A multi-turn valve which has a gate-like disk and two seats to close the valve. The gate moves linearly, perpendicular to the direction of flow.
This type of valve is normally used in the fully opened or fully closed position; it is not suited to throttling applications. Gate valves provide robust
sealing, and are used extensively in the petrochemical industries. This class of valves also includes knife gate valves, conduit gate valves and
wedge gate valves. Knife gate valves have much thinner gates with knife-like edge, making them suited to use with floating solids, e.g., as in the pulp & paper industries. Conduit gate valves have a rectangular disk as the closing element. one
half of the disk is solid, to close the valve, the other has a circular port, which can be used to open the valve.
Wedge gate valves have a wedge-shaped gate which "wedges" between floating seats to close the valve tightly.

Class 2500 Cast Steel Gate Valve's specification is as follow:

OS&Y, Rising Stem, Flexible or Solid Wedge, Pressure Seal, Threaded or Welded Seat Ring
Standards Compliance:
Basic Design: API600, BS1414
Face to Face Dimension: ASME/ANSI B16.10
End to End Dimension:  ASME/ANSI B16.10
End Flange Dimensions: ASME/ANSI B16.5
B.W.Ends Dimensions: AMSE/ANSI B16.25
Manufacturing to NACE MR-01-75 on request