Lug butterfly valve Type 578 PVC-C metric PN10

  Datasheet (PDF)

The Georg Fischer Type 578 lug butterfly valve pairs a PVC-C disc with a glass-fibre reinforced polypropylene housing and stainless steel threaded lug inserts. Available from d63 to d315 mm with EPDM or FKM seals, it delivers bi-directional PN10 isolation and accurate throttling in metric process lines carrying aggressive acids, alkalis and saline solutions at elevated temperature.

Technical specifications

The valve offers bi-directional bubble-tight shut-off at working pressures up to PN10 at 20 degrees Celsius. Its double-eccentric disc reduces operating torque and limits friction against the elastomeric seat, extending service life under continuous throttling duty.

• Nominal pressure: PN10 (10 bar) at 20 degrees Celsius across all sizes
• Operating temperature: up to 80 degrees Celsius, subject to pressure derating
• Sealing: high-purity double profile gaskets in EPDM or FKM
• Actuator interface: DIN EN ISO 5211 top flange for manual or automated operation
• Flange compatibility: metric EN 1092-1 PN10 and ISO 7005 PN10 bolt patterns
• Lug body: full bi-directional end-of-line service at system working pressure

Materials and standards

The disc is manufactured in PVC-C, the outer housing in glass-fibre reinforced polypropylene (PP-GF30) and the lug inserts in stainless steel 1.4404 / 316L, so every wetted component resists degradation by strong mineral acids, caustic alkalis and salt solutions.

Dimensional and interface standards followed by the valve are EN 1092-1 PN10 and ISO 7005 PN10 for the bolt pattern and DIN EN ISO 5211 for the actuator mounting, which keeps the valve interchangeable within the Georg Fischer PVC-C industrial piping system and its modular actuation range.

Installation and jointing

Because the threaded inserts are integrated directly into the housing, the valve can be bolted between metric backing flanges or installed as an end-of-line isolation point. Downstream pipework and equipment can then be dismantled for maintenance without draining the upstream section of the system.

The ISO 5211 top flange accepts hand levers, manual reduction gearboxes and pneumatic or electric actuators, so the valve can be retrofitted or automated later without altering the installed body. Seal material should be selected according to the medium: EPDM as the standard industrial elastomer, FKM where higher acid and chemical resistance is required.