Remove through access port with back of clapper first with spring end down.

首先通过检修口拆卸阀瓣的后面及其弹簧末端.

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Think about getting the rear end down like you're sitting in a chair.

想想把后面终点下降像你坐在一张椅子中一般.

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After ring geometry ( Type A ) changing , it results in less end down and long service life.

改进型 A型钢领对截面几何形状作了改进,有利于降低断头,延长钢领使用寿命.

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