piston valve

基本解釋

Keep the F. O piston valve open not in excess of 10 seconds max.
保持燃油活塞閥開狀態(tài)最多不超過10秒。
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Make sure of the pilot burner ignition and open the F. O piston valve for main burner light off.
確認點火燃燒器點火，打開燃油活塞閥停主燃燒器點火。
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To avoid these two kinds of noise, the paper gived some requirements to the internal structure design of shock absorber, such as piston valve system, bottom valve system, piston rod etc.
爲降低或消除這兩種減振器噪聲，提出了對減振器內部結搆如活塞閥系統(tǒng)、底閥系統(tǒng)以及活塞桿等的設計要求。

All it means is that the Piston is not the Steam Box that Valve plans to release.
FORBES: Xi3 Is Committed to Piston, While Valve's Steam Box Remains Elusive