Sprayers lever-operated

The main types of equipment considered here are the hydraulic sprayers, such as compression (Figure 5.1) and lever-operated knapsack sprayers (Figures 5.2, 5.3) normally used for residual applications to surfaces. Hydraulic sprays may also be applied with motorised pumps on knapsack sprayers, or larger units are carried on a trolley (Figure 5.4) or small vehicle. Pesticides formulated for dilution in water are frequently applied at volumes of around 100-500 litres per hectare. Other types of space treatments and more specialised equipment are considered later. 

Nozzle output is influenced by operating pressure, so, with manually operated pumps on basic lever-operated knapsack sprayers, the pressure will vary... 

The versatility of hydraulic sprayers enables them to be used in a wide variety of situations. There are BSI standards for the compression and lever-operated knapsack sprayers. The relatively inexpensive compression sprayers have a small air pump to pressurise a container of 0.5-10 litre capacity, which is filled with the spray liquid to about three-quarter capacity. Pumping is not required while... 

McAuliffe, D. (1999) Flow control of lever operated knapsack sprayers with CFValve. International Pest Control 41, 21-23, 28. 

Figure 8.6 Operator contamination with different spraying techniques for herbicide application using lever-operated knapsack (LOK) and Herbi CDA sprayers (data from Thornhill et al., 1995) histogram shows s.e. for total deposits. Constant-pressure (spray management) valves (SMV) are now available in a simplified form as illustrated (the Gate valve). Data from Thornhill et al. (1995)...

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