Through application of frequency converter in constant pressure water supply system, the paper describes the economic feature and advantages of adopting AC frequency conversion speed control method.

通过变频器在恒压供水系统中的应用，阐述了采用交流变频调速控制方案的经济性和优越性。

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The cranes feature a redeveloped control valve that is said to reduce pressure peaks to improve service life and reduced deadweight.

这些型号起重机与众不同之处在于应用了据说可以减少峰值压力、降低重负、提高使用寿命的经过改进的控制阀。

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