Diaphragm valve type 519 PP-H PROGEF

  Datasheet (PDF)

The Georg Fischer PROGEF Standard diaphragm valve type 519 is an advanced flow-control solution engineered for chemical distribution, industrial water treatment, and process piping. Built around an innovative T-body configuration, this valve eliminates dead leg zones where media stagnation and particulate accumulation occur in conventional branch lines. As an authorised Georg Fischer distributor, BigWeld supplies the type 519 to meet stringent technical standards in installations requiring long-term hydrostatic integrity and consistent fluid dynamics over an operational lifespan of up to 25 years.

Constructed from isotactic beta-polypropylene homopolymer (PP-H), the valve body delivers outstanding chemical resistance against aggressive media alongside high mechanical strength. The upper body bonnet is manufactured from glass-fibre reinforced polypropylene (PPGF), ensuring rigidity and resistance to external degradation. The valve incorporates elongated spigots designed for seamless integration using conventional butt fusion and infrared (IR) welding methods. Operating at a nominal pressure rating of PN10 (SDR11) at 20 degrees C, it maintains reliable containment across metric sizes from d20 mm to d63 mm (DN15 to DN50).

Engineered with an optimised internal geometry, the type 519 delivers up to double the flow rate of legacy models, reducing pressure drop across the system. Maintenance is streamlined by a central housing union nut that replaces traditional external metal screws, eliminating fastener corrosion and simplifying diaphragm servicing. Manual actuation is governed by a lockable handwheel with an integrated two-colour visual position indicator. High-integrity sealing is achieved through resilient EPDM or PTFE/EPDM diaphragms, ensuring hermetic shut-off and reliable operational safety.