Top: model PF-25 F Bottom: model PF-25 W

To view PDF's download Adobe Acrobat PF-25 PDF

DRAINAGE (TIDE)(FLAP) GATES
PF-25 Cast Iron Flap Valves - Drainage

Flange Style

Model PF-25F Waterman Model PF-25 flap valves are designed for use on pump discharge lines and other pipe end closures to prevent entrance of back water. These valves are furnished with a variety of frame styles to fit most installation needs. A 7 1/2" inclined seating plane is used to ensure that the valve will not "hang open" from slight pipe sagging or off grade. A positive stop prevents over opening. The flange model (PF-25F) may be furnished with either iron or bronze seat faces. Bronze hinge pins are standard. Drilling is ANSI 125 lb. standard.

• Cast Iron Body • Flange or Compression Mounted • Cast Iron Cover • Aluminum Cover Optional • Cast Iron, Bronze or Resilient Seat Faces • Bronze Hinge Pins • 7 1/2º Seating Plane

Compression Style

The popular compression model (PF-25W) uses time proven wedge type seals to install quickly and easily on plain end standard steel pipe. A special gasket is furnished for use with O.D. sized steel pipe. This model is standard with a cast iron frame with machined seat face and a cast iron cover with a resilient neoprene rubber seat face. Follow ring is cast iron with rubber wedge gasket and plated steel draw bolts. Valves are available with aluminum covers and neoprene seat faces where extra sensitivity is desired. Taper setting collars can be provided as an aid for installation on concrete pipe.

General

The Flap Gate shall be designed to allow free outflow and prevent backflow for maximum seating heads up to 25 feet. Flap Gates shall be Waterman Model PF-25 or Equal.

Construction

The frame shall be of cast Iron (ASTM A-126 Class B) and shall be the flangeback or compression type, as indicated on the plans. The seating face shall be inclined from vertical at an angle of 7½º to assure a positive closure. For flangeback gates that are to be mounted on flanges or on thimbles, the frame shall be drilled to match. For compression type frames, a cast iron follow ring with neoprene pipe seal gasket will be included along with plated steel draw bolts to effect a tight seal between the gate and pipe. The cover shall be cast iron (ASTM A-126 Class B) or cast aluminum ( ASTM B-26) and shall be domed to withstand the seating head specified. An integral cast lifting eye shall be included for manual operation. The seating surfaces on the frame and cover shall be: Bronze on frame and neoprene in cover or machined iron on frame and neoprene on cover. All machined seats shall have a minimum 63 microinch finish. The hinge links shall be cast as one piece with the cover and shall be attached to the frame by means of a bronze hinge pin. A positive stop shall be included to prevent over-opening of the cover.

Finish

All cast iron shall be painted with manufacturers standard shopcoat paint (or paint as specified). All other parts will not require any further finish.