Diaphragm valve DIASTAR TenPlus FC PVDF-

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The Georg Fischer SYGEF Plus DIASTAR TenPlus FC pneumatic diaphragm valve provides process control and ultra-clean fluid management for mission-critical high-purity distributions. Engineered from unpigmented, virgin polyvinylidene fluoride (PVDF-HP), the valve integrates a zero-static tee-pattern body specifically designed to eliminate stagnation zones and minimize dead legs in continuous loop piping systems. Actuation is driven by the DIASTAR TenPlus pneumatic actuator operating in Fail-Safe to Close (FC) mode, utilizing preloaded spring assemblies to secure reliable shut-off under full bidirectional line pressure without requiring constant pilot supply. A central housing nut fastens the actuator assembly directly to the valve body, replacing conventional four-bolt patterns to guarantee uniform diaphragm clamping forces while significantly streamlining inline maintenance. Fluid isolation is accomplished via high-performance PTFE diaphragms backed by elastomeric cushions and white FKM internal sealing, preventing ionic leaching and particulate accumulation. The pneumatic housing includes an auxiliary control port that can be indexed radially at 90-degree increments, allowing flexible air tubing installation within cramped valve manifolds and sub-fab process chases. Precision-molded SDR21 butt fusion spigots enable integration into cleanroom piping systems using non-contact IR Plus infrared welding or bead-and-crevice-free (BCF Plus) fusion techniques. Produced, cleaned with 18-megaohm ultrapure water, and double-bagged under ISO Class 5 cleanroom conditions, this valve is engineered for semiconductor UPW loops, pharmaceutical Water for Injection (WFI), and aggressive chemical metering networks.