主汽阀 meaning in Chinese

main steam valve
overspeed valve
steam-outlet valve

There should be a main valve between mother tube boiler and steam mother tube , which should be in remote control
6母管制机组的锅炉与蒸汽母管之间应有主汽阀，主汽阀要实现远方控制。
The serious troubles may be take place when the fouling is generated on main vapor valves , monitor valves and the valve
若主汽阀、调节阀以及抽汽逆止阀的阀杆上结垢引起卡涩，还可能导致汽轮机发生严重事故。