In wastewater and oil & gas industries, fully open or completely closed gate valves (also known as a sluice valve) permit a full flow of liquid or effluents in either direction in a pipeline. It so happens that the valves are mounted in pipelines as isolating valves that should not be used as valves for control or regulation. The gate valve is also used for its ability to provide minimal pressure loss and a free bore. A gate valve may also be known as multiturn valves because a threaded stem provides the valve’s moving portion in the middle of the yoke.
Two types of gate valves:
- Parallel Gate Valves – apply a flat gate between two parallel seats, and a popular kind is the knife gate valve designed with a sharp edge on the bottom of the gate.
- Wedge-Shaped Gate Valves – handle two sloping seats and a partially mismatched inclined gate.