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原文
Hydraulic valve seal material history and status Valve and valve seat contact surface leakage is the result of work to squeeze into the liquid molecules. Affect the sealing effect is mainly due to valve and seat contact pressure ratio, roughness, and pressure. When the spool and the valve seat of the joints in P pressed force, work force F squeeze the liquid molecules, sealing materials will produce elastic deformation. If the seal resistance greater than the vice president of molecular repulsion, then sealed and effective, otherwise it will form a leak. Early hydraulic support, no seal between the deputy campaign measures, direct contact with the metal seal, which called for sealing contact plane coincide with high precision, or to increase the sealing of the binding force, the contact surface of the plastic deformation, plug the leak channel
原文来自：http://www.ballvalve.org.cn

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译文：
阀芯和阀座接触面的泄漏，是工作液体分子挤入的结果。影响密封效果的主要原因是阀芯和阀座的接触比压、不平度及压差。当阀芯与阀座的接合面以P力压紧，工作液体分子以F力挤入，密封材料会产生弹性变形。如果密封副总抗力大于分子斥力，则密封有效，否则就会形成泄漏。早期的液压支架，运动副之间没有其他密封措施，是金属直接接触密封，即要求密封副接触平面吻合，具有较高的加工精度，否则必须加大密封副的结合力，使接触表面产生塑性变形，堵塞泄漏通道

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