![]() ![]() ![]() The pump is recommended for solutions that require additional mixing (ie. One reason for its popularity is the simplicity of the flow control system. The centrifugal pump is widely used to apply pesticides. Plumbing System for Nonpositive Displacement Pumps If the output from a pump fails to meet the sprayer nozzle and agitation requirements, the pump should be overhauled or replaced. Self Cleaning Strainer (gpm) = Extra flow needed to clean strainer, see section on “Strainers,”ġ (gpm) = Extra flow to assure proper operation of the by-pass valve, and Use the following to determine pump capacity:Ĭapacity = x 1.2īoom Requirements (gpm) = Number of nozzles x flow discharge per nozzle (gpm).Īgitation Requirements (gpm) = Use guidelines given in section “Agitation,” The pump should have sufficient capacity to supply all the nozzles and other accessories, provide agitation and offset pump wear (20% greater capacity). Of these types, roller, centrifugal, and piston pumps are the most widely used on agricultural spraying equipment.Īn important factor in pump selection is discharge capacity. Then the liquid is dispersed by centrifugal force around the edge of the pump casing and through the outlet.Ĭharacteristics of several pump types are outlined in Table 1. The liquid is drawn into the center of the impellers. An example of a nonpositive pump is a centrifugal pump which has an impeller with curved vanes that rotates at high speeds. Typically, the output will decrease dramatically with increasing pressure. The output of nonpositive pumps varies directly with pump speed and is sensitive to pressure (Figure 1). Examples of positive displacement pumps include piston, roller and diaphragm. The pump output is proportional to speed and virtually independent of pressure. The positive displacement pump moves a specific volume of liquid with each stroke or revolution. Most pumps are categorized as positive displacement or nonpositive displacement pumps. The characteristics of a particular pump will usually define the plumbing system. PumpsĪ major component of the plumbing system is the pump. Routine maintenance of the plumbing system is essential. Retrofitting, addition of electrical control systems, and replacement of pumps or nozzles require proper knowledge of the plumbing system and the implications of these changes to sprayer performance. Sprayer problems may occur if plumbing and/or modifications are improperly done or maintenance is ignored. ![]() The plumbing systems of agricultural sprayers are usually considered foolproof. ![]()
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