Research on the determination of some properties of valve parts of diaphragm pumps used in sprayers

Abstract

One of the most important things for plant protection that is performed by using sprayers is to determine whether any spray system works within desired limits or not. The changing of spraying characteristics happens by different spray equipment under different working and application conditions. For this reason which part or parts of sprayers affect the spraying characteristics and how this happens must be determined. At the same time, the effects of different applications and working conditions on the spraying characteristics must also be determined carefully. In this way, it can be decided that spraying and sprayers are suitable for a particular aim. In this research, corrosion in valve parts and valve springs of sprayer pumps were investigated, and toward achieving this goal, a total of 200 springs (100 new unused springs and 100 used springs) were examined. After the tests, spring coefficient values, displacement amounts, and frequencies were determined. Changes in new and used springs were determined by using the research findings. In this study, all the valves used for tests had plastic trunks. These valves were different from the materials of flat discs. When valves were examined, it was found that all parts of valves except spring itself can be produced fully with plastic materials or they can be produced partially out of plastic (trunk) and metal materials (other parts). Measurements showed that flat discs made of metal material are thicker than the others. Also, big differences between the measurement results of new plastic and metal materials were not observed. The reason for this can be attributed to the fact that plastic materials are produced by a casting process. Measurement differences are observed in metal parts because these parts are produced one by one manually. In the research region, it was determined that 73% valves are made of plastic materials. Flat disc thickness (B 1) values were found to be thicker in metal discs than in plastic discs. BI values were found to be 2.52 mm for plastic materials and 1.40-2.52 for metal materials. After using these valves, plastic discs became 4% thinner and metal discs became 45% thinner than new valves. Flat disc diameter (B3) decreased for used valves. This decrease was found to be 3.5% for metal discs and 1.34% for plastic discs. The total height of valve head (B2) decreased 17.61% for plastic heads and 39.6% for metal heads. The height of bearing part of valve head (B4) decreased 13% for plastic heads and 14% for metal heads. The diameter of bearing part of valve head (135) decreased due to the stroke of flat disc to valve head. Corrosion ratios were found to be 2.34% for metal valve heads and 0.6% for plastic heads.