The common faults of the valve outlet pressure is nearly equal to the inlet pressure, no decompression

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Timing Belt Pulleys

     The common faults

     (1) The outlet pressure is nearly equal to the inlet pressure, no decompression

The performance of the fault phenomena: the valve inlet and outlet pressure are equal, and rotating the regulator outlet pressure is notwith the pressing handle change. Causes and solutions are as follows.

For the main valve or valve hole groove edge has a clearancebetween the inside burr or the main valve core and the valve holewith dirt, or because of the main spool or the valve hole shape and position tolerance, hydraulic clamping, the main valve core card go away in maximum (max) position, because the opening is big, oilwithout decompression. At this point, according to the above conditions were taken for deburring, cleaning and repair the valve hole and valve precision excluded.

      The main valve spool and valve by tight hole, or assembly gallingvalve hole or valve spool, will go away position at the maximum, thegap and reasonable. The type J valve clearance is generally 0.007~ 0 015mm, equipped with front can be properly grinding valvehole, with the spool.

     The main spool valve seat hole short damping hole or blockage,lost the automatic adjustment function, the main valve spring force,the main valve to the maximum opening, become straight without hindrance, the inlet pressure is equal to the pressure of the outlet.Compressed air is blown through the damping holes with diameter of 1 Omm steel wire or available, and cleaning and assembly.

     The J type pressure reducing valve, damper with damping hole ispressed in the main valve, use may cause interference not out. Out,the oil inlet cavity and the oil cavity pressure equal to (without damping), and the valve core force equal to the area, but the oil chamber with a spring, so that the main valve is at its maximumopening position, the outlet pressure is equal to the entrancepressure. The need to re process diameter damping is slightly larger and re pressed in the main spool.

     The JF type pressure reducing valve, factory oil alone L is blockedoil plug. When the plug is not screwed out while in use, so that the main valve on the chamber (spring cavity) trapped oil, leading to the main valve in the maximum opening without decompression. J type pipe valve with the same. J type valve if the design and installation of board did not make L communicated with the oil tankwill also appear this phenomenon.

     The J type tube type valve, overhaul easily when the valve coverinstalled wrong (wrong direction 90 ° or 180 °), the leakage of oil export blocked, unable to drain, causing oil trapped above, so that the main valve top opening at the maximum without decompression.Repair the valve cover can be installed on the assembly direction.

     The JF type valve cover installed wrong, the direction, the outputand the oil hole oil drain hole, causing no decompression, also must pay attention to.