When the solenoid is de-energised, the pilot orifice closes and full line pressure is applied to the top of the diaphragm through a bleed orifice.

当螺线管德通电，飞行员口关闭并全线压力作用于出血口通过对膜片的顶部。

youdao

The plane routinely flies at altitudes over 70, 000 feet, requiring the pilot to wear a full pressure suit, much like an astronaut.

WSJ: Cold War U-2 Pilot Francis Gary Powers to Receive Silver Star