The RV sequencing valve series is a main component forrealizing automatic control in industrial pipelines. lt is widelyused in the automatic pipelines in petroleum, chemicalindustry, pharmacy,fertilizer, electric power and etc. lt isespecially suitable for use on engineering pipelines for gaspressure swing adsorption andseparation of hydrogen,oxygen, reformed gas, FCC dry gas, shift gas and etc., and inparticular suitable for use on pipelines that require two-waysealing.