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Common malfunction of pilot solenoid valve
1. There are obvious wear and grooves on both ends of the pilot type solenoid pin, with visible spalling and short scratches on the surface.
2, the upper pin hole of the valve core is worn, and the inner side of the pin hole has a more obvious groove formed by the grinding pressure. The micro morphology shows the features of the abrasive debris and short scratches, and the edge of the grinding mark is the shape of the metal debris which is squeezed and rolled. There are obvious wear marks at the bottom of the inner cavity of the valve core and the adjusting screw, and a circular pit is formed by the middle position. The micromorphology shows the microscopic characteristics such as exfoliation and corrosion of micropores.
3, there is partial wear on the outer surface of the stem only, and there is partial exfoliation, and the local area leaves the groove characteristics which are basically parallel to the axial direction. It can be considered that there is a circumferential relative motion between the valve core and the stem.
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