In the practice of using the guiding overflow valve to maximize efficiency, protection control system, the accurate and timely diagnosis and eliminate straight-pilot overflow valve fault is a key ring. Straight-pilot overflow valve failure, will cause the injection molding machine can't move. According to the phenomenon, to analyze its reasons: pilot valve core spring break; Yin hole plugging; Pilot valve mouth sealed; The main valve core is jammed, etc. Ruled out measures are: replace or add flat washer in broken to emergency use; Cleaning dredge; Grinding or will the oil circuit breakers for emergency use; Grinding, cleaning. Unstable pressure limiting: straight-pilot overflow valve pressure limiting instability, characterized by the hydraulic system pressure is low or high, hydraulic actuators movement unable or tubing, pump body, valve body burst. The causes of the failure are: improper pressure adjustment; Pilot valve core spring bending or soft; Oil had dirty or the oil flow. Ruled out measures are: to adjust; Correction, padded or replacement; Replacement and cleaning. Straight-pilot overflow valve pressure limiting instability for gradual failure, straight-pilot overflow valve failure for sudden fault, in after rule out the failure, should according to the injection molding machine system limit pressure of straight-pilot overflow Industrial Valves control to adjust.
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