对济钢中厚板厂进口 30 0 0 t液压矫直机液压缸密封装置进行改进 ,采用三道格莱圈取代原活塞环和 Nutring副密封 ,活塞与活塞杆间增加一道 O形圈 ,活塞杆的密封用两道斯特封取代原 V形组合圈。改进后的密封装置消除了内泄漏 ,降低了投资 Jigang plate factory imported 30 0 t hydraulic straightening machine hydraulic cylinder sealing device is improved, the use of three Gelai circle instead of the original piston ring and Nutring deputy seal, the piston and the piston rod to add an O-ring, the piston Rod seal with two Dust seal instead of the original V-shaped ring. The improved seal eliminates internal leakage and reduces investment