All of these are normally closed valves, except for reducing valves, which are normally open.
所有这些都是正常关闭阀,除减少阀门,一般开。
Valve types include Normally Open and Normally Closed valves, for use in fuel, hydraulic, or pneumatic applications.
阀门有常开和常闭两种,可用于燃油,液压或气动应用领域。
Ukraine says it had been forced to use reserves to maintain the pressure needed to move gas to European consumers before the valves were closed.
乌克兰说,他们被迫动用天然气储备来维持管道阀门被关闭前向欧洲的顾客运送天然气所必需的压力。
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