Inside each needle-module is a unique pressure control valve which can deliver a consistent, balanced output of aqueous surfactant to each needle ensuring that the requirements of BS 8520-1 & PAS 60-1 are met.

In conjunction with the needle-module a new pumped-surfactant delivery system has  been developed, which:

• Is a robust, durable, all plastic construction.
  
• Features a pump capable of reliably delivering fluid even when the injection needles are elevated many meters above the pump unit.
  
• Allows needles to be used in any combination up to a maximum of 100 without compromising the flowrate at each needle.
• Has a 100+ litre capacity transluscent tank with capacity graduations.
  
• Will self-mix the surfactant.
  
• Incorporates multi-stage liquid-filtration to prevent surfactant-borne debris blocking the needles.
  
• Features factory-set automatic pressure regulating valves requiring no adjustment, so minimising the opportunity for operator error.
• Has a "Dwell-Time" feature for hard-to-wet materials, allowing a repeating cycle of 5 minutes injection followed by 5 minutes waiting - to allow the fluid to be absorbed. This can be over-ridden for constant injection or spray application.

For work at different levels, the pump system can be left on the ground floor and a light-weight pressure control box taken to the higher levels - connected to the pump system by a single quick release hose.

The control unit compensates changes in pressure-head which occur when needles are used at a different level from the pump unit, and ensures a consistent liquid flow of 35ml per minute (+/- 10%) is delivered to each needle.