Petroleum Zones

Petroleum Zones' Designs

Gate Valve for WellHead & XmasTree

(Specification: API)

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Gate valve:
Also known as a sluice 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 restriction is desired. The gate faces can form a wedge shape or they can be parallel.

Typical gate valves should never be used for regulating flow, unless they are specifically designed for that purpose. On opening the gate valve, the flow path is enlarged in a highly nonlinear manner with respect to percent of opening. Typical gate valves are designed to be fully opened or closed. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low friction loss.

Gate valves may have flanged ends which are drilled according to pipeline compatible flange dimensional standards. Gate valves are typically constructed from cast iron, ductile iron, cast carbon steel, gun metal, stainless steel, alloy steels, and forged steels.

A gate valve called a crown valve or working valve is often placed above the production tee. This valve facilitates installation or dismantling of a lubricator without shutting in the well.

A gate valve is always placed immediately off of the production tee. This valve, called a wing valve, can be used to shut off flow to the production facilities and still allow work down the tree or tubing.

Please send comments or inquiries to: design@petroleumzones.com