PVDF Diaphragm valve type 519

  Datasheet (PDF)

The Georg Fischer SYGEF Plus Diaphragm valve type 519 is an engineered high-purity flow control solution fabricated from unpigmented, virgin PVDF-HP (polyvinylidene fluoride) designed for critical distribution loops in semiconductor, pharmaceutical, and biotechnology installations. Configured with an integrated T-pattern body, the valve ensures the smallest possible dead space between the main distribution run and the point-of-use branch, preventing bacterial contamination and stagnant fluid entrapment. Engineered with butt fusion spigots in SDR21, this valve integrates seamlessly into ultra-pure water (UPW, WFI, PW) and aggressive media piping systems using infrared IR Plus or bead-and-crevice-free BCF Plus fusion jointing methods. Operational control is governed by an ergonomic manual handwheel equipped with an integrated locking mechanism that prevents unintended position adjustments during process cycles. The valve mechanism features an advanced assembly architecture where a single central housing nut replaces traditional four-bolt patterns, establishing uniform circumferential compression over the diaphragm and facilitating rapid servicing without body distortion. High-integrity sealing is delivered across an operating temperature range of -20 degrees to 140 degrees Celsius, utilizing high-grade PTFE diaphragms backed by elastomeric EPDM or FKM supports to ensure bubble-tight bi-directional isolation and superior chemical inertia against hot sanitization fluids, ozone, pure steam, and aggressive media. Certified for cleanroom manufacturing under ISO Class 5 conditions and double-bagged to maintain ultra-clean surface integrity, the valve provides exceptional hydraulic efficiency with double the flow rate capacity of earlier generations, making it an indispensable component for sanitary sampling, loop isolation, and point-of-use take-off lines.