Models: 71, 71U Cast Iron SURE CHECK Valves Sizes: 2"– 54" (50 – 1350mm) TM Pressure/Temperature –Non-Shock Model Material Rating * atings are for Model 71 only. R See limitations for UL model 71U, sizes 4” - 12” Typical Service • esigned for liquids and gases where flow reversal can cause surge and water hammer. D • lastomer seats provide bubble-tight shutoff. E Features • ompact design with short face-to-face dimensions for minimum space requirements. C • ual shaft design allows interchangeability of shafts. D • orsion springs close the valve prior to flow reversal. T • orsion springs exert a lifting motion on the discs, enabling the center “heel” to open first. T This prevents excessive wear of the seat in this area, and provides a consistent wear pattern and long sealing capability. D • ownstream stop shaft stabilizes the discs at high flow rates and prevents them from striking each other, which can cause premature wear, stress on the shaft, and chattering. Construction • obust cast body is wafer style, featuring compact face-to-face dimensions. R • esigned to fit within ANSI bolt circles. D • ariety of trim and seat materials are available V Installation • an be installed horizontally or vertically. C – Consult factory for downward vertical flow applications. – In horizontal applications, shaft should be in vertical orientation. • ood piping practice recommends installing a distance of 5 to 10 pipe diameters from elbows, G pumps, or others turbulence-creating devices. • ueller Steam Specialty strongly recommends the installation of a strainer ahead of the M pump to ensure protection of both the pump and the valve from foreign particles. • pplicable ASTM, ANSI, and API standards A • M Approved F – Model 71, sizes 2” – 16” - Domestic Only • L Listed / ULC Listed U – Model 71U, sizes 4”, 6”, 8”, 10”, and 12”

Body: Disc: Shaft/spring: Seat: Cast Iron ASTM A126-B Bronze ASTM B62 316 SS Buna-N ASTM A126-B Bronze ASTM B62 316 SS Buna-N See SURE CHECK™ Valve information section of the Mueller Steam Specialty binder for alternate materials and How To Order options UL Model 71U Only – Presure 175 CWP Mueller Steam Specialty product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Mueller Steam Specialty Technical Service. Mueller Steam Specialty reserves the right to change or modify product design, construction,...