Keystone Series GR Butterfly Valve

Wafer and lugged body design with face-to-face dimension, according to EN 558 Series 20 and API 609.;Designed according to EN 593 and API 609.;The seat is field replaceable and fully isolates the body and shaft from the flow.;Primary shaft sealing exceeds the pressure rating of the valve and prevents leakage through shaft area to atmosphere.;A secondary shaft sealing provides back-up safety.;A molded-in O-ring in the seat for flange sealing eliminates the need for gaskets.;Shaft seals prevent moisture penetrating into the shaft area.;The two piece shaft allows for a thin disc and provides minimal obstruction to flow (up to DN 300/ NPS 12).;Rounded polished disc edge gives full concentric sealing, lower torques, longer seat life and drop-tight shut-off.;Body locating holes allow ease of installation and centering between the flanges.;Extended body neck allows for pipe insulation.;Top and bottom shaft bearings for optimized support and minimum friction and decreased torque.