Valve on several holes and lumen, reaching down pressure self-balancing.

阀瓣有数个孔和上腔相通，达到上下压力自平衡。

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Upper and lower ends of the hydro-cylinder identity are installed upper pressure board and down pressure board, which has piston rod and connecting stick.

复合式弯辊液压缸缸体的上、下端分别装有上压板和下压板组成油缸，里面装有活塞杆和连接杆。

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From spring rigidity and range of set pressure, spring optimize design to same diameter's safety valve at set pressure near blow-down pressure are discussed.

从弹簧刚度、整定压力范围，讨论了针对安全阀同一口径，在整定压力和回座压力比较接近的情况下，弹簧的优化设计。

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They drill down to the shale, then go sideways and inject high-pressure water, sand or other material into the rock.

VOA: special.2009.10.23

Wrev w reversible. in this case here let's see this is it's a pressure is going down.

曲线下的面积，可逆过程的功,这个过程中。

麻省理工公开课 - 热力学与动力学课程节选

So the force that you're pushing down on here is the external pressure times the area.

或者压缩功的概念,在活塞上施加压力。

麻省理工公开课 - 热力学与动力学课程节选

Like BP, integrated European oil supermajors Total S.A. and Royal Dutch Shell have been weighted down under the pressure, down 16.5 percent and 12 percent, respectively.

FORBES: Deepwater Euro Mess: Don't Touch BP, Call The COP

Wallace forced another save with yet another long-range strike and Parkin went down under pressure while chasing the rebound but Preston's penalty appeals were turned down.

BBC: Preston 1-5 Tottenham

However, with the pump shut down a pressure increase was seen in the standpipe (SPP).

WSJ: The Oil Disaster Is About Human, Not System, Failure