(A) flow adjustment failure flow adjustment failure, refers to the regulation of the hand wheel after the oil chamber flow does not change (simple throttle without this phenomenon). The main reason that causes the flow control failure is that the valve core is jammed in the radial direction. When the valve core is jammed in the radial direction in the fully-closed position, no oil flow is generated after the adjusting handwheel is adjusted. When the valve core is in the fully open position or the throttle Adjust the radial opening after a good stuck, adjust the hand wheel outlet flow does not change. Occurred after the valve core stuck in the radial should be cleaned to exclude dirt. When the one-way throttle valve into and out of the oil chamber when the reverse (then play the role of one-way valve), adjust the hand wheel flow through the valve will not change. (B) the flow is not stable Throttle and one-way throttle When the throttling port adjusted and locked, sometimes there will be unstable flow phenomenon, especially in the minimum steady flow more easily. The main reason causing the instability of the flow is that the locking device is loose, the throttle is partially blocked, the temperature of the oil is increased, and the load pressure changes. After the throttle is adjusted and locked, the locking device will loosen due to mechanical vibration or other reasons, so that the flow passage area of ​​the throttle will be changed and the flow rate will change accordingly. Impurities in the accumulation and adhesion of oil in the throttle edge, the over-flow area decreases, causing traffic to reduce. When the pressure oil washed away impurities, so that the throttle back to the original flow area, the flow rate also returned to its original value, thus causing the flow instability. When the flow of oil through the throttle valve temperature changes, will change the viscosity of the oil will cause instability flow; when the load changes, the pressure changes, will make the throttle before and after the oil pressure difference occurred Changes, too, can cause traffic instability. Measures to prevent unstable flow, in addition to prevent the throttle clogging method, but also can take to strengthen the oil temperature control, tighten the locking device and as far as possible to make the load pressure does not change, or less changes and other measures. (C) the increase in leakage Throttle or one-way flow valve orifice closed, the gap seal with the Department must have leakage, so throttle or one-way throttle valve can not be used as a stop valve. When the sealing surface wear is too large, it will cause increased leakage, sometimes also affect the minimum steady flow, this time should be replaced spool.
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