Dual Flow Valve (DFV)
Dual Flow Valve (DFV)
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.
DFV 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).
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SIZE RANGE: |
80mm – 600mm. |
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OPERATING TEMPERATURES: |
-20˚C to 100˚C. |
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BODY TYPE: |
Fabricated Carbon Steel or Stainless Steel. |
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PRESSURE RATING: |
0 Bar to 100 Bar. (For higher pressures, please consult our factory). |
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BALL LINING: |
Natural Rubber, EPDM, Butyl, Urethane. |
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BALL: |
Carbon Steel, Urethane Coated or Stainless Steel. |
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FLOW RATE: |
See pressure drop chart. |
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VALVE TYPE: |
Flanged. |
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FLANGE DRILLING: |
AS, ANSI, DIN, SABS or BS. |
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FLUSHING PORT: |
All valves have a minimum of one purge: one in the lower body and one in the bonnet area. |
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PVC BELLOWS: |
Optional. |
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MATERIAL CERTIFICATION: |
Certified Chemical and Physical test reports can be supplied. |
Head Office
166 Rotterdam Road, Apex Industrial, Benoni, Gauteng, South Africa
Call Us
(+27) 11 422 – 4326/7