Speed ​​control valve common troubleshooting and troubleshooting: speed control valve common fault flow adjustment failure, flow instability and increased leakage within the three categories, here is a brief introduction to the three troubleshooting methods for reference. (A) flow adjustment failure: This refers to adjust the throttling regulation part of the oil chamber flow does not change, the main reason is the valve core radial jamming and throttling regulation part of the failure. When the pressure reducing spool or throttle spool is in the fully closed position, radial jamming will cause no flow in the oil chamber. When the valve is fully open (or the throttle is well adjusted), radial jamming will cause adjustment throttling Adjust the part of the oil chamber flow does not change. In addition, when the throttle adjustment section fails, will make the adjustment screw can not move axially, so that the oil chamber flow does not change. Occurred in the spool stuck or throttling regulation failure, should be cleaned and repaired. (B) of the flow is not stable decompression throttle valve When the throttle adjust the lock, and sometimes there will be unstable flow phenomenon, especially in the minimum steady flow more easily occur. The main reason is the locking device is loose, throttle part of the block, the oil temperature rise, into the oil chamber minimum pressure is too low and into the oil chamber and so on. Reverse flow through the QF-type governor valve, the pressure reducing valve on the throttle valve does not play a role in pressure compensation, the governor valve into a throttle valve. Therefore, when the inlet and outlet oil pressure changes, the flow through will change, causing the flow instability. Therefore, when used to pay attention to the location of the oil chamber to avoid reverse. (C) increase the amount of leakage: decompression throttle valve throttle closed, it is sealed by the gap, it is inevitable that there is a certain amount of leakage, it can not be used as a stop valve. When the sealing surface (decompression valve core, throttle valve and one-way valve core sealing surface, etc.) wear too much, it will cause increased internal leakage, the flow instability, in particular, will affect the minimum steady flow. This article Keywords: valve