III. Product Features

• Trunnion-Mounted Stability: The fixed ball, supported by upper and lower trunnions, eliminates axial movement under high pressure, reducing wear on seats and ensuring consistent sealing. This design is critical for 600LB high-pressure applications, where traditional floating ball valves may suffer from seat damage due to pressure-induced ball displacement.
• PTFE Sealing Excellence: PTFE seals offer exceptional chemical resistance, making the valve compatible with a wide range of media including oils, gases, and water. The low friction coefficient of PTFE minimizes wear during operation, extending the valve’s service life and maintaining tight shutoff even after thousands of cycles.
• Broad Material Versatility: With options in WCB carbon steel and stainless steel (SS304, SS316, SS316L), the valve adapts to diverse environments—from cost-sensitive general industrial use (WCB) to corrosive settings such as coastal gas pipelines or chemical plants (SS316/SS316L).
• High-Pressure and High-Temperature Tolerance: Rated for 150LB to 600LB pressure and designed for high-temperature media, the valve performs reliably in processes like steam-assisted oil recovery, high-pressure gas transmission, and industrial boiler systems.
• Flange Connection Compatibility: Flange ends conform to ANSI, BS, DIN, and JIS standards, ensuring seamless integration with global pipeline systems. This compatibility reduces installation complexity, especially in multinational industrial projects.
• Manual Operation Precision: The manual quarter-turn mechanism allows for quick, intuitive control—critical for applications requiring rapid shutoff in emergencies. The handwheel is designed for ergonomic operation, minimizing effort even for large-diameter valves (DN900).

IV. Manufacturing Process

• Material Selection and Inspection: Raw materials (WCB, SS304, SS316, SS316L) undergo rigorous testing to verify chemical composition, mechanical strength, and corrosion resistance. For example, stainless steel is tested for chromium and nickel content to ensure compliance with ASTM standards, while WCB carbon steel is inspected for tensile strength and impact resistance.
• Precision Casting: Valve bodies and balls are produced using precision casting techniques, ensuring uniform material density and dimensional accuracy. This process eliminates internal defects (e.g., porosity) that could compromise pressure resistance, especially critical for high-pressure 600LB applications.
• Trunnion and Seat Machining: Trunnions are machined to tight tolerances (±0.02mm) using CNC lathes, ensuring proper alignment with the ball and valve body. Seat surfaces are ground to a smooth finish (Ra 0.8μm or better) to enhance PTFE seal contact and reduce leakage.
• Assembly and Seal Integration: PTFE seals are precision-molded to match seat dimensions, ensuring a snug fit. During assembly, the ball is aligned with trunnions to guarantee 90-degree rotation without binding, and the manual operation mechanism is calibrated to ensure smooth, consistent movement.
• Pressure and Leak Testing: Each valve undergoes rigorous testing in accordance with industry standards:
  • Shell test: 1.5 times the nominal pressure to verify the valve body’s integrity.
  • Seat test: 1.1 times the nominal pressure to ensure zero leakage across the PTFE seals.
  • Operation test: Verification of smooth 90-degree rotation and proper shutoff functionality.
• Surface Treatment: Carbon steel components (WCB) receive anti-corrosion treatments such as painting or galvanizing to resist environmental degradation, while stainless steel parts undergo passivation to enhance their natural corrosion resistance.