原文：
调速阀的常见故障及排除方法： 　　调速阀常见的故障有流量调节失灵、流量不稳以及内泄漏量增大三类，这里简单介绍了三大故障的排除方法以供参考。 　　(一) 流量调节失灵： 　　这是指调整节流调节部分，出油腔流量不发生变化，其主要原因是阀芯径向卡住和节流调节部分发生故障等。减压阀芯或节流阀芯在全闭位置时，径向卡住会使出油腔没有流量，在全开位置(或节流口调整好)时，径向卡住会使调整节流调节部分出油腔流量不发生变化。另外，当节流调节部分发生故障时，会使调节螺杆不能轴向移动，使出油腔流量也不发生变化。发生阀芯卡住或节流调节部分故障时，应进行清洗和修复。 　　(二) 流量不稳定 　　减压节流型调速阀当节流口调整好锁紧后，有时会出现流量不稳定现象，特别在最小稳定流量时更易发生。其主要原因是锁紧装置松动，节流口部分堵塞，油温升高，进、出油腔最小压差过低和进、出油腔接反等。油流反向通过QF型调速阀时，减压阀对节流阀不起压力补偿作用，使调速阀变成节流阀。故当进、出油腔油液压力发生变化时，流经的流量就会发生变化，从而引起流量不稳定。因此在使用时要注意进、出油腔的位置，避免接反。 　　(三) 内泄漏量增大： 　　减压节流型调速阀节流口关闭时，是靠间隙密封，因此不可避免有一定的泄漏量，故它不能作为截止阀用。当密封面(减压阀芯、节流阀芯和单向阀芯密封面等)磨损过大后，会引起内泄漏量增加，使流量不稳定，特别会影响到最小稳定流量。

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译文：
Speed Control Valve Common Faults and exclusion method: Control Valve with flow control failure failure, flow instability and increased leakage within three categories, here briefly three major troubleshooting method for reference. (A) flow regulation failure: This means adjusting throttle adjustment part of the oil cavity flow does not change, mainly because of the radial valve adjustment part of the throttle stuck and the failure of such. Throttle valve core or core in the fully closed position, the radial block the cavity did not make the oil flow in the fully open position (or throttle adjust), the radial stuck throttle adjustment will adjust some of the oil cavity flow does not change. In addition, when the throttle adjustment part of the failure, will not adjust screw axial movement, resorted to the oil cavity flow does not change. Stuck throttle valve adjustment occurs or the fault should be cleaned and repaired. (B) of the flow instability Vacuum throttle valve when the throttle speed governor adjustment after a good lock, and sometimes flow instability, particularly in the least stable are more likely to flow. The main reason is loosening locking device, throttle partially blocked, the oil temperature rise, into, out of the minimum oil pressure is too low and into the chamber, the oil chamber reversed so. Reverse oil flow through the QF-type control valve, the valve on the throttle pressure compensation function can not afford to become a throttle control valve. Therefore, when a forward, a change in oil pressure in oil chamber, the flow through the flow will change, causing flow instability. So pay attention to progress in the use, the location of the oil chamber to avoid reversed. (C) increase in leakage rate: Decompression throttle speed governor valve orifice is closed, is sealed by space, so a certain amount of leakage is inevitable, so it can not be used as a cut-off valve. When the sealing surface (valve core, core and one-way throttle valve sealing surface, etc.) and wear too much, it will lead to increased internal leakage to flow instability, in particular, will affect the minimum stable flow.