The rotation speed control system of mixing drum in the concrete mixer including control mode switch and manual control unit The manual control unit can control the control mode switching switch Ready Mix Concrete Plants which makes the brand switch of inserted valve and cartridge valve the inserted valve and the cartridge switch in the open state The brand circuit in the variable pump of the inserted valve and cartridge valve can connect with the hydraulic motor Henan Daswell Machinery is a professional manufacturer of construction machine for almost 30 years in China We are dedicated to supplying our customers with best service and products our major products include concrete block making machine Ready-mixed concrete batching plants If you are interested in our products please contact us freely sales daswell com mini concrete mixer quot src quot http www dwblockmakingmachine com uploads allimg 141106 2-141106134342524 jpg quot style quot border 1px solid rgb 204 204 204 padding 3px width 400px height 400px quot gt In the production process of concrete mixer types of concrete mixer oil circuit can be equipped with inserted valve and cartridge valve which is connected with magnetic valve The inserted valve is in parallel with the speed control valve which is composed of brand circuit of magnetic valve which can ensure the hydraulic oil in large flow to get through the oil circuit In the concrete mixer whether the oil circuit is smooth directly decides the normal operation of concrete mixer But in the concrete mixer how to ensure th