Eccentric Butterfly Valves

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Sierra Engineering & Manufacturing

Cairo, Egypt

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SIERRA model 7500 is an eccentric disc seated – double eccentric – butterfly valves. The valve body and discs are designed to provide minimal flow resistance. Precise tightness is ensured on both sides. The double eccentric effect enables the rubber sealing ring to separate easily from the body seat, resulting in a cam-like motion to lift the seat from the seal during the first degree of opening, thereby reducing the opening resistance, and wear and improving the service life of the valve seat. The sealing ring can be easily changed in the pipeline without disassembling the disc. 7500 BFV model is suitable for high-pressure waterworks applications, it is an excellent valve for isolation purposes, and it might also be used for throttling purposes under certain conditions

                                                            Product Range
                                                            DN100 – DN2600
                                                        
                                                            Pressure Rating
                                                            PN10, PN16 and 25
                                                        
                                                            Temperature Range
                                                            -20°C TO +70°C
                                                        
                                                            Flange Dimensions
                                                            EN1092-2 (DIN2501)
                                                        
                                                            Hydrostatic Testing
                                                            EN12266, ISO5208
                                                        
                                                            Type Testing
                                                            EN1074-1&2
                                                        
                                                            Actuation
                                                            Manual with GB, and/or electrically actuated
                                                        
                                                            Certificates
                                                            Manufactured under a certified ISO 9001 quality system

Municipal water and irrigation pipeline mains and distribution networks
Pumping stations and intakes
Ground reservoirs and elevated tanks
Water treatment plants
Primary and secondary cooling for power stations

Main Product Features

The Double Eccentric Design Prevents High Friction Between The Disc Rubber Seal And Body Seat During The First Few Degrees Of Opening And Closing Of The Valve. The Double Eccentric Design Hence Prolongs The Life Of The Rubber Seal.
The stainless steel seat design is welded and precisely machined inside the valve body hence: Providing a lower coefficient of friction during operation, high corrosion, and wear resistance
Rubber seal & retainer mechanism (pressure-activated rubber seal molded in one piece -no glued joint- is mechanically attached to a highly secured retainer sealing mechanism
Tight closure in both directions at valve rating pressures
Optimized disc design which provides minimal flow resistance
Compact design which requires a small space
Flexible design allowing maintenance and replacement of disc seal in-line