With the development of the∏×Ω hydraulic system of the injection molding machγ&ine towards Middle and high pre₽∞★αssure, the pilot rel∏εief valve is widely used in the £♥control oil circuit of the ®✘ hydraulic system of the injection mo↑ lding machine.

In practice, in order to maximi≠€>ze its efficiency, mainten♥₹&ance of the control system,π>×→ accurate and timely diagnos€ ₹is and troubleshooting of the pilot relief val£☆↓ve is a key link. The failure of the pilot r¶ββelief valve will cause the injection moldi∞≤¥≥ng machine to fail to operate. According to th∞λ‍e phenomenon, the reasons are as follows: the spr♣α₩"ing of the valve core of the pilo&"★≠t valve is broken, the orifice is blocβ®₽ked; the seal of the valve port ‍σ↓of the pilot valve is poor, '​≤and the main valve core₩> is stuck, etc. The corresponding eliminati©✘↕on measures are replacing or add δing a flat pad at the broken part for emergencα↓y use, cleaning and dredging; grinding or bre☆&aking the oil circuit for emergency us÷™¶e, grinding and cleaning.

Unstable pressure limit: the p÷↑™∞ilot relief valve is unstable ←<™'pressure limit, which means that the>α  hydraulic system pressu₹→♣re is low or high, the hydraulic actuaσ¥≤tor is weak or the oil pipe, pump ♠★→body and valve body burst. The causes of this f∑♦♠ault are: improper pressure adjustmen ∑t; bent or soft spring of pil↑γot valve spool; dirty oil₩∑β or poor flow of oil. The co≤®φ₹rresponding eliminatiπλ<Ωon measures are readjustme®≤•nt, correction, padding or replacement, replace>εment and cleaning. The instability of₽σ the pilot relief valve is a♦✘↓♥ gradual failure, and t♠↔☆©he failure of the pilot relief valve is a su•♠©λdden failure. After troubleshoα©oting, the pressure controlled b ♦÷y the pilot relief valve shoul♠↔♣d be readjusted accordi∞≈ng to the pressure lim¶π☆☆ited by the injection moldin•₽₹§g machine system.