Sealing performance is the soul of a check valve, directly impacting system safety and efficiency. Through multi-layered, innovative sealing designs, wafer check valves achieve long-lasting and reliable sealing under a wide range of complex operating conditions.

Multi-Layer Sealing Structure: Building a Solid Defense Line

Synergy of Soft and Hard Sealing:

Flexible Soft Sealing: Materials like rubber or PTFE are commonly used, leveraging their excellent elastic deformation capability to provide initial sealing under low-pressure or normal-temperature conditions, achieving bubble-tight sealing performance.

Metal Hard Sealing: For high-temperature, high-pressure, or media containing particles, sealing surfaces are made from stainless steel overlaid with wear-resistant alloys (like Stellite) or undergo hardening treatment. This hard sealing pair resists erosion and abrasion, offering an extremely long service life and reliable protection in demanding applications.

Precision Design and Manufacturing Process:

The sealing surfaces of the disc and seat are precision-lapped to ensure a perfect fit.

An optimized flow path design guides media flow smoothly, allowing for smooth disc opening and closing, which reduces impact and wear on the sealing surfaces.

The built-in spring (for spring-assisted closure models) not only aids rapid valve closure and prevents water hammer but also provides additional sealing preload, ensuring tight closure even under low system pressure.

Enhanced Design to Tackle Complex Challenges

Vibration Resistance and Wear Compensation: The disc guiding structure is precise, ensuring stable operation and preventing abnormal fluttering caused by vibration. Certain designs also feature automatic wear compensation, maintaining effective sealing surface contact even after prolonged use.

Materials Science and Surface Treatment: Body materials can be selected based on media characteristics, ranging from cast iron and carbon steel to various stainless steels, duplex steels, and even Hastelloy. Advanced surface coating technologies (such as epoxy or Teflon coatings) further enhance the valve body's corrosion resistance.

Rigorous Testing and Verification: Before leaving the factory, all valves undergo strict pressure tests and sealing tests (e.g., gas leakage tests). This ensures their sealing performance fully complies with or even exceeds international or national standards like API or GB, certifying them for service.

The sealing reliability of wafer check valves is no accident. It is the result of the combined effects of precise structural design, scientific material selection, and meticulous manufacturing processes. From soft elastomers to hard alloy surfaces, from precision machining to rigorous performance testing—every step serves the core mission of "reliable sealing," making these valves the trusted "unidirectional guardians" in pipeline systems.