Pros and Cons of Using Gate Valve

A gate valve is a manual linear-motion valve with a vertical rectangular or circular disc that slides over an opening to stop the flow and serves as the "gate." Gate valves are often used for isolation, fully open or closed, and are not suited for throttling service because the high-velocity flow causes a partially open disc to vibrate and chatter, hastening the erosion of the disc and seating surfaces.

API600 Cast Steel Gate Valve

Pros of Gate valve

For high-pressure and temperature applications, gate valves are adequate. The following are the primary benefits of using a gate valve:

ㆍThey have good cutoff properties.

ㆍLow-pressure drop; very low frictional loss

ㆍLittle maintenance required

ㆍCan function as a bi-directional valve

ㆍLow cost

ㆍAvailable in different sizes

Cons of Gate valve

ㆍIt cannot be used to throttle service.

ㆍSlow disc movement during operation; it takes time to fully open or close the disc.

ㆍLapping and grinding repairs are difficult to do.

ㆍWhen partially open, it may produce noise and vibration.

ㆍSeat and disc wear are risks.

What are the materials used for manufacturing gate valves?

For gate valve construction, various materials are used. Cast carbon steel, cast iron, ductile iron, gunmetal, bronze, alloy steel, stainless steel, and forged steel are examples of common materials utilized. Plumbing services make use of brass and PVC gate valves. The material used in gate valves is mostly determined by the fluid service and the design temperature.

JIS Standard Gate Valve

Codes and standards in relation to gate valve design

The following codes and standards control gate valve design specifications:

ㆍAPI 600/ API 602/ BS5352/ API 603/ API6D/ IS780 /BS 1414 / BS 14846 - Valve Design

ㆍAPI 598 - Valve Pressure Testing

ㆍAPI B16.34 - Valve Pressure Temperature Rating

ㆍANSI B16.10 - Face-to-Face Dimensions

ㆍANSI B16.5 / ASME B 16.47/ BS 10 Table / DIN /IS /JIS Standards - Flange Drilling

ㆍANSI B16.25 and B16.11 - Butt/ Socket Welded End

ㆍANSI B 1.20.1 (BSP/NPT) - Screwed End

A gate valve is made up of three major components:

ㆍBody: Flanged, welded, or bolted connections link the valve body to the piping or equipment.

ㆍBonnet: The bonnet holds the moving parts that are fastened to the body.

ㆍTrim: Valve trim refers to the valve's internal parts that come into direct contact with the fluid and include the stem, gate, disc or wedge, and seat rings.

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