Internal Dart Valves

iDart with flexible coupling

DART’s internal dart valves are bodiless valves suitable for installation within the slurry tank, cell or box. There are two main variations – self-contained triDart valves which are factory calibrated and installed as a single unit; and iDart valves which have a bolt down seat cage with only a shaft extending to the actuation unit. Both types offer the stability and reliability advantages of head-guiding where the plug is guided into the seat with bars set out all around the plug.

Do you have these issues?

  • Poor level control or Spillage
  • Bending or breaking of shafts
  • Excessive wear
  • Misalignment of valve and actuator shaft
  • Bouncing or vibration of valves, poor coupling.
  • Maintenance problems

Then eDART internal valves will benefit you.



General Information


  • Modulating Control or On/Off applications.
  • Fully customisable design.
  • Anti-Rotation device on the plug.
  • Stroke indication.

Material of Construction

  • Phenoline Painted Mild Steel or Stainless Steel bodywork.
  • Polyurethane protected shafts and guide bars

Standard Sizes

  • 80 mm to 1,000 mm.


  • Supplied with or without an actuator.
  • Bias Spring Fail Closed, Fixed or Double Acting Actuator or handwheel.
  • Smart (HART, Profibus, Foundation Fieldbus), Electro-Pneumatic (4 – 20 mA), Pneumatic (20 – 100 kPa) Positioner.
  • Safety Guards enclosing feedback mechanism.
  • Electronic feedback within the actuator for applications where mechanical feedback is problematic (i.e. long or dirty applications).


  • Large flotation machines.
  • Deep distribution boxes (includes integral head guiding).
  • Splitter boxes.
  • Distribution boxes.
  • Conditioner tanks.

Product Variations

The TriDart is a self-contained internal dart valve which is dropped into the vessel and bolted down. It has the distinct advantage of being pre-assembled and calibrated prior to shipment to site. The TriDart is recommended for tank depth of up to 2–3 metres.
iDart with flexible coupling
The valve needs the simple steps of bolting down the actuator mounting plate to the framework and the seat cage to the vessel; then the positioner needs to be calibrated. The valve does not require additional internal guide plates as the guiding is done on the plug head.
The sealed TriDart has bellows, in the same arrangement as the single and dual external dart valves, so the valve can be used in a pressurised vessel such as the underflow of a cyclone.