1. The diametre of seat turns bigger when flap moves higher and smaller when flap lower. 根据阀瓣的这种形动形式,阀座通口的变化就是与阀瓣行程成正比例关系。
2. Rod material specification regarding to the diametre of round rod. Square rod and multi-shaped rod regarding to inside diametre. 棒材规格指圆棒直径、如方棒及多角形棒指内切圆直径。