Dual External Dart Valves

Dual eDart

The Dual eDart – or external to a vessel dual dart valve – is specifically designed for the flotation market.  It has been optimised for slurry flow by having two plugs and seats within the body.  This gives the valve a high rangeability and fine control.  Because the valve is external to the vessel it is well suited to upgrade projects and where safety is a concern, the valve, in conjunction with knife gate valves, may be isolated and easily maintained.

Do you have these issues?

  • Poor level control
  • Valve operating outside of the 40-60% range
  • Excessive wear
  • Spillage
  • Bouncing or vibration of valves
  • Maintenance problems

Then eDART external valves will benefit you.  The dual eDart valve is optimised for fine level control of slurry typically on flotation banks.  There are two plugs and seats in this valve body to improve turndown and by using an intelligent signal splitter, such as the eDART DVC, great control may be achieved.

Typical applications for external dual valves
  • Flotation machine level control
  • Distribution box level control
  • highly suitable for plant upgrades where throughput increases because the valve bolts to the side of the vessel
  • ideal for safety reasons because maintenance doesn’t need to be done within the confines of the vessel

Product Variations

Cartridge Dart Valve
This valve is a good example of how customisable the body is.   This style was designed to suit an existing plant layout but may also be used in a new build to reduce the amount of civil construction necessary.  The valve has a rectangular outlet in the same vertical plane as the rectangular inlet and is orientated horizontally (the inlet and outlet flanges are parallel).  It is suited for plant upgrades where the space between flotation tanks is severely limited. Often-times the actuator pedestals are rotated 90 degrees on the bonnet and with the use of the Large Actuator internal feedback actuator, both positioners (and a DVC) may be placed on the side of the walkway.  Where tank spillage is a problem, a special awning (strong enough to lift the valve) located above the valve may be supplied. When used on the last cell of a bank where there is no step, the cartridge valve allows for upwards flow through the seat and can be used in conjunction with a back pressure pipe which reduces the overall height of the bank. Another spin off is that this allows a metallurgical sampler to be installed conveniently.
Dual dart valve with round outlet
This variation of the dual dart valve has a round outlet in the same vertical plane as the rectangular inlet and points 10° down. It is suited to some plant layouts better than the left or right versions.
dual valve with side outlet
In this configuration the pipe outlet is orientated at 10° down and perpendicular to the rectangular inlet. To determine whether a left or right configuration is required, consider a particle entering the rectangular inlet, the orientation is determined from the perspective of that particle: so either down and left or down and right.