Application Gate valves are isolating valves designed for
full closing or opening of working media flow. If the gate valves are used for
regulating or throttling purposes, the manufacturer does not guarantee
tightness of the gate valves. For regulation we recommend to use special
control gate valve type S33.C. Working medium water non-corrosive liquids steam
air gases of group 1 and 2 petroleum and petroleum products The service fluids
shall not contain rough impurities. Technical description The gate valve is an
outside-screw-and-yoke, full bore with flexible wedge and rising stem. The body
and the bonnet are made of castings and are connected by a  flanged joint.
The seating surfaces of the seats and the wedge are made in compliance with API
600. The seat rings are welded into the body. The gate valves are equipped with
a back seat. The gate valves are a bi-directional sealing valves. The
body-bonnet joint and the packing chamber are sealed with asbestos-free gasket
and packing which guarantee a long life service. The requirement for an
automatic body cavity pressure relief shall be specified in the purchase order.
Pressure relief can be achieved by: drilling a hole through one disc of
the wedge, special valve incorporated into the wedge, external bypass, use of
solid wedge. TA-Luft design on request.