We are a professional manufacturer of valves. You are always welcome to consult us. Product Description: ​ 1. It is installed in the cab and remotely controlled. ​2. The valve has four working positions: lifting, intermediate stop, descending and slow lowering. ​3. The valve has beautiful appearance, self-locking of middle stop position, clear transposition and simple operation. ​ 4. It can realize the fast and slow control of descending action by cooperating with the slow descending pneumatic directional valve. ​ ​Product advantages: ​1. The quality is stable and the consistency between products is good. ​2. The manufacturer supplies and the output is guaranteed. ​ 3. The product is widely used in the hydraulic system of dump truck with good versatility. ​ 4. The product is easy to install and maintain.