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.
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:
- They have good cutoff properties.
- Low-pressure drop; very low frictional loss
- Little maintenance required
- Can function as a bi-directional valve
- Low cost
- Available in a different sizes
Cons of Gate valve
- It cannot be used to throttle service.
- Slow disc movement during operation; it takes time to fully open or close the disc.
- Lapping and grinding repairs are difficult to do.
- When partially open, it may produce noise and vibration.
- Seat 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.
Codes and standards in relation to gate valve design
The following codes and standards control gate valve design specifications:
- API 600/ API 602/ BS5352/ API 603/ API6D/ IS780 /BS 1414 / BS 14846 – Valve Design
- API 598 – Valve Pressure Testing
- API B16.34 – Valve Pressure Temperature Rating
- ANSI B16.10 – Face to Face Dimensions
- ANSI B16.5 / ASME B 16.47/ BS 10 Table / DIN /IS /JIS Standards – Flange Drilling
- ANSI B16.25 and B16.11 – Butt/ Socket Welded End
- ANSI B 1.20.1 (BSP/NPT) – Screwed End
A gate valve is made up of three major components:
- Body: Flanged, welded, or bolted connections link the valve body to the piping or equipment.
- Bonnet: The bonnet holds the moving parts that are fastened to the body.
- Trim: Valve trim refers to the valve 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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