采用大小适中的扳手，松开止回阀盖。旋下止回阀盖螺丝并拿起。
Using an appropriate sized wrench, loosen the check valve cover. Unscrew the check valve cover and lift off.
测试端口应该内置止回阀并配置阀盖。
Test ports shall have internal check valve and be equipped with caps.
采用尺寸大小适中的扳手松开止回阀阀盖。宁松止回阀阀盖并将其取出来。
Using an appropriate sized wrench, loosen the check valve cover. Unscrew the check valve cover and lift it off.
第一止回阀总成O形环，阀瓣固定器总成，阀盖O形环和感应通道O形环。
First check assembly O-ring, Disc holder assembly, Cover O-ring and Sensing passage O-ring.
阀体、阀盖、附属件和控制止回阀均符合美国材料试验协会ASTM的半红铜合金分类标准。
Valve Body, Cover, Tailpiece and Control Stop shall be in conformance with ASTM Alloy Classification for Semi-Red Brass.
阀体、阀盖、附属件和控制止回阀均符合美国材料试验协会ASTM的半红铜合金分类标准。
Valve Body, Cover, Tailpiece and Control Stop shall be in conformance with ASTM Alloy Classification for Semi-Red Brass.
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