A gate valve is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar, so gate valves are often used when a straight-line flow of fluid and minimum restric?tion is desired. The gate faces can form a wedge shape or they can be parallel. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. This means that flow rate does not change evenly with stem travel. Also, a partially open gate disk tends to vibrate from the fluid flow. Most of the flow change occurs near shutoff with a relatively high fluid velocity causing disk and seat wear and eventual leakage if used to regulate flow. Typical gate valves are designed to be fully opened or closed.

Specification
Suitable medium: water, oil, steam and non-corrosive media
Working temperature: ≤425℃
Nominal pressure: PN16
Connection: Russian standard 12815-80
Sealing: RussianD9544-93
Main Parts material
Body, bonnet, gland: carbon steel 20#
Disc, Disc seal: 2Cr13 or stainless steel304
Stem: 2Cr13