valve seat shaft（阀座轴）是什么意思？音标发音+图解场景

阀座轴 /ˈvalv ˈsiːt ˈʃaft/ n

English: valve seat shaft · 阀座轴

释义：Watertight device into which the tank ball is inserted to allow the tank to refill.

这个词出现在以下图解场景（1）