indicator cock造句

After a successful blow ahead and a blow astern, the indicator cocks are closed on all the cylinders, and then the engine can be started on fuel.
To further complicate matters, a large engine is usually " blown over " first with zero fuel settings and the indicator cocks open, to prove that the engine is clear of any water build up and that everything is free to turn.
It's difficult to find indicator cock in a sentence. 用indicator cock造句挺难的