Forged steel fixed ball valves are valves with valve bodies manufactured using forging processes and balls with fixed shafts. They are suitable for industrial pipeline systems with high pressure, high temperature, and highly corrosive media. They feature bidirectional sealing, pressure resistance, impact resistance, long service life, fire resistance, and antistatic properties, and are widely used in industries such as petroleum, natural gas, chemical, metallurgy, and power.
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Forged steel fixed ball valves Technical parameters
Design standard: GB/T 12237 GB/T 19672 API 6D
Structure length: GB/T 12221 API 6D ASME B16.10
Flange size: GB/T 9113 JB/T 79 ASME B16.5 ASME B16.47
Test and inspection: JB/T 9092 GB/T 19672 API 598 API 6D
Performance parameter
Main material: 25, A105
Nominal diameter: DN50~1200mm
Nominal pressure: PN1.6~25MPa
Applicable temperature: -196℃~+121℃
Applicable medium: water, oil, natural gas, corrosive medium, etc
Forged steel fixed ball valves Structural Features
- Spherical Fixed Design: The ball is supported by upper and lower bearings, preventing displacement under pressure. The valve seat is pressed tightly against the ball by an elastic element (such as a spring) or the medium pressure, achieving a seal. This design reduces friction, lowers operating torque, and extends service life.
- Dual Seat Seal: Forged steel fixed ball valves typically employ a bidirectional sealing structure, with each valve seat capable of independent sealing, ensuring reliable operation even under high pressure, high temperature, or corrosive media environments.
- Fireproof and Anti-static Design: The valve seat sealing ring utilizes a metal-to-metal secondary sealing structure, maintaining sealing performance even in extreme conditions such as fires. Simultaneously, an anti-static device is installed between the valve body and the valve stem to prevent safety hazards caused by static electricity.
- Full Bore or Reduced Bore Design: Depending on operating conditions, the valve can be designed as a full bore (flow channel matches the pipe's inner diameter) or a reduced bore (flow channel is smaller than the pipe's inner diameter) to meet different flow and pressure requirements.
Forged steel fixed ball valves Working Principle
- Open State: The ball rotates 90°, connecting the flow channel to the pipeline, allowing the medium to flow smoothly.
- Closed State: The ball rotates 90°, its surface contacting the valve seat sealing surface, cutting off the medium flow.
- Sealing Mechanism: The valve seat presses the ball tightly against the spring preload or medium pressure, forming a reliable seal. Some valves are also equipped with a secondary sealing grease port, allowing grease to be injected to restore sealing performance when the sealing surface is worn.
Performance Advantages
Pressure and Impact Resistance
The forged steel valve body has a dense structure and high strength, capable of withstanding extreme pressure environments (such as the high-pressure conditions of long-distance natural gas pipelines), preventing valve body deformation or rupture.
Long Service Life and Low Maintenance
Wear-resistant design (such as PTFE bearings) reduces friction loss, and the full-bore structure (flow orifice diameter equal to pipeline diameter) reduces media flow resistance and extends service life.
Modular design supports quick replacement of valve seat modules, reducing downtime and lowering total life cycle costs.
Fireproof and Anti-static Safety Design
Certified by API 607/6FA for fire resistance, the metal seal remains effective even after the soft seal is burned, preventing the spread of fire.
An anti-static device discharges the ball's charge, preventing sparks from igniting an explosion, suitable for flammable and explosive media (such as hydrogen and ethylene).
Automatic Pressure Relief Function
When the pressure in the cavity rises abnormally, the single-seal structure valve seat automatically disengages from the ball to relieve pressure, while the double-seal structure relieves pressure through an additional safety valve on the valve body, ensuring system safety.
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