Shuangda Hydraulic Machinery is one of the professional throttle valve manufacturers and suppliers in China, welcome to buy cheap and low price throttle check valve made in China from our factory. Usage and characteristic L high-precision throttle valve is a simple type of flow controlling valve. It is used to set precise flow of the oil, and it also has the function of stopping the high-pressure oil. LA high-precision throttle and check valve is used to make the oil fluid precisely flow, and allow the oil fluid flow inversely.