F-55 Heavy Duty Flap Gates

WATERMAN F-55 HEAVY DUTY FLAP GATES are designed for applications with maximum 55 foot seating heads.  Each gate is custom-made to job requirements.

Key Features:

  • Sizes 4″ to 108″ diameter
  • Automatic operation
  • Cast iron frame and cover
  • Machined seating surfaces for tight closure
  • 2.5 degree seating angle
  • Field-adjustable linkage allows sensitivity adjustment
  • Lifting eye in cover for manual operation for maintenance
  • Standard bronze hinge bushings; stainless steel hinge pins, studs and nuts
  • Flatback or spigotback (125# ANSI standard) frame
  • A leaf-spring bumper with rubber cushion block can be furnished and should be used with pump discharge lines


  • Ni-resist cover, frame and hinge block
  • Iron, bronze (red brass) or neoprene seats.  Use of neoprene provides long life tight seal
  • Non-metallic hinge bushings
  • Manganese bronze hinge links
  • Permanently lubricated bronze bushings
  • Custom coatings including epoxy, coal tar or total galvanizing