Swing Flex Check Valves
Sierra Model 5600 is a robust swing flex check valve, commonly used in sewage, wastewater, raw water, and drinking water applications. It has one moving part which is the flapper that does not pivot in a hinge pin, rather it flexes to open. This check valve has non-slamming characteristics because the flapper only travels 35° to reach the seat. Since the flapper is loaded (due to resiliency) it usually closes before flow reversal, so it prevents slam and water hammer.
Design Features
- Non-clog design: unrestricted flow area combined with smooth streamlined contouring allows passage of large solids and minimizing the potential for clogging.
- Reinforced disc: One-piece (fully encapsulated disc) precision molded disc is steel, and nylon reinforced to provide years of trouble-free performance.
- One moving part: Memory-flex disc is the only moving part, assuring long life with minimal maintenance. no packing, mechanical hinges, pivot pins or bearings to wear out.
- Drop tight seating: The synthetic reinforced disc, with its integral O-ring type seal design assures positive seating at high and low pressures
- Non-slam closure: Short disc stroke combined with memory-flex disc action reduces potentially destructive water hammer.
- Backflow actuator: Body is drilled and tapped for installation of optional backflow actuator, available for use when manual backflow operation is required. most commonly used for priming pumps, back flushing, draining lines and system testing.
- Flex action: The resiliency of disc with its integral O-ring type seal design assures drop tight seating at both high and low working pressures
Material Standards
1. Body —— Ductile Iron EN-GJS-500/7 Or Ductile Iron EN-GJS-400/12
2. Cover —— Ductile Iron EN-GJS-500/7 Or Ductile Iron EN-GJS-400/12
3. Disc —— Buna-N (Steel & nylon reinforced)
4. Cover Seal —— NBR Rubber
5. Bolts and Washers —— Galvanized steel grade 8.8
6. Lifting Eye —— Galvanized steel grade 8.8