. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. LS Another kind of rotary pump equipped with flexible rubber impellers, as the diagram shows. These are becom- ing increasingly popular because their cost is low, and they are not damaged by abrasives in the spray liquid. CAUTION: The rubber impellers on these pumps do not stand up well when used in sprays having a high oil content, and care must be taken never to allow this pump to run dry. The design of most types will not permit pressures of over 20 to 50 psi. TANK HYDRAULIC TYPE AGITATOR. VALVE D GAUGE =^TO BOOM ^VALVE
. Chemical weed-control equipment. Weeds; Spraying; Spraying equipment. LS Another kind of rotary pump equipped with flexible rubber impellers, as the diagram shows. These are becom- ing increasingly popular because their cost is low, and they are not damaged by abrasives in the spray liquid. CAUTION: The rubber impellers on these pumps do not stand up well when used in sprays having a high oil content, and care must be taken never to allow this pump to run dry. The design of most types will not permit pressures of over 20 to 50 psi. TANK HYDRAULIC TYPE AGITATOR. VALVE D GAUGE =^TO BOOM ^VALVE B Centrifugal and turbine pumps do not require by-pass pressure regulators or relief valves. Pressure may be con- trolled by a diaphragm type, pressure reducing valve, or by opening the control valve, as shown in the accompanying dia- gram. Here, valve "D" may be a pressure reducing valve or a simple gate valve if pump pressure is reasonably steady. This model has venturi-operated hydraulic agi- tation and backfill. Backfill is operated by connecting a suction hose at valve "B" and by opening valves "B" and "C" and closing valve "; [13]. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Akesson, Norman B. (Norman Berndt), 1914-; Harvey, W. A. (William Alfred), 1914-1989. Berkeley, Calif. : University of California, College of Agriculture, Agricultural Experiment Station
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Keywords: ., bookcentury1900, bookpubli, booksubjectspraying, booksubjectweeds
