DFFV
DUAL FREE FLOW VALVE
DUAL'S Free Flow Valve operates on the discharge side of the pump. As the flow through the pipeline starts or stops, the ball automatically rises or falls, opening or closing the valve. This occurs without noticeable shock or hammer, regardless of the line pressure or the speed of closure.
FEATURES
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Long ball life due to ball rotation.
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Long seat life, Seats are out of the flow and can be rotated in line to increase seat life fourfold.
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Easy maintenance. Seat and ball can be inspected or replaced without removing the free flow from the pipeline.
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Virtually maintenance free because of the simple design.
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Rotating and floating ball - self adjusts to flow.
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Self cleaning due to the freely rotating ball.
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Full port opening. No obstruction to the flow.
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Virtually no pressure drop. Eliminates pipe hammer.
APPLICATIONS
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Mining and mineral processing.
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Power generation.
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Sand and gravel.
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Chemical and soda ash.
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Pulp and paper.
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Environmental and effluent.
SPECIFICATIONS
Size Range
80mm to 600mm.
Operating Temperatures
Operating temperatures to 80 ˚C. Higher conditions are possible if the valve is constructed from suitable materials.
Valve Housing
Valve housing is constructed of high quality Carbon Steel. Stainless Steel is an option.
Pressure Rating
Working pressure standards are 16, 25, 40, 80 and 100 Bar.
Lining
Valve housing can be Natural Rubber lined. A range of elastomer grades are available for corrosive duties (Urethane or Ceramic).
Ball
hollow Carbon Steel and is Urethane coated. Other elastomers are also available (Stainless Steel for high pressure).
Valve seat
The seat is made in Abrasive Resistant AR Steel (500 Brinnell hardness), Urethane or Stainless Steel and is replaceable.
Drilling Patterns
Flanges comply with AS, ANSI, DIN, SABS or BS.