Type 578 Lug Style Butterfly Valve


The 578 Butterfly valve from Georg Fischer has all the innovative designs aspects our butterfly valve line is known for but now available in a lug style body. The new valve is ideal when end of line service is required. With the double eccentric valve principal, variety of wetted materials, and a comprehensive actuation package, it is the most versatile plastic butterfly valve on the market.

The Double Eccentric Operating Principal

Unlike most traditional valves, our valve does not use a thick rubber boot for the disc and flange seal. The 578 valve has an off center disc and shaft that disengages the disc from the body during operation. Since the disc is not in contact with the disc seal when opening and closing, there is significantly less wear on the valve parts.

Another result of the double eccentric design is reduced torque. Over time, traditional boot style valves have a tendency to become harder to operate which is troublesome for maintenance and operation personnel. The increased torque can also cause electric actuators to fail prematurely. Even when comparing new valves, our design requires approximately 50% less torque.

Product Overview

Technical Data:

Size Range:

Type 578:

  • 2" - 12": PVC, CPVC, ABS, PP-H, PVDF

Pressure Rating:

  • PN10 (up to 150 PSI), Bi-directional

Standard Ratings:

  • Lug ANSI


  • Polyvinyl Chloride (PVC)
  • Chlorinated Polyvinyl Chloride (CPVC)
  • Acrylonitrile-Butadiene-Styrene (ABS)
  • Polypropylene PP
  • Polyvinylidene Fluoride (PVDF)


  • EPDM, FPM, and others on request

Fields of Application:

  • Water treatment
  • Power plants
  • Marine
  • Electroplating
  • Chemical process industry
  • Automotive industry
  • Cooling equipment
  • Aquariums
  • Swimming pool construction


  • 50% lower actuation torque compared to a centric butterfly due to the double eccentric operating principle
  • Abrasion can be reduced noticeably
  • Integrated electric position indicator in the mounting flange
  • Optimized gaskets
  • All components which are in contact with the media are made of piping materials, minimizing permeation
  • Functional hand lever made of glass-fiber-reinforced polypropylene (PP-GF 30) with 5° ratchet setting, lockable




  • Manual valves with hand lever or reduction gear
  • Pneumatically or electrically actuated
  • Handle extension
  • Fine adjustment lever allows disc to be opened at any angle from 0o to 90o
  • Increased chemical resistance and a wider temperature range with a PVDF liner and a PTFE disc seal

Video - Type 578 Lug Style Butterfly Valve