primary valve pin 充油阀顶针
primary valve lever 充油阀杆
primary valve prolapse 原发性瓣膜脱垂
primary throttle valve 主节流阀 ; 初次节流阀
Primary intake valve 低压电路
primary pilot valve 调速器主滑阀
primary steam safety valve 一次蒸汽安全阀
primary steam isolation valve 一次蒸汽隔离阀
converter primary regulator valve 变矩器初级调节器阀
7 hr 30 min Even after operators pump water into the primary loop, pressure is still high. The PORV 'backup valve is opened to lower the pressure.
7小时30分钟尽管操作员已将水抽入主回路，但温度仍然很高。减压阀的备用阀门被打开，减少压力。
The metal diaphragms act as the seal at the top of the valve. The primary improvement in this generation of valves is the elimination of the spring used to open the valve.
金属横膈膜在阀门的顶部作为密封。这一代阀门的主要的改进是取消了用于开启阀门的弹簧。
Primary uses for wrot brass are for ball valve stems and balls, and iron valve stems. a forging grade of brass is used in ball valve bodies and pieces.
黄铜的主要用途是球阀阀杆和球体，和铸铁阀门的阀杆。可锻黄铜可用于球阀阀体和断口部件。
应用推荐