Multiple functions performed by a single valve can result in added system protection and lower cost to the user.

多种性能集成在一个阀门上使得系统得到更多的保护，也降低了用户的成本。

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The math model of a single valve system is established on the basis of Newton's second law of motion and pressure dynamics.

本文在牛顿第二定律和压力动力学基础上建立了单气门系统的数学模型。

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The result shows that superfluous force is less in double valve parallel control system than that in single valve control system, and the precision of dynamic loading is increased.

仿真和实验结果表明：加载系统采用双阀并联控制比单阀控制的多余力明显减小，动态加载精度明显提高。

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Within hours, SpaceX officials identified the culprit as a single defective valve, and were able to replace the part because it was easily accessible.

WSJ: SpaceX Acts Fast for New Launch

It's an overhead valve engine with a single camshaft that uses push rods to open and close the 16 valves.

FORBES: The Engine That Could

While the goal of the initiative is to move PC gaming from the desk to the living room, that doesn't necessarily involve a single hardware standard or minimum spec, Valve hardware engineer Jeff Keyzer told Engadget in an interview this morning at CES 2013.

ENGADGET