Lined butterfly valve are designed to meet the demanding requirements of the general utility valve market with the HVAC segment in particular. IVGKL is a truly fit & forget valve, which requires minimal maintenance. The body liner which also functions as the soft seat, comes in an integrally molded (bonded) version and offers 100% bi-directional sealing against vacuum to rated pressures of PN10.The wafer style body has universal design to fit between pipe flanges of almost all popular flange standards.