III. Product Features

• Triple Eccentric Sealing Excellence: The triple eccentric design—incorporating offsets in the valve stem, disc, and sealing surface—eliminates contact between the disc and seat during opening and closing, reducing friction and wear. This results in a tight, metal-to-metal hard seal that achieves bubble-tight shutoff, even after repeated cycles, making it suitable for applications where leakage could compromise system efficiency or safety.
• Wafer Lug Connection Advantage: The wafer design allows for compact installation between pipeline flanges, reducing space requirements compared to flanged valves. The integrated lugs provide additional structural support, enabling the valve to withstand pipeline loads independently and function as a temporary blind flange when closed, simplifying system maintenance and isolation.
• Worm Gear Operation Precision: The worm gear drive offers smooth, controlled actuation with reduced operating torque, allowing for precise flow regulation. Its self-locking capability prevents backdrive from line pressure, ensuring the valve remains in the desired position, critical for maintaining consistent flow rates in automated or manual systems.
• Broad Temperature and Pressure Adaptability: With a temperature range of -29°C to 425°C and pressure ratings of 150lb and 300lb, the valve performs reliably in both extreme cold (e.g., seawater in cold climates) and high-heat (e.g., industrial steam) environments, eliminating the need for multiple valve types in mixed-condition systems.
• Dual Material Options: Stainless steel bodies provide superior corrosion resistance, making them ideal for seawater, chemical-laden media, or outdoor installations where rust is a concern. Carbon steel bodies offer cost-effective durability for general industrial applications with milder media, ensuring optimal performance at a lower price point.
• Compliance with International Standards: Adherence to API 609, ANSI B16.5, and API 598 ensures compatibility with global industrial systems, facilitating integration into existing pipelines and reducing installation complexity for multinational projects.

IV. Manufacturing Process

• Material Selection and Inspection: Raw materials (stainless steel and carbon steel) are selected based on their mechanical properties, corrosion resistance, and temperature tolerance. Stainless steel grades are chosen for their ability to withstand seawater and chemical exposure, while carbon steel is selected for its strength in general applications. All materials undergo rigorous inspection, including chemical composition analysis and mechanical testing, to verify compliance with standards.
• Precision Machining of Eccentric Components: The triple eccentric structure requires high-precision machining to ensure accurate offsets between the stem, disc, and seat. Advanced CNC machining centers are used to fabricate the valve body, disc, and stem, maintaining tight tolerances (within ±0.01mm) to ensure proper alignment and sealing. The sealing surface of the disc and seat undergoes specialized grinding to achieve a smooth finish, critical for metal-to-metal sealing.
• Worm Gear Assembly and Calibration: The worm gear mechanism is assembled with precision, ensuring meshing gears operate with minimal backlash. This assembly is calibrated to ensure consistent torque requirements across the valve’s operating range, with tests conducted to verify the self-locking feature under varying pressures.
• Sealing Surface Treatment: For metal hard sealing, the disc and seat surfaces are treated with processes such as carburizing or nitriding to enhance hardness (up to HRC 55-60), improving wear resistance and extending service life. This treatment ensures the sealing surface remains effective even after thousands of cycles.
• Pressure Testing and Quality Control: Each valve undergoes comprehensive testing in accordance with API 598. Shell tests verify the valve body’s integrity under 1.5 times the nominal pressure, while seal tests (conducted at 1.1 times the nominal pressure) ensure zero leakage. Additional tests include operation testing to verify smooth actuation and dimensional checks to confirm compliance with ANSI B16.10 and B16.5 standards.