Type 568 lug-style butterfly valve

The Type 568 lug-style butterfly valve has shaft seals that incorporate a double O-ring to protect against external leakage. A disc seal replaces the traditional rubber liner to allow the disc to completely disengage from the seal upon valve opening, reducing friction and improving wear capabilities. The disc seal also incorporates a cross-sectional profile that mechanically retains the seal in the valve body. And a specially engineered body seal features a Q-shaped O-ring that eliminates the need for flat gaskets. The valve has a modular design with an epoxy-coated iron lug body. The wetted inner body, disc and bearings are available in PVC, chlorinated PVC (CPVC), polyvinylidene fluoride (PVDF) or polypropylene (PP) to match the outer pipe material, providing excellent chemical compatibility throughout the system. With a pressure rating of 150 psi, the valve can withstand operating temperatures up to 120°C (PVDF), 80°C (PP and CPVC) or 60°C (PVC). Designed for dead-end service, the valve enables a piping system to be capped off, yet allows future modification or expansion of the pipeline without depressurizing the system.