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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.
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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