PT. Pohon Mas Sejahtera | Dual Valve (DFV)
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Dual Valve (DFV)

The DUAL 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.

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

  • Rotating and floating ball which 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 which eliminates water 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 Dual Valve from the pipeline.
  • Indicator to show valve in open or closed position.
  • Virtually maintenance free because of the simple design.
  • Simple manual operation – manual handwheel is standard and automatic actuators are not required (but can be fitted).


  • 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, ceramic, etc)
  • Ball is made of hollow carbon steel and is urethane coated. Other elastomer also available. (Stainless steel for high pressure)
  • The seat is made in special abrasion resistant AR steel ( 500 brinell hardness), urethane or stainless steel and is replaceable.
  • Flanges comply with AS, ANSI, DIN, SABS or BS.
  • The ball locking spindle mechanism is made in stainless steel as standard.
  • Working pressure standard are: 16, 25, 40, 80 and 100 bar
  • Operate teperatures to 80℃. Higher conditions are possible if the valve is constructed of the suitable material.

Flushing Port : All valve have a minimum of one purge. One in lower body and one in bonnet area.

PVC bellows: Optional


  • Mining and mineral processing
  • Power generation
  • Sand and gravel
  • Chemical and paper
  • Environmental and effluent