closure test meaning in Chinese

弹簧压缩试验

Demineralized water ? when specified for special valves , demineralized water may be used for cleaning and hydrostatic shell and closure testing
软化水?对于特殊阀门，如果用户指定，可以采用软化水进行清洗和流体静力学壳体和弹簧压缩检测。
Kerosene testing ? when specified for special service valves , pacific valves can perform hydrostatic shell and seat closure testing using kerosene in lieu of water
煤油检测?对于特殊应用的阀门，如果用户指定，美国太平洋阀门可以采用煤油代替水对阀门进行流体静力学壳体和阀座压缩检测。