Diaphragm valve PVDF type 514

  Datasheet (PDF)

The Georg Fischer SYGEF Standard diaphragm valve type 514 is an engineered flow-control solution designed for reliable throttling, regulation, and shut-off of aggressive industrial chemicals and high-purity media. Constructed from unpigmented polyvinylidene fluoride (PVDF), the valve body exhibits outstanding chemical resistance against concentrated acids, halogens, and organic solvents, while operating reliably within a broad temperature window from -20 degrees to +140 degrees Celsius at a nominal pressure rating of PN10. Engineered with metric butt fusion spigots spanning sizes d20 to d63 mm (DN15 to DN50), the valve integrates seamlessly into process lines via conventional butt fusion, infrared IR Plus welding, or bead and crevice-free BCF Plus jointing methods. The internal flow geometry provides up to double the flow coefficient compared to predecessor designs, significantly reducing pressure loss and medium stagnation across the wetted flow path. Actuation is managed manually through an ergonomic handwheel featuring a built-in locking mechanism that securely prevents setpoint drift and accidental tampering during operation. System maintenance is optimized through a compact overall installation length and a single central housing nut that replaces traditional four-bolt bonnet assemblies, permitting rapid diaphragm inspection and radial servicing without stressing adjacent pipework. Fluid barrier integrity relies on a high-grade PTFE diaphragm supported by an elastomeric EPDM or FKM backing, ensuring hermetic sealing, zero metallic contact with the conveyance fluid, and long-term mechanical endurance in chemical processing, deionized water systems, and pharmaceutical purified water applications. For automated process monitoring, the assembly can also be customized with a self-adjusting multifunctional module featuring integrated electrical limit switches.