Chengli Special Purpose Automobile Co., Ltd. manufactures water sprinkler trucks based on high-quality domestic and imported Type II chassis. These vehicles are suitable for road watering, misting, cooling, dust suppression, and cleaning of dust and debris. They can also be used for road maintenance, landscape greening, emergency firefighting, and potable water transportation. The sprinkler truck mainly consists of a vehicle chassis, tank body, water pump, ball valves, water delivery piping, and sprinkling equipment. The water pump, power take-off (PTO) gearbox, and ball valves are all nationally standardized products—offering excellent performance, reliable operation, high pressure, large flow rate, and low fuel consumption during watering operations. A musical horn switch is provided; activating it plays pleasant music to accompany your work. I. Working Principle and Structural Overview 1. Structural Schematic Diagram of the Sprinkler Truck Figure 2-1: Structural Schematic Diagram of the Sprinkler Truck 2. Vehicle Chassis This sprinkler truck is modified from standardized Type II chassis supplied by Dongfeng Motor Corporation and FAW Group Corporation. Specific structural details of the Type II chassis used in each unit are provided in the attached “Chassis User Manual.” 3. Tank Body The tank body is elliptical or rectangular in shape, fabricated from steel plates. The entire tank comprises 2–3 separate compartments, with perforated baffles at the bottom between compartments to minimize liquid surge during vehicle motion. The exterior surface is coated with anti-rust primer and decorative paint. Figure 2-2: Water Tank (1) Dome head (2) Upper guardrail (3) Fill opening (4) Access ladder (5) Lifting lugs (6) Support brackets (7) Sub-frame beams (8) Cylindrical shell (9) Nozzle assembly (10) Surge-suppression baffle (11) Level gauge To prevent corrosion, the tank exterior is coated with anti-rust and decorative paint. A level indicator is mounted centrally on the tank side wall, enabling direct reading of the internal volume during filling or discharging operations. 4. Fill Opening Assembly Figure 2-3: Fill Opening (1) Handle (2) Small cover (3) Large cover (4) Pivot pin The large cover is bolted securely onto the fill neck plate. It is connected to the small cover via a pivot pin and protective plate. Rotating the handle clockwise presses the small cover tightly against the opening; rotating counterclockwise disengages the ear plate, allowing the small cover to open. A Φ30 mm vent hole is provided in the large cover to equalize internal tank pressure with atmospheric pressure during filling. 5. Power Take-Off (PTO) A dedicated PTO unit matched to the specific chassis model is employed—operated either pneumatically or manually. Pulling the control lever rearward engages the PTO; the drive shaft then powers the water pump. Pushing the lever forward disengages the PTO, stopping pump operation. 6. Water Pump The sprinkler truck uses a self-priming centrifugal pump specifically designed for such applications. Detailed structural diagrams, operating instructions, and maintenance guidelines are provided in the “Water Pump User Manual.” 7. Ball Valves The vehicle employs spherical ball valves. Each valve consists of a valve body, adjustment seat, sealing ring, spherical closure element, valve stem, and handle. A 90° rotation of the handle fully opens or closes the valve. Valve tightness can be fine-tuned by adjusting the sealing preload. The sprinkler truck is equipped with seven Φ50 stainless-steel ball valves for precise water flow regulation. Additionally, one Φ50 aluminum-alloy ball valve (labeled as No. 4 in the diagram) controls suction (intake) or discharge (sprinkling) functions—opened during suction operation.