differential pressure control valve meaning in English

差压调节阀
差压控制阀

Application of self - operated differential pressure controlling valve
自力式压力调节阀的特点及应用
The effect of return oil pressure on hydraulic system with differential pressure control valve
回油压力对具有差压式配压阀的液压系统的影响
Development and application of the differential pressure control valve of self - force type in the circulating compressor
自力式差压控制阀的研制及在循环压缩机上的应用