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DFV

DFV new0.png

DUAL VALVE

DUAL'S 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. The handwheel is there to lock the ball in position. The handwheel can be used to isolate, but with back pressure. The Dual Valve can work in the horizontal and vertical position.

FEATURES

  • The Dual Valve is the only proven maintenance and trouble-free slurry valve in the world with all these features:

  • 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.

  • Rotating and floating ball - self adjusts to flow.

  • Self cleaning due to the freely rotating ball.

  • Long ball life due to ball rotation.

  • Replaces two valves: check valve and either a gate, knife gate, pinch or diaphragm valve.

  • Full port opening. No obstruction to the flow.

  • Virtually no pressure drop. Eliminates pipe hammer.

  • Indicator to show valve in open or closed position.

  • Virtually maintenance free because of simple design.

  • Simple manual operation - manual handwheel is standard and automatic actuators are not required (but can be fitted).

APPLICATIONS

  • Mining and mineral processing.

  • Power generation.

  • Sand and gravel.

  • Chemical and soda ash.

  • Pulp and paper.

  • Environmental and effluent.

SPECIFICATIONS

Size Range

80mm - 600mm.

Operating Temperatures

-20˚C to 100˚C.

Body Type

Fabricated Carbon Steel or Stainless Steel.

Pressure Rating

0 Bar to 100 Bar.

(For higher pressures, please consult our factory).

Ball Lining

Natural Rubber, EPDM, Butyl, Urethane.

Ball

Carbon Steel, Urethane Coated or Stainless Steel.

Valve Type

Flanged

Flange Drilling

AS, ANSI, DIN, SABS or BS.

Flow Rate

See pressure drop chart.

Flushing Port

All valves have a minimum of one purge: one in the lower body and one in the bonnet area.

PVC Bellows

Optional.

Material Certification

Certified Chemical and Physical test reports can be supplied.

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