DRAFT
4.1.3Angle of Sprayheads
Sprayheads should normally be angled so as to maximise the width of the band of spray deposited and to allow the turbulent airstream to disturb foliage in order to achieve maximum penetration and
Sprayheads mounted on horizontal booms should face backwards with the axis of the atomiser at an angle of 30 – 45 degrees to the vertical for fungicide and insecticide application. However, they should face downwards at 0 – 10 degrees to the vertical for herbicide or liquid fertilizer application.
Sprayheads used to spray sideways on tree or bush crops should face outwards from 0 – 45 degrees backwards to the direction of travel and should also be angled upwards or downwards according to the foliage to be sprayed.
IMPORTANT: Sprayheads must never be positioned so that spray droplets can be blown towards the driver or operator of the sprayer. Ensure that all spray is blown clear of the sprayer structure to eliminate contamination and
4.2Hydraulic System
Hydraulic power for Turbofan Sprayheads can be provided either from the tractor hydraulic system or from an hydraulic pump driven by the power
The following notes are intended as a guide to the design of the hydraulic system and the choice of components. When building a system it is vital that all components should be selected so as to have a safe working pressure well in excess of the operating pressure, taking into account the harsh environment of an agricultural operation.
4.2.1Hydraulic Configuration
•It is recommended that Turbofan Sprayheads are normally connected in parallel
•Drain lines must be fitted to all motors.
It is possible to connect Turbofan Sprayheads in series but the numbers of motors in each series chain should be limited to two. It is important to note that the pressure drop across series pairs of motors is approximately 200 bar which is higher than most tractor hydraulic systems can provide. Drain lines must also be fitted to all motors connected in series.
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