1. motion direction first determine the direction of movement of seals, such as reciprocating, rotating, spiral or fixed. It

2.密封重点-例如决定活动点是在内径的拉杆封或活动点是在外径的活塞封等。 

2. the key points for sealing - for example, deciding whether the movable point is the pull rod seal inside the inner diameter or the movable point is the piston seal at the outer diameter. It

3.温度等级-从原厂机械使用说明查阅或按实际工作环境评估工作温度，决定所需使用材料。有关温度等级的说明可参考下面的生产用户注意事项。 

3. temperature grade - consult the original machine instructions or evaluate the working temperature according to the actual working environment to determine the required materials. Instructions for the temperature class can be referred to the production users' attention below. It

4.压力等级-从原厂机械使用说明查阅有关数据，或通过观察原密封件的软硬度和结构推断工作压力等级，有关压力等级的说明可参考下面的生产用户注意事项。 

4. pressure grade - refer to the relevant data from the instructions of the original plant mechanical use, or to infer the working pressure grade by observing the soft hardness and structure of the original seal. The description of the pressure level may refer to the attention of the production users below. It

5.尺寸大小-多数用户都会按使用过的旧样品选购，但密封件在使用一段时间后，会被温度、压力及磨损等因素大幅影响其原来的尺寸，按样选择只能作为一个参考，更好的方法是量度密封件所在位置的金属槽尺寸，准确性会较高。

5. size size - most users will be selected according to the old sample used, but after a period of use, the seal will be greatly affected by temperature, pressure and wear and other factors. The selection can only be used as a reference. The better method is to measure the size of the metal slot at the location of the seal, and the accuracy will be more accurate. High.