SYGEF Standard Diaphragm valve DIASTAR Ten FC PVDF

  Datasheet (PDF)

Georg Fischer SYGEF Standard DIASTAR Ten FC diaphragm valve is a pneumatically actuated industrial process valve engineered for precise shut-off, throttling, and isolation of high-purity fluids and aggressive chemical media across pipe sizes d20 to d63 mm (DN15 to DN50). Operating on a fail-safe-to-close (FC) pneumatic mechanism, the internal spring assembly automatically returns the diaphragm to a fully sealed position upon pilot air depletion, ensuring dependable process safety in critical utility systems. The valve body is injection-moulded from unpigmented polyvinylidene fluoride (PVDF), exhibiting high chemical resistance to strong acids, oxidizers, and halogens across an operating temperature range of -20 degrees C to 140 degrees C, complemented by a smooth internal surface finish of Ra ≤ 0.5 µm to eliminate dead legs and reduce biofilm accumulation. The mechanical architecture incorporates a single central housing nut instead of the traditional four-bolt bonnet connection, distributing uniform circumferential clamping force over the diaphragm seal, preventing localized mechanical distortion and accelerating maintenance downtime. Its flow-optimized internal geometry delivers up to double the flow rate compared to earlier valve generations, effectively reducing line turbulence and system pressure drop. The pneumatic actuator housing incorporates a flexible pilot air supply port capable of rotating at 90-degree intervals, facilitating clean tubing layout in congested installations. Configured with metric butt fusion spigots compatible with conventional butt fusion, IR Plus infrared welding, and BCF Plus bead-and-crevice-free jointing, the valve integrates into pharmaceutical purified water (PW), deionized (DI) water loops, and chemical distribution lines validated for hot water, steam, and ozone sanitization.