The ET VALVE U-Type Backrest-Seated Butterfly Valve is a high-performance flow control valve designed for heavy-duty industrial piping systems. It operates by rotating an internal disc in conjunction with a U-section seat seal to open, close, or regulate fluid flow. A 90-degree turn enables quick opening and closing with rapid response. When fully open, the disc offers minimal resistance to fluid flow, ensuring superior energy efficiency.Its U-shaped valve body design facilitates centering and installation between flanges, making it an ideal alternative to standard wafer-style or lug-style butterfly valves.This valve is specifically designed to achieve bidirectional zero-leakage sealing, consistently maintaining reliable shut-off performance.