A Rubber Seated Flapper Check Valve (also known as a Resilient Seated Swing Check Valve) is a high-performance non-return valve designed for water, wastewater, and sewage applications. Its defining feature is a flexible, rubber-encapsulated "flapper" or disc that is hinged at the top of the valve body.
Unlike traditional metal-seated valves, the flapper in this design provides a soft, "bubble-tight" seal, making it highly effective for preventing backflow in systems containing small solids or debris.
Design & OperationThe valve consists of a simple, robust body with a single moving part: the Resilient Flapper.The Flapper: Typically made of a steel or ductile iron core that is fully vulcanized with high-grade rubber (EPDM or NBR).Angle Seat Design: Many models feature a 35° - to 45° angled seat, which reduces the travel distance of the flapper. This allows for faster closing and significantly reduces the risk of "slamming" or water hammer.Unobstructed Flow: When open, the flapper swings completely out of the flow stream, providing a full-bore path that allows solids to pass without snagging.
Technical Attributes
1,Design Standard,AWWA C508 / EN 16767 / MSS SP-71
2,Size Range,"DN50 to DN1200 (2"" to 48"")"
3,Body Material,Ductile Iron (GGG50 / ASTM A536)
4,Pressure Class,PN10 / PN16 / Class 125 / Class 150
5,Sealing Type,Resilient Seated (Zero Leakage)
6,Disc (Flapper),Ductile Iron core fully encapsulated in Rubber
7,Rubber Material,EPDM (Water) / NBR (Sewage/Oil)
8,Seat Angle,35∘ or 45∘ (Quick-close design)
9,Face-to-Face Dim.,ASME B16.10 / EN 558 Series 10 / Series 48
10,Bore Design,Full Bore (Unobstructed straight-through)
11,Hinge Mechanism,Integrated flexible hinge (No pins/bushings)
12,Coating,"Fusion Bonded Epoxy (FBE), Blue RAL 5005"
13,Coating Thickness,≥ 250 Microns
14,Bonnet Gasket,EPDM / NBR O-ring
15,Bolting Material,Stainless Steel AISI 304 / 316
16,Flange Standard,EN 1092-2 / ASME B16.1
17,Test Standard,EN 12266-1 / API 598
18,Mounting Position,Horizontal or Vertical (Flow upward)
19,Shell Test Pressure,"1.5×PN (e.g., 24 Bar for PN16)"
20,Seat Test Pressure,"1.1×PN (e.g., 17.6 Bar for PN16)"
21,Working Temp.,−10°C to +80°C
Contact: Jorge Yang
Phone: +86-13588258503
E-mail: sales@fluvalve.com
Whatsapp:+86-13588258503
Add: Room 331, South Building,Building 1, No.3 Jinpeng Street, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province
