Slim design, minimum space required, easy for installation. One piece design with precise dimension and accurate position, large flowrate and low resistance. KV-68 Butterfly Valve Mechanical polishing surface, provide smooth surface with great finishing, assure the disc closes tightly with zero leakage. PTFE or other coating material is available for disc ·Dry bushings on both end of the shaft，self-lubricated, heavy duty, provides excellent support for shaft, maintenance free with long service life. KV-88 valve seat is PTFE lined with EPDM, excellent corrosion resistance and heat resistance. ·KV-98 valve seat is PTFE lined. It provides excellent corrosion resistance and heat resistantce. On behind of the PTFE lining which is silicone or fluorine rubber The seat is replaceable and easy for maintenance