Pneumatic diaphragm valve DIASTAR Ten FC PP-H d20-63 SDR11

  Datasheet (PDF)

The Georg Fischer PROGEF Standard DIASTAR Ten FC is a pneumatically actuated diaphragm valve engineered for automated process control and reliable shut-off in demanding industrial piping systems. Operating in Fail-Safe-to-Close mode across dimensions d20 to d63 (DN15 to DN50), this valve pairs a robust beta-PP-H body with a compact pneumatic actuator rated for working pressures up to 10 bar. It provides exceptional resistance when handling aggressive media, chemicals, and industrial effluents.

Technical specifications

The DIASTAR Ten FC actuator delivers fail-safe shut-off using integrated mechanical springs to close the valve automatically whenever control air pressure drops. A central union nut secures the valve housing without external metal fasteners, eliminating corrosion risks in aggressive plant environments.

• Nominal diameter range: d20 to d63 mm (DN15 to DN50)
• Nominal operating pressure: 10 bar (PN10) at 20 degrees Celsius
• Actuation mode: Fail-Safe-to-Close (FC) via preloaded galvanised steel springs
• Diaphragm materials: High-purity EPDM or dual-layer PTFE/EPDM
• Indicator and air feed: Integrated optical position indicator with 90-degree rotatable pneumatic port

Materials and standards

All wetted components are produced from unpigmented beta-nucleated polypropylene homopolymer (beta-PP-H) to maintain long-term hydrostatic strength and superior chemical endurance. The valve meets EN ISO 16138 design standards and conforms to PROGEF system specifications engineered for a 25-year service life in water treatment, chemical processing, and industrial utility applications.

The actuator housing is moulded from flame-retardant, glass-fibre reinforced polypropylene (PPGF), ensuring total external resistance against corrosive plant atmospheres. Internally, the hydrodynamically optimised body geometry lowers overall pressure drops while raising flow coefficients across all pipe diameters.

Installation and jointing

Long metric spigots dimensioned to SDR11 allow rapid and secure integration into PP-H piping networks using conventional butt fusion or contactless infrared (IR) fusion welding. The spigot length facilitates effortless clamping within standard pipe welding machines without disassembling the actuator mechanism.

Direct fusion jointing produces smooth, homogeneous transitions devoid of dead zones or crevice traps, preserving media purity and maintaining system integrity throughout the operating lifecycle.