Diaphragm valve Type 604 PVC-U d20 6 bar

  Datasheet.pdf

The Georg Fischer Type 604 diaphragm valve in PVC-U is a pneumatically actuated process valve for automated control and tight shut-off of neutral and aggressive liquids. This version is supplied with d20 solvent cement connections and is rated at 6 bar at 20 degrees Celsius. The body is all-plastic and assembled without external metal screws, so nothing on the valve exterior can corrode in a chemically loaded atmosphere, while the compact envelope suits densely packed skids and dosing panels.

Unplasticised polyvinyl chloride gives high chemical resistance to inorganic acids, alkalis and saline solutions, so the Type 604 is specified in water treatment, chemical distribution and precision dosing installations. All moving parts sit behind the flexible diaphragm, hermetically separated from the medium, so the actuator never comes into contact with the fluid. BigWeld is an authorised Georg Fischer distributor and supplies genuine piping automation components across Europe.

The internal flow geometry is optimised for a high flow rate with minimal pressure loss across the seat. The pneumatic actuator uses a threaded housing rather than a bolted cover: it opens for inspection or diaphragm replacement without special tools, and the stroke is fine-tuned with a standard flat screwdriver to set exact flow limits and throttling behaviour on the installed assembly. The short stroke and small actuator volume give fast opening and closing times for rapid-cycling dosing loops, automatic rinse sequences and safety shut-off duties.

Installation length follows common market dimensions, so the valve integrates into existing metric PVC-U lines and OEM machine frames without re-piping. The ends are joined by solvent cementing with the matching cement and cleaner, and the 6 bar rating applies at 20 degrees Celsius, with de-rating at higher medium temperatures. Thread pastes that attack PVC-U must be avoided on adjacent threaded adaptors.