Governor valve failures are common failure of flow regulation, flow instability and increased leakage within the three categories, here a brief introduction of the three trouble-shooting methods for reference.

    (A) flow regulator failure

    This refers to the adjustment of throttle adjustment part, the oil chamber flow rate does not change, mainly due to the radial stuck and the throttle valve core part of the failure of regulation and so on.

    Core or the throttle valve closed position in the entire core, radial stuck out of the oil will not flow chamber, in the fully open position (or the mouth to readjust the throttle), the radial will adjust the throttle stuck conditioning part of the cavity out of the oil flow rate 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. Place-conditioning part of the throttling spool jammed, or failure, should be cleaned and repaired.

    (B) Flow instability

    Decompression-type throttle control valve when the throttle lock, after I adjusted well, sometimes there flow instability, particularly in the minimum stable flow more likely. The main reason is the locking device loosening, cutting mouth partially blocked, oil temperature rise, into and out of the oil pressure is too low and into the smallest cavity, the oil chamber reversed and so on.

    Oil flow back through the QF-based speed control valve, pressure reducing valve on the throttle can not afford to compensate, so that control valve into the throttle. Therefore, when entering and leaving the oil cavity fluid pressure changes, the traffic flows will change, causing flow instability.

   Therefore, when you should pay attention to the use of entering and leaving the location of the oil chamber to avoid reversed.

    (C) The increase in leakage

    Decompression speed throttle-type throttle valve port is closed, depending on clearance seal, it is inevitable that a certain amount of leakage, so it can not be used as a cut-off valve. When the sealing surface (valve core, core and one-way throttle valve core sealing surface, etc.) wear and tear is too large, it will cause an increase in the amount of leakage, so that flow instability, in particular, will affect the stability of flow to a minimum.

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