In winter, If there is water in the valve when the temperature below 0 ° C it will cause the problem of frost cracking, Even if there is only a few hours below zero temperature in a day. So, how to drain the remaining water in the pump valve?

1. Open the 45-80 degree self-flow valve to ensure that the remaining water in the tank is drained and keep the valve opening angle unchanged; or open the water outlet valve and start the water pump to pump out the remaining water in the tank.

2. Open all ball valves (including all water outlet valves and return water valves); open the electrical control switches of front spray, rear spray, side spray in the center console of the cab; open all pipelines of the water nozzle at the bottom of the pump until the all residual water in the tank is discharged.

3. In order to avoid water in the valve, all manual ball valves are closed and opened again after all the remaining water in the tank and pipeline is discharged, open the electrical control switches of front spray, rear spray, side spray in the center console of the cab once again and keep it in the open position, then adjust the air pressure button on the pneumatic control box, and turn it counterclockwise to adjust the pressure to zero. At this time, the pneumatic ball valve will remain open.