The three-piece ball valve is a widely used type of valve in fluid control systems. Its structure consists of three main parts: two valve body end caps connected by outer flanges and a central valve body containing the ball. This design uses bolts to fasten the three parts together, forming a complete valve structure.
Compared to one-piece or two-piece ball valves, the biggest advantage of the three-piece ball valve is its ease of disassembly and maintenance. When the central valve body is opened, the ball, seat, and seals can be easily removed without disassembling the entire valve from the piping system. This greatly facilitates cleaning, inspection, and replacement of internal components, making it particularly suitable for environments with high hygiene requirements or where the media is prone to scaling or corrosion.
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3 piece ball valve Technical Parameters
Nominal Diameter: DN6～DN100
Structure: Spherical, Three-piece
Nominal Pressure: 1.6Mpa～6.4Mpa (W.O.G)
Connection Method: Threaded, Flange, Butt Welded, Socket Welded, Clamped
Applicable Temperature: -20～232℃～350℃
Actuation Method: Manual, Pneumatic, Electric
Valve Body Material: Cast Steel, Stainless Steel
Manufacturing Standard: GB (Chinese National Standard), DIN (German Standard), API (American Standard), ANSI (American Standard)
Applicable Media: Water, Oil, Gas, and Some Corrosive Liquids
Wide Applications: Petroleum, Chemical, Power, Environmental Protection, Water Conservancy, Heating, Water Supply and Drainage, Industrial, Machinery
3 piece ball valve Features and Advantages
- Low Fluid Resistance: The resistance coefficient of a three-piece ball valve is equal to that of a pipe section of the same length, providing a low-resistance, straight-through flow path for the medium.
- Simple Structure: Three-piece ball valves are small in size and lightweight, making them easy to operate and maintain.
- Tight and Reliable: The sealing surface materials of ball valves widely use plastics and other sealing materials, providing excellent sealing performance. They are also widely used in vacuum systems.
- Easy Operation: Three-piece ball valves open and close quickly, requiring only a 90° rotation from fully open to fully closed, facilitating remote control.
- Easy Maintenance: The ball valve has a simple structure, and the sealing rings are generally movable, making disassembly and replacement convenient.
- Wide Application Range: Three-piece ball valves are suitable for general working media such as water, solvents, acids, and natural gas, and are also suitable for media operating under harsh conditions, such as oxygen, hydrogen peroxide, methane, and ethylene.
structure of a three-piece ball valve:
Valve body:
It consists of three main parts: two end caps and a middle valve body, usually connected by bolts or threads.
The material is usually 304 or 316 stainless steel, but carbon steel or plastic options are also available.
Sphere:
The core component inside, featuring flow holes that directly control the flow of the medium.
Valve stem:
Connects the ball and the operating handle, transmitting operating force.
Handle:
A manually operated lever, usually with a locking function to prevent accidental operation.
Seals:
Mostly made of PTFE (polytetrafluoroethylene) or other highly wear-resistant materials to ensure high sealing performance of the valve.
Connections:
Including threaded, welded joints or flanges, used to connect valves to piping systems.
Applications of Three-Piece Ball Valves:
Food and Pharmaceutical Industry:
Particularly suitable for production environments with high cleanliness requirements, such as beverage, dairy, and pharmaceutical processing.
Chemical Industry:
Used to control the flow of corrosive fluids or volatile media.
Oil and Gas Industry:
Can handle high-pressure and highly corrosive media, ensuring the reliability of pipeline systems.
Water Treatment Industry:
Used in wastewater treatment and water purification equipment.
General Industrial Piping Systems:
Opening, closing, and regulation control of liquids and gases.
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