Diaphragm valve DIASTAR Ten ABS FC PN10 d20-63 mm

  Datasheet (PDF)

The Georg Fischer DIASTAR Ten ABS FC pneumatic diaphragm valve delivers linear flow control and positive shut-off for demanding industrial fluid processes. Operating in a Fail Closed (FC) configuration, this valve is designed for plant engineers and system builders requiring fail-safe operation at a nominal pressure rating of PN10 (10 bar at 20 degrees Celsius). Supplied across Europe by BigWeld, an authorised Georg Fischer distributor, the unit combines robust actuation with outstanding chemical and thermal resilience across metric diameters from d20 to d63 mm.

Technical specifications

The DIASTAR Ten utilizes an integrated spring return mechanism within a glass-fibre reinforced polypropylene (PP-GF) actuator housing to guarantee immediate closure upon loss of pilot air pressure. Its hydrodynamically optimized internal geometry doubles the flow capacity of previous generations, maintaining uniform flow profiles across varying control conditions.

• Actuation mode: Pneumatic Fail Closed (FC) with integrated fail-safe spring return mechanism.
• Nominal pressure: PN10 rating (10 bar at 20 degrees Celsius).
• Flow performance: Optimized internal contour achieving kv-values from 125 l/min (d20) up to 1728 l/min (d63) at a differential pressure of 1 bar.
• Pneumatic ports: Air supply connection rotatable by 90 degrees in any direction for compact pilot tubing installation.
• Maintenance design: Central housing nut configuration eliminating conventional four-screw clamping and torque re-tightening.

Materials and standards

Constructed from industrial-grade acrylonitrile butadiene styrene (ABS) with an EPDM diaphragm, the valve provides exceptional impact strength and ductile behaviour down to low operating temperatures. Flanged ends incorporate glass-fibre reinforced PP-V backing flanges that meet international dimensional and mechanical standards.

The robust valve assembly adheres to standard overall face-to-face dimensions specified by EN 558. Backing flanges conform precisely to ISO 7005 PN 10, EN 1092 PN 10, and DIN 2501 PN 10 for seamless bolting into industrial pipelines. The EPDM diaphragm formulation ensures bubble-tight shut-off, high flexibility, and extensive cycle life under continuous cycling without diaphragm creep or bolt retensioning.

Applications

The DIASTAR Ten ABS FC valve is purpose-engineered for chilled water networks, industrial cooling circuits, and aggressive fluid handling where metallic valves suffer from scale or galvanic corrosion. It delivers reliable isolation and throttling in water treatment plants, marine utilities, and secondary refrigeration lines.

Owing to the corrosion-proof properties of ABS and the smooth internal contour of the diaphragm mechanism, the assembly avoids particulate accumulation and abrasive erosion. It is widely specified across European processing facilities for secondary cooling, drinking water distribution, and chemical treatment dosing skids operating under continuous automated control.