Wafer check valve type 369 PVDF V4A spring

  Datasheet (PDF)

Georg Fischer SYGEF Standard Type 369 wafer check valves engineered from unpigmented polyvinylidene fluoride (PVDF) and fitted with an internal V4A grade stainless steel 316 spring provide dependable non-return flow control across demanding industrial pipework. Specifically configured for intermediate installation between flange adaptors, the wafer-pattern design allows compact integration in tight spaces while delivering excellent chemical resistance against aggressive acids, halogens, and high-purity media. The mechanical design incorporates a precision PVDF sealing disc and an integrated V4A spring reset mechanism to ensure rapid, positive shut-off against reverse flow even under low differential pressure regimes.

Constructed for robust service in chemical processing, microelectronics, pharmaceutical water loops, and semiconductor manufacturing, the high-density PVDF body withstands operating temperatures from -20 degrees C to +140 degrees C. The valve body features dedicated supporting eyelets to streamline alignment and handling during installation between flange assemblies. Sealing integrity across the closing plane is maintained by durable FKM elastomeric seals, ensuring zero leakage and high resilience against medium-induced chemical degradation.

The internal V4A stainless steel closing spring maintains proactive disc positioning during flow deceleration, enabling reliable operation in both horizontal and vertical piping orientations. This spring-assisted return mechanism dampens pulsation tendencies and prevents fluid reverse migration across continuous industrial supply lines. Manufactured according to strict thermoplastic quality protocols, the SYGEF Standard Type 369 assembly provides outstanding thermal stability, physiological non-toxicity, and long-term reliability in high-purity chemical distribution systems, deionised water processing, and aggressive fluid transport lines.