Model: 77 Carbon Steel or Stainless Steel SURE CHECK Valves, Class 900 Sizes: 2"–12"(50 – 300mm) TM Pressure/Temperature –Non-Shock Model Material Rating 77D Carbon Steel * eat and/or Spring Materials may limit S temperature. Typical Service • esigned for liquids and gases where flow reversal can cause surge and water hammer. D 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. • ownstream stop shaft stabilizes the discs at high flow rates and prevents them from striking D 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 • igh pressure elastomer seats are available for sizes 4" and up. H Installation • an be installed horizontally or vertically. C – Consult factory for downward vertical flow applications. – In horizontal applications, shaft should be in vertical orientation. Model 77 G • ood piping practice recommends installing a distance of 5 to 10 pipe diameters from elbows, 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. • onsult factory for applications such as pump suction and volatile liquids. C Special Coatings or Treatments • or Stainless Steel, pickling and passivation available on request, consult factory F Approvals/Specifications • pplicable ASTM, ANSI, and API standards A

Body Disc Shaft/spring Seat Carbon Steel ASTM A216 Gr. WCB Carbon Steel ASTM A216 Gr. WCB 316 SS Metal to Metal Stainless Steel ASTM A351 Gr. CF8M Stainless Steel ASTM A351 Gr. CF8M 316 SS Metal to Metal See SURE CHECK™ Valves section of the Mueller Steam Specialty Engineering binder for alternate materials and How to Order options. Larger Sizes On Application 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...