Socket weld ball valves are ball valves that connect to pipelines via socket welding. They are characterized by their compact structure, reliable sealing, and convenient operation, and are widely used in industries such as petroleum, chemical, natural gas, and power.
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Socket weld Ball Valve Structure and Working Principle
Structural Components
Valve Body: The main structure, typically made of cast steel or stainless steel, such as WCB, A105, SS304, SS316, etc.
Ball: The opening and closing element, mostly made of stainless steel (SS304/SS316), with a precision-ground surface to ensure a tight seal.
Seat: Employs an elastic sealing structure (such as PTFE), providing a reliable seal and reducing opening and closing resistance.
Stem: Bottom-mounted structure with a reverse seal design to prevent the stem from being ejected in case of abnormal pressure rise in the valve chamber.
Actuator: Manual, electric, or pneumatically driven, enabling remote or automated control.
Socket weld Ball Valve Working Principle
Rotating the valve stem rotates the ball 90° around its axis, thus opening or closing the valve:
Opening: The ball passage is parallel to the pipeline, allowing fluid to flow freely.
Closed: The ball passage is perpendicular to the pipeline, cutting off the fluid flow.
The ball and seat fit tightly together, ensuring a tight seal. The sealing surface is constantly closed, making it less susceptible to erosion by the medium.
Socket weld Ball Valve Core Features
Connection Method
- Socket Welding: The pipe is inserted into the valve body socket and welded to form a fillet weld. Suitable for small-diameter (DN≤100) pipes, especially for thin-walled pipes (e.g., DN15-DN40), avoiding misalignment and burning problems that can occur with butt welding.
- Reinforcing Function: The socket design enhances local strength, suitable for high-pressure conditions (e.g., PN16-PN64).
Socket weld Ball Valve Performance Advantages
- Low Fluid Resistance: The ball's smooth passage results in a low resistance coefficient and low energy consumption.
- Quick Opening and Closing: Only a 90° rotation is needed to complete the opening and closing action, making operation convenient.
- Reliable Sealing: The elastic valve seat fits tightly with the ball, reducing the risk of leakage over long-term use.
- Compact Structure: Small size and light weight facilitate installation and maintenance.
- Wide Applicability: Handles water, oil, gas, and corrosive liquids (such as nitric acid and acetic acid), with a temperature range of -20℃ to 350℃.
Safety Design
- Anti-Blowout Stem: A reverse-seal structure at the bottom of the valve stem prevents it from coming loose under high pressure.
- Fireproof and Anti-static: Special materials and structural design meet fire and explosion-proof requirements.
- Positioning and Locking: A 90° positioning mechanism and lock can be added to prevent accidental operation.
Socket weld Ball Valve Applications
Industrial Sector
- Petrochemical Industry: Used in high-temperature and high-pressure pipelines to cut off or regulate media such as oil and natural gas.
- Power Industry: Control of critical components such as steam pipelines and boiler feedwater systems.
- Pharmaceutical and Food Industries: Clean pipeline systems to ensure uncontaminated media.
- Paper and Metallurgy: Handles corrosive liquids or high-temperature steam.
Special Operating Conditions
- Small Diameter High-Pressure Pipelines: Such as steam and compressed air pipelines of DN15-DN40.
- Flammable and Explosive Media: Remote safety control achieved through pneumatic or electric actuators. Frequent start-up and shutdown scenarios: such as fluid switching in automated production lines.
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