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DRAINAGE (TIDE)(FLAP) GATES
F-25 Medium Duty Drainage Gate
- Cast Iron Construction
- Automatic Operation
- Fully Adjustable Hinge Links
- 25 Foot Seating Head Maximum
The Waterman Model F-25 Drainage Gate features a high strength, fully
adjustable linkage, providing for sensitive adjustment of the flap cover
after installation. The design of this gate prevents jamming and assures
proper seating through the use of built-in safety stops and a 2 1/2"
to 5" seating angle. Flatback and Spigotback models are available.
A choice of seat facings is available and includes machined or ground
iron, bronze or neoprene cover gasket which is available with either iron
or bronze mating frame seats. The use of the Waterman neoprene cover seal
provides a long life tight seal, which can be easily renewed. The heavy
seal also provides a moderate cushioning of shock loads where some slamming
may occur. This model is not recommended for pump discharges where violent
slamming can occur. • Cast Iron Frame and Cover • High Strength
Ductile Iron or Steel Links • Stainless Steel Studs, Bolts and Pins,
Standard. Brass or Monel, Optional. • Bronze Bushings, Standard.
Permanently Lubricated Bronze or Teflon, Optional. • Minimum 2 1/2"
Seating Angle. 24" Diameter and over. • Minimum 5" Seating
Angle. 21" Diameter and smaller. • Optional 25 lb. and 125 lb.
ANSI Flange Drilling. CAST IRON SEAT - Standard. Used for moderate conditions
where costs must be minimized. BRASS SEAT - Optional. Used for corrosive
conditions where long service is important. NEOPRENE SEAT (with iron or
bronze) - Optional. Replaceable in flap cover. Cushions "slam"
on closing and provides tighter seal.
General
The drainage gate shall be designed to allow free outflow and prevent
backflow for maximum seating heads up to 25 feet. Gates shall be Waterman
Model F-25 or equal.
Construction
The frame shall be cast iron of flatback or spigotback design, with machined
seating surface inclined from vertical at minimum of 2 1/2", to assure
positive closure. For flatback gates mounted to thimbles or flanges, the
gate flange shall be machined and drilled to match. The cover shall be
cast iron, cast in one piece, with reinforcing ribs, designed to withstand
the seating head specified. An integral cast on lifting eye shall be provided
for manual operation. Seating surfaces for frame and cover shall be: (bronze
on seat and cover) (machined iron on frame, neoprene on cover) (bronze
on frame, neoprene on cover) All machined seats shall have a minimum 63
microinch finish. The gate shall be provided with adjustable, double pivoted
hinge links so designed to permit complete seating, full opening, and
with stops or other arrangement to prevent cover from rotating sufficiently
to become wedged in the open position. Pivot lugs mounted to frame shall
be adjustable to allow adjustment of hinge links without having to remove
cover from gate. The hinge links shall be bronze-bushed, structural steel
(or high strength ductile iron, cast manganese bronze, or wrought stainless
steel). All assembly hardware shall be type 18-8 stainless steel.
Finish
All cast iron shall be painted with manufacturer's standard shopcoat paint
(or special paint). Structural steel hinge links shall be galvanized.
All bronze and stainless steel parts do not require further finish.
Materials
Frame and Cover - Cast Iron per ASTM A-126, Class B. Pivot Lug - Ductile
Iron per ASTM A-536, Gr. 65-45-12. Hinge Link - Structural Steel per ASTM
A-36, galvanized per ASTM A-123. Bronze Bushings and Washers - Commercial
Bronze. Assembly Hardware and Pins - 18-8 Stainless Steel (Type 304).
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