As the engineering machinery hydraulic system development, in the direction of medium and high pressure and ultrahigh pressure straight-pilot overflow valve widely used in engineering machinery hydraulic system control oil circuit. In the use of practice, to maximize its effectiveness, protection control system, the accurate and timely diagnosis and eliminate straight-pilot overflow valve fault is a key ring. 1, control failure, make host straight-pilot overflow valve failure, will cause the host cannot move. According to the phenomenon, to analyze its reasons: pilot valve core spring break; Yin hole plugging; Pilot Industrial Valves 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. 2, 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, more appear on the reserve motor hours more engineering machinery; Straight-pilot overflow valve failure for sudden fault, appear on the reserve motor hours less engineering machinery. In after rule out the failure, should press machine is defined by the system into straight-pilot overflow valve to control pressure of the pressure to adjust.
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