Enhances the purchase seal accuracy

1. the heading - prerequisite decides the seal institute in the position heading, for example reciprocation, revolving, screw or fixed. 　　
2. the seal key - for example decision spot is seals or the active spot in the inside diameter tension bar is seals and so on the outer diameter piston. 　　
3. the temperature rank - from the original factory machinery operating instructions consult or according to the practical work environment appraisal operating temperature, decided that must use the material. Related temperature rank's showing may refer to the following production user matters needing attention. 　　
4. the pressure rating - from the original factory machinery operating instructions consult related data, or through observes original seal soft degree of hardness and the structure inference working pressure rank, related pressure rating's showing may refer to the following production user matters needing attention. 　　
5. the size dimension - most users can according to having used the old sample select and purchase, but seal after using period of time, by factors and so on temperature, pressure and attrition affects largely its original size, will choose according to sample can only take a reference, a better method will measure the seal institute in the positionThe metal trough size, the accuracy will be high.