Large-Diameter Fixed Ball Valves: Reliable “Goalkeepers” in High-Pressure Pipelines
🔧 Features + 🏭 Applications | Understanding Its Core Value in One Article
In harsh operating conditions such as oil and gas, long-distance pipelines, and petrochemical storage and transportation, large-diameter fixed ball valves are playing an increasingly crucial role. Why have they replaced traditional floating ball valves and become the mainstream choice for high-pressure, large-diameter applications? Below is a quick breakdown of its core features and typical applications.
✅ Four Core Features
Fixed Ball + Floating Seat: The ball is supported by a fixed shaft, preventing the medium pressure from pushing the ball towards the seat, resulting in low opening and closing torque and smooth operation. Even in large diameters above DN500, it can still be easily operated manually or electrically.
Bidirectional Double Sealing: Pre-tightened spring-loaded seats are provided upstream and downstream, achieving bidirectional zero-leakage shut-off. Even if the pressure on one side fluctuates abnormally, the seal on the other side remains effective.
Anti-blowout valve stem & fireproof and anti-static properties
The valve stem features an anti-blowout design and comes standard with an anti-static device and API 607/6FA fireproof certification, meeting the highest safety requirements of the oil and gas industry.
Low wear, long service life
The friction surfaces between the valve seat and the ball are hardened (e.g., nickel-based alloy coating, tungsten carbide), maintaining a stable seal even under frequent switching or high-speed erosion conditions.
🏭 Typical Applications
Long-distance natural gas/refined oil pipelines
As main line shut-off valves or ball valves for receiving and dispatching, requiring zero leakage and long maintenance-free periods, fixed ball valves are the preferred choice.
Petrochemical and tank farms
Large-diameter tank root valves and pump inlet/outlet shut-off require corrosion resistance, fire resistance, and low operating torque for easy emergency shut-off.
City gas gate stations & high-pressure regulating stations
Diameters up to DN1200, with turbine or electric actuators for remote control and SCADA linkage.
Metallurgy, power generation, and seawater desalination: Used for circulating water, fly ash, desulfurization, and other media. The fixed ball structure can handle fluids containing solid particles.
💡 Selection Tips: Pressure ratings are typically Class 150 to Class 2500, and diameters range from DN50 to DN1600 (2″ to 64″).
Select the valve body material (WCB, LCB, CF8M, duplex stainless steel, etc.) and ball/seat coating based on the media characteristics.
For applications containing H₂S or wet Cl⁻, NACE MR0175/ISO 15156 anti-sulfur treatment is required.
Whether for new pipeline projects or retrofitting old equipment, choosing the right large-diameter fixed ball valve ensures long-term stability.
Welcome to exchange experiences with peers, and feel free to contact us privately to discuss selection details.
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