A novel proportional pressure valve based on depressurization using hydraulic half-bridge

Traditional electro-hydraulic proportional valve has begun to gradually replace the traditional servo valve with the development of electronic technology. However, the traditional proportional valve has the common disadvantages that they all have the very large weight and volume, and this may lead to the limit of its development. This paper proposed a novel proportional valve based on depressurization using hydraulic half-bridge, which has smaller weight and volume than traditional proportional valve. This paper gives the basic principle of the novel valve, and a detailed mathematical model is established. Then, the software simulation is conducted to prove the validity and feasibility of the novel valve. The frequency characteristics of the valve under different parameters are analyzed and some instructional advice on the design of the novel valve is given in this paper. Then, a physical prototype is designed and some experiments are conducted to prove the principle of the novel valve. Finally, we got a conclusion in the last part of the paper.