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１.減壓閥進出油口接反了：對板式閥為安裝反向，對管式閥是接管錯誤。使用時應注意閥上油口附近的標記，或查閱液壓無件產品目錄，不可設計錯和接錯。
２.進油口壓力太低，經減壓閥芯節流口后，從出油口輸出的壓力更低，此時應查明進油口壓力低的原因（例如閥故障）。
３.減壓閥下游回路負載太小，壓力建立不起來，此時可考慮在減壓閥下游串接節流閥來解決。
４.先導閥（錐閥）與閥座配合面之間因污物滯留而接觸不良，不密合；或先導錐次有嚴重劃傷，閥座配合孔失圓，有缺口，造成先導閥芯與閥座孔不密合。
５.拆修時，漏裝錐閥帶來錐閥未安裝在閥座孔內。對此，可檢查錐次的裝配情況或密合情況。
６.主閥芯上阻尼孔被污物堵塞，Ｂ腔的油液不能經主閥芯下端的阻尼孔a流入主閥彈簧腔，出油腔B的反饋壓力傳遞不到先導錐閥上，使導閥失去了對主閥出口壓力的調節作用；阻尼孔a堵塞后，主閥彈簧腔失去了油壓的任用，使主閥變成一個彈簧力很弱（只有主閥平衡彈簧）的直動式滑閥，故在出油口壓力很低時，便可克服平衡彈簧的任用力而使減壓閥節流
口關至最小，這樣進油口A的壓力油經此關小的節流口大幅度降壓，使出油口B壓力上不來。
7.先導閥彈簧（調壓彈簧）錯裝成軟彈簧，或者因彈簧疲勞產生永久變形或者折斷等原因，造成B腔出口壓力調不高，只能調到某一低的定值，此值遠低于減壓閥的最大調節壓力。
8.調壓手柄因螺紋拉傷或有效深度不夠，不能擰到底而使得壓力不能調到最大。
9.閥蓋與閥體之間的密封不良，嚴重漏油，造成先導油流量壓力不夠，壓力上不去。產生原因可能是O形圈漏裝或損傷，壓緊螺釘未擰緊以及閥蓋加工時出現端面不平度誤差，閥蓋端面一般是四周凸，中間凹。
10.主閥芯因污物、行刺等卡死在小開度的位置上，使出口壓力低，可進行清洗與去毛刺。
1. The pressure reducing valve in and out of the oil meet the mouth: for installation of valve plate reverse, for tubular valve is to take over the error. Valve should be paid attention to when using oil near the mouth of tags, or refer to product catalog for all hydraulic parts, design right and wrong.
2. The inlet pressure is too low, after reducing valve core throttling mouth, lower output from the oil outlet pressure, this time should be found out the cause of the low inlet pressure (such as valve failure).
3. The pressure reducing valve downstream circuit load is too small, pressure build up, at this time may be considered in the downstream of the pressure reducing valve concatenated throttle valve to solve.
4. The pilot valve (cone valve and valve seat due to dirt retention and poor contact between mating surface, not closed; Or the guide cone with serious scratches, seat with hole circle, there are gaps, caused the guide valve core and valve seat hole is not closed.
5. When repairing and packing cone valve cone valve is not installed in the valve seat hole. To this, can monitor the assembly of the cone times or closed.
6. The main valve core on the damping hole were choked up with dirt, B cavity oil cannot damping hole of the bottom of the main valve core into the main valve spring chamber, a B's feedback of the oil cavity pressure transmission is less than the guide on the cone valve, make the lost to the main valve outlet pressure pilot valve adjustment; Damping hole after a block, the main valve spring cavity lost oil pressure of employment, the main valve into a spring force is very weak (only the main valve spring balance) straight moving type valve, therefore the oil outlet pressure is low, can overcome the balance spring force and make the pressure reducing valve throttle
Mouth shut to minimum, so oil inlet. A pressure oil through the closed small throttle opening large step-down, pulling oil mouth B on the pressure not to.
7. The guide valve spring (pressure regulating spring) wrong like a soft spring, or cause permanent deformation or fracture by spring fatigue, caused B cavity outlet pressure adjustment is not high, can only be transferred to a low fixed value, this value is far lower than the maximum control pressure of the pressure reducing valve.
8. The regulating handle a strained thread or effective depth is not enough, cannot twist exactly and cannot be transferred to the maximum pressure.
9. Bonnet seal between the body and bad, serious leakage, the forerunner of oil flow pressure is not enough, the pressure couldn't get on. Reasons may be the o-ring packing or damage, compression screw does not tighten and there was a face cover processing roughness error, cover face is generally all round convex, concave in the middle.
10. The main valve spool due to dirt and assassinate stuck in the small open position, make the outlet pressure is low, can be washed and deburring.
