PP-H Pneumatic Diaphragm Valve DIASTAR Six FC d25-63 PN6

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Pneumatic PP-H diaphragm valves Georg Fischer PROGEF Standard DIASTAR Six FC deliver automated flow regulation and tight shut-off in demanding industrial process piping. Engineered with an isotactic beta-PP-H (polypropylene homopolymer) body and SDR11 butt fusion spigots, this valve configuration covers metric dimensions d25 to d63 (DN20 to DN50 equivalent) for nominal working pressures up to 6 bar (PN6). The fail-safe-to-close (FC) actuation is powered by an integrated glass-fibre reinforced polypropylene (PPGF) pneumatic actuator housing incorporating a preloaded galvanised steel spring set, guaranteeing immediate mechanical closure upon control air pressure loss.

The valve architecture incorporates a central PPGF union nut connection that joins the actuator housing directly to the valve body, entirely eliminating metal fasteners and external bolts. This plastic construction eliminates external atmospheric corrosion risks caused by acid vapours, chemical washdowns, or harsh marine air. Inside the body, a high-purity EPDM elastomer diaphragm provides durable sealing across abrasive slurries, pure water, and corrosive media while insulating operating components from process contact. The hydrodynamic internal weir profile provides double the flow capacity of conventional diaphragm valves, minimising pressure drop across the installation.

Designed for high operational reliability across chemical processing, industrial effluent management, and industrial water treatment installations, the DIASTAR Six FC features a 90 degrees indexable control air supply port that simplifies pneumatic line routing in confined pipe racks. An integrated optical position indicator provides immediate visual confirmation of the open and closed status. The butt fusion SDR11 spigots ensure full compatibility with standard heated tool butt welding and non-contact infrared (IR) fusion joining methods, ensuring homogenous, leak-free piping joints. BigWeld supplies the complete PROGEF Standard piping and valve range across Europe for critical thermoplastic infrastructure.