPDM seal
BV.F…AF: with stainless steel disc, Nitrile seal
BV.F…CV: with steel disc, viton seal
BV.F…AV: with stainless steel disc, viton seal valves are available.

Butterfly valves can be used with manual or pneumatic actuators as needed.
ACM: Manual
ACP: Pneumatic
MS: Microswitch

Valves are used for discharging and/or controlling the flow of bulk solid materials inside channels.

OZB valves can be used in silos, hoppers, weighing hoppers, inlet and outlet of screw conveyors and other similar applications.