Research On All Plastic Watering Valve

With the development of hydraulic technology, hydraulics has been applied widely in many industry fields as an automatic control means. The various valves are also studied with the development of hydraulics. In order to satisfy some special industry requirements, the new types of valves are studied and applied with new material, new structures and new functions. The watering valve presented in this paper is researched for the water supplement of lead-acid batteries. The valve is one kind of autocontrol components, which has sensitive response, accurate control and steady function.Domestic and foreign research of plastic valves and watering system are generalized, and the difficulties to develop the valve and watering system are discussed. The watering valve is designed based on it. Because of acidity and high temperature work condition, the watering valve is made of acid-resistant and high temperature resistant material. The valve should stop watering automatically when the water supplement is enough. The upward force which the liquid acts on the pontoon, pushes down the valve core until the orifice is closed by the lever which connects the pontoon and valve core.Through numerical 3D simulation research for all plastic watering valve with CFD (Computational Fluid Dynamics) software FLUENT, the pressure field and velocity field of the flow inside the valve were mastered while the valve was working. Figured out the value of counterbalance and hydrodynamic force acting on the valve core according to the result of simulation research, and the two different structure formations were analyzed and compared, sequentially supplied the basis for the suitable design of the valve structure.The mathematical model describing the characteristics of the valve is established based on Orifice Flow Equation and Poppet Balance Equation. Computer numerical simulation is introduced to analyze the characteristics of the valve, and the structure parameters influencing the characteristics of the valve are discussed. The investigation provides the support for parameter design of the valve.Finally, four samples of watering valves are manufactured, and a watering test system is established and the watering function of each single watering valve is tested. A watering system is built with the four watering valves designed, it's function is tested with the same experiment system.