Valves & Gates: Flap Gates

Neenah Foundry offers a variety of cast iron flap gates. Use the drop down menu below to find the flap gates that fit your needs.

R-5004 Series+

R-5004 Series

Flanged Flap Valve

Flap valves are used in areas where water accumulates, such as manholes or concrete boxes. When the manhole begins to fill, the flap valve can be opened to fluish the area of water. The flap valve door has a tab with a hole located in the center to allow a handle to be attached so it can be opened from the surface.

Furnished standard with neoprene seat mounts. Bronze seat mounting is available on special order. All hinge pins are brass. Flanges are faced and drilled to 125 pound standard.

R-5004 Series Flanged Flap Valve

Catalog Number Inside Diameter Laying Length
R-5004-A1 4 4
R-5004-A2 6 4
R-5004-A3 8 7-1/2
R-5004-A4 10 5-1/2
R-5004-A5 12 8

R-5040 Series+

R-5040 Series

Flap and Flush Valve Frame, Lid

Shown are some standard types of flap and flush valves. Flanged ends are faced and drilled to 125 pound standard.

Flap valves are used in areas where water accumulates, such as manholes or concrete boxes. When the manhole begins to fill, the flap valve can be opened to fluish the area of water. The flap valve door has a tab with a hole located in the center to allow a handle to be attached so it can be opened from the surface.

Valved furnished with solid brass hinge pins; neoprene or bronze available on special order at extra cost. Chain furnished only when specified.

R-5040 Series Flap and Flush Valve Frame, Lid

Catalog Number Inside Diameter Laying Length
R-5040-F1 4 4
R-5040-F3 6 4-1/2
R-5040-F4 8 7-1/2
R-5040-F5 10 5-1/2
R-5040-F6 12 8
R-5040-F8 * 15 14
* Flange bolt circle for standard 16" class 125# pipe.

R-5050 Series+

R-5050 Series

Automatic Drainage Gate

Automatic drainage gates are used in areas with a requirement to prevent back flow, such as storm and sanitary sewer systems.

STANDARD GATES: Furnished with vertical closure for maximum ease of operation.

GENERAL INFORMATION: Gates are made of cast iron. All moving parts operate on stainless steel hinge pins. The cover is hung with cast iron arms (Ductile Iron arms on larger sizes) located at the outer edges near the center of gravity to ensure sensitive operation. For improved seating, order with neoprene seat at extra cost.

Aluminum covers can be furnished for special requirements, if specified. Also available on special order and at extra cost are neoprene or solid bronze seat mounts and bronze bushed hinges.

For applications with extreme head pressure contact Neenah’s Product Engineering Department.

Maximum head loss occurs when pipe is flowing full. Consider the head loss to be one-half the pipe diameter.

These flap gates are self-draining when no up-stream flow exists and no head is on the downstream side.

R-5050 Automatic Drainage Gate

Catalog No. Type SF Catalog No. Type CF Catalog No. Type FF Diameter A B C D E F N S
R-5050-SF6 R-5050-CF6 R-5050-FF6 6 7 11 13 11 3/4 7 Four 5/8
R-5050-SF8 R-5050-CF8 R-5050-FF8 8 9-1/4 11 13 11 1-1/8 9-1/4 Four 5/8
R-5050-SF10 R-5050-CF10 R-5050-FF10 10 11-1/4 13-1/2 15-1/5 13-1/2 1-1/8 11-1/4 Four 5/8
R-5050-SF12 R-5050-CF12 R-5050-FF12 12 13-1/4 15-7/8 18 15-3/4 1-1/8 13-1/4 Four 5/8
R-5050-SF15 R-5050-CF15 15 16-1/4 19 21 18-3/4 1-1/8 16-1/4 Four 5/8
R-5050-SF18 R-5050-CF18 R-5050-FF18 18 19-1/4 22-1/8 24-1/4 22-1/8 1-1/4 19-1/4 Four 3/4
R-5050-SF20 R-5050-CF20 R-5050-FF20 20 22-1/4 25-1/8 27-1/4 25-1/8 1-1/4 22-1/4 Four 3/4
R-5050-SF21 R-5050-CF21 21 22-1/4 25-1/8 27-1/4 25-1/8 1-1/4 22-1/4 Four 3/4
R-5050-SF24 R-5050-CF24 R-5050-FF24 24 25-1/4 28-1/4 30-1/4 28-1/4 1-1/4 25-1/4 Six 3/4
R-5050-SF27 27 28-1/4 31-1/4 33-1/4 31-1/4 1-1/4 28-1/4 Six 7/8
R-5050-SF30 R-5050-CF30 30 31-1/4 34-1/4 36-1/2 34-1/4 1-1/4 31-1/4 Six 7/8
R-5050-SF36 R-5050-CF36 36 37-1/2 41-1/2 43-1/2 41-1/2 1-3/8 37-1/2 Six 7/8
R-5050-SF42 R-5050-CF42 42 43-1/2 47-1/2 49-1/2 47-1/2 1-3/8 43-1/2 Six 7/8
R-5050-SF48 R-5050-CF48 48 49-1/2 54 56-1/2 54 1-1/2 49-1/2 Six 1

R-5050 Automatic Drainage Gate

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