‘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 and closing the valve. This occurs without
noticeable shock or hammer, regardless of the line
pressure or the speed of closure

  • Valve housing is constructed of high quality carbon
    steel. Stainless steel is an option.
  • Valve housing can be natural rubber lined. A range
    of elastomer grades is available for corrosive
    duties (URETHANE or Ceramic).
  • Ball is made of hollow carbon steel and is urethane
    coated. Other elastomers are also available
    (Stainless Steel for high pressure).
  • The seat is made in Abrasion Resistant
    AR steel (500 Brinnell hardness), URETHANE or
    Stainless Steel and is replaceable.
  • Flanges are typically made in carbon or stainless
    steel and drilled to customer requirements. For
    Europe, flanges are made to DIN.
  • Working Pressure Standards are 16, 25, 40, 80
    and 100 Bar.
  • Operating temperature to 80°C. Higher conditions
    are possible if the valve is constructed from suitable
    material.
  • The Free Flow Valve can work in the horizontal and vertical position.

  • Rotating and floating ball - self adjusts to flow.
  • Self cleaning due to the freely rotating ball.
  • Long ball life due to ball rotation.
  • Full port opening. No obstruction to the flow.
  • Virtually no pressure drop. Eliminates pipe hammer.
  • Long seat life. Seats are out of the flow and can be rotated in line to increase seat life fourfold.
  • Easy maintenance. Seat and ball can be inspected or replaced without removing the free flow from the pipeline.
  • Virtually maintenance free because of the simple design.

Closed, or reflux position
When installed the ball falls automatically into a
closed position. This is possible both in horizontal
and vertical pipes.

Start up and cleaning of the ball chamber
As the pressure on the upstream side of the valve
exceeds that below the valve, the ball rises and starts
to turn.

Dimensions and weights are for guidance only - detailed dimension drawings available on request. * EPDM, Nitrile, Chlorobutyl or Linatex.

Applications:
• Mining and mineral processing   • Power generation   • Sand and gravel
• Chemical and soda ash   • Pulp and paper
• Environmental and effluent

 

 

 

 

 

 

 

 

 

 

 

Click here to download / print this page

CORPORATE HEADQUARTERS:
21 BEDFORD AVENUE
BENONI
SOUTH AFRICA
website: www.dualvalves.com

Dual Valves Logo PO BOX 12520
BENORYN 1504
TEL: +27 11 422 4326/7
FAX: +27 11 421 7842
e-mail: sales@dualvalves.com




INLOCO