A Gate Valve, or Sluice Valve, is operated by turning a handwheel, this handwheel is located on a threaded stem or spindle (Rising or Non Rising) this stem can be located inside or out side (inside / outside screw) the main valve body. This stem connects to a wedge closure device. On operation the wedge is lifted in or out of the path of the fluid (Seawater). When fully open, the gate valve has no obstruction in the flow path.
Gate valves should not be used for regulating (throttling) the flow of liquids having been designed to be fully opened or closed.
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