Industrial And Pipeline Use 3-pc Reliable ball valve

industrial ball valves, with their 90° rotary operation, reliable sealing, and strong adaptability, serve as core devices for flow control and medium isolation in pipeline systems. They are widely used in industries such as oil, chemical, and natural gas. Their reliability is reflected in structural design, sealing performance, operational adaptability, and ease of maintenance. The following outlines these key aspects.

Core Structure and Reliability Design

• Structural Types: Floating ball designs rely on medium pressure for sealing, suitable for small to medium diameters. Trunnion-mounted or fixed ball designs provide precise ball positioning and stable sealing for high-pressure, large-diameter applications. 3PC three-piece valves allow easy disassembly for maintenance, while top-entry designs enable online servicing without removing the valve from the pipeline, significantly reducing downtime.

• Safety Design: Features include blowout-proof stems, anti-static grounding, and fire-safe sealing compliant with API 607. Double block and bleed structures handle abnormal cavity pressure, while auxiliary sealing and sealant injection enhance reliability under extreme conditions.

Sealing and Operational Adaptability

• Reliable Sealing: Soft seals (PTFE, PCTFE) are suitable for low-temperature and corrosive media, achieving API 6D Class VI leakage rating. Metal hard seals (tungsten carbide, Inconel alloys) handle high temperature and high pressure, meeting ISO 15848-1 Class A zero-leakage standards. Bi-directional sealing ensures system safety.

• Operational Durability: Pressure ratings range from Class 150–2500 (PN10–PN420), temperature range from -196°C to 650°C. Fluorine lining or ceramic coatings resist corrosion and particle erosion, and ball surface hardening (HRC60+) extends service life.

• Stable Operation: Low torque design supports manual, pneumatic, and electric actuation. When combined with positioners, precise flow control is achievable, and emergency shut-off responds within ≤1 second, suitable for automated control and safety interlocks.

Typical Applications and Key Parameters

• Applications: Long-distance oil and gas pipelines, chemical reactor feed control, power generation steam pipelines, pharmaceutical and food-grade transport, suitable for high pressure, low temperature, and highly corrosive conditions.

• Key Parameters: Mechanical life: soft seals ≥100,000 cycles, hard seals ≥50,000 cycles. Full bore design minimizes flow resistance, V-shaped ball cores provide an adjustable ratio of 300:1, and control accuracy reaches ±1%, meeting precision flow control requirements.