Double seals: Material code for the secondaryseal is directly followed by the product seal face codes.
注： 双端面机械密封的型号表示方法为：在产品型号规格的后面书写两组材料代号，用横线相连。
2
They are designed to provide a secondaryseal in the event the cylinder valve develops leakage through the valve seat.
它们是设计用来在钢瓶阀门通过阀座产生泄漏的情况下提供一个二次密封。
3
To study the influence of O-rings secondary seals, deformation behaviors of mechanical seal faces were analyzed under different pressures with the method of integral contact analysis by FEM.