Pneumatic Diaphragm Valve DIASTAR Ten FC PP-H d20-63

  Datasheet (PDF)

The Georg Fischer PROGEF Standard DIASTAR Ten pneumatic diaphragm valve provides fail-safe-to-close automated flow regulation and absolute isolation in high-purity and corrosive industrial piping systems. Designed for metric pipe networks from d20 up to d63 (DN15 to DN50), this actuated valve combines an isotactic polypropylene homopolymer body with double union socket fusion ends, ensuring maximum process safety, effortless radial installation, and long-term chemical durability under demanding operating pressures up to 10 bar.

Technical specifications

The DIASTAR Ten FC operates in a fail-safe-to-close mode via integrated galvanised steel springs, driving immediate closure upon pilot pressure drop. The optimised internal geometry doubles the flow rate compared to earlier generations, drastically reducing line head losses.

• Function mode: Fail-safe-to-close (FC / normally closed) actuated by internal preloaded springs.
• Nominal working pressure: Rated for line pressures up to 10 bar at 20 degrees Celsius per EN ISO 16138.
• Flow performance: Linear flow characteristic with double the flow coefficient of previous valve designs.
• Control air connection: Pilot air supply ports rotatable at 90-degree increments for versatile tube routing.
• Visual monitoring: Two-colour optical position indicator integrated directly into the upper actuator dome.

Materials and standards

Constructed from pressure-bearing beta-PP-H (isotactic polypropylene homopolymeride) and glass-fibre reinforced polypropylene (PP-GF), the valve meets stringent international standards for industrial pressure piping. Diaphragm options include high-performance EPDM, FKM, and PTFE/EPDM to match specific chemical media.

The robust central housing nut replaces traditional metallic body bolts, completely eliminating external atmospheric corrosion and stress cracking caused by acid washdowns or aggressive vapours. Compliance with EN ISO 16138 guarantees strict sealing integrity, pressure resistance, and long-term hydrostatic strength across an engineered 25-year service life in water applications at 20 degrees Celsius. The material formulation resists demineralised water, aggressive acids, alkalis, and complex industrial effluents across heavy chemical processing lines.

Installation and jointing

Double union ends with metric socket fusion connections enable rapid inline installation and radial removal without disassembling surrounding pipeline runs. The socket fusion joints conform to standard metric polypropylene welding procedures, creating homogeneous and leak-proof connections.

Compact dimensions and rotatable actuator air ports facilitate easy mounting even in dense skids or confined distribution manifolds. Maintenance is exceptionally straightforward: the central union nut allows technicians to inspect, service, or replace diaphragm membranes in-line without unbolting pipe flanges or stressing connected pipework.