Installation of imported oil o-ring (O-type rubber seals) requirements before installing O-ring (O-type rubber seals), check the following: 1. the introduction angle is processed by drawing a sharp edge chamfer or whether round; 2. whether burr inside diameter surface pollution; 3. Is seals and parts already apply grease or lubricant fluid (to ensure media compatibility elastomer recommended to lubricate the seal with liquid); 4. not use greases containing solid additives, such as molybdenum disulfide, zinc sulfide. Manually install the anti-oil o-ring (O-type rubber seals): 1. Use no sharp edges of tools; 2. Ensure the O-ring (O-type rubber seals) is not distorted, not excessive stretch O-ring (O-type rubber seals); 3. Try to use aids to install the O-ring (O-type rubber seals), and to ensure correct positioning; 4. For sealing strip bonded to the O-ring (O-type rubber seals), shall not be stretching at the connection. Twisted damage: damage caused by many reasons twisted, foremost of which is due to the clearance between the piston rod and cylinder uneven, eccentric too large, oil o-ring cross-section diameter caused by uneven due cause O-ring uneven friction by more than a week, and some parts of the friction O-ring is too big, distorted. Generally, the smaller section size O-rings, prone to uneven friction. Distorting (large sports section with O-ring fixing than the diameter of the O-ring is the truth.) In addition, due to the existence of the seal groove concentricity error, sealing height unequal and uneven-sectional diameter of the O-rings and other phenomena , may be such that a portion of O-ring compression is too large, too small, or another part of the uncompressed. When the presence of the trench that is coaxial eccentric deviation is greater than the amount of compression of the O-ring seal will be completely ineffective. Seal groove coaxial harm another large deviation is the O-ring in the circumferential compression uneven. There are also due to the uneven O-ring cross-sectional diameter, material hardness, the lubricant film thickness and the surface roughness of the shaft seal and other factors, led to a part of the surface along the O-ring sliding, rolling and partly occurs, resulting in twisted anti-oil imports o-rings. Movement circle so easily damaged due to distortion, which is an important reason for the occurrence of damage to the sealing means and leakage. Thereby increasing the sealing groove machining precision and reduce bias is to ensure that the O-ring seal and a reliable life of the important factors.