OEM Wafer Butterfly Valve Vs Lug Butterfly Valve Factories & Exporters

A wafer valve is structurally secured by long through-studs compressed between two companion flanges. If the downstream piping or flange is detached for maintenance or pump replacement, the compression holding the valve seat against the disc is completely lost. The pipeline pressure on the upstream side will push the disc and elastomer outward, leading to disastrous failure and line flooding. In contrast, lug butterfly valves bolt independently to each flange, securely holding the media under full working pressure without downstream retention.

Yes. Premium OEM factories engineer "multi-standard" wafer bodies with slotted centering alignment holes designed to accurately center the valve body between ANSI Class 125/150, DIN PN10/PN16, and JIS 10K/16K flanges. However, for lug-type valves, bolt holes must be precision-tapped according to specific thread standards (e.g., UNC threads for North American ANSI or Metric coarse threads for ISO/DIN standards).

Wafer valves feature a lower initial purchase price (typically 20% to 35% cheaper due to reduced casting weight) and cheaper shipping costs. However, in complex processing plants that require scheduled maintenance or clean-in-place operations, a lug valve eliminates the need to shut down and drain the entire distribution loop during component servicing, saving extensive engineering labor hours and preventing plant downtime.

Wafer installations use continuous threaded rods spanning across the body. In elevated temperature installations, the thermal expansion rate of the long studs exceeds that of the compact valve body casting, which can lead to stud relaxation, diminished flange gasket load, and fugitive external leakage. Lug valves utilize short independent flange bolts, which drastically reduces thermal growth mismatch and ensures leak-free perimeter torque.