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 Henan Daswell Machinery is a professional manufacturer of mining machine for almost 30 years in China. We are dedicated to supplying our customers with best service and products, our major products include:mobile ready mixed concrete plant,mobile block making machine,double horizontal axles forced concrete mixer,If you are interested in our products, please contact us freely: sales@daswell.com In the concrete mixer, whether the oil circuit is smooth directly decides the normal operation of concrete mixer. But in the concrete mixer portable concrete batch plant, how to ensure the oil circuit smooth of concrete mixer for users?   In the production process of concrete mixer sicoma twin shaft 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. 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, 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.   Manual control unit concludes spring and hand shank on the other end of movable connecting rod. The control mode switching switch is composed of contact block and travel switch, which is fixed between the spring on the contact block of connecting rod and travel switch.