Static characteristics of four-way jet-pipe valve

Abstract

Mechanism of four-way jet-pipe valve is analyzed in detail by dividing the entire process into two stage, including stream jetting and stream receiving processes. Mathematical model of the whole working process of four-way jet-pipe valve is obtained based on the Bernoulli's equation. Receiving area of symmetric receivers varying along the jet nozzle deflection is deduced according to geometry. By theoretical analysis and mathematical calculation, pressure recovery increases with the increase of receiving area. On the basis of a fixed distance of 0.4 mm between the nozzle and receivers, 1) in the condition of radius of the jet nozzle is equal to that of receivers, pressure recovery at null position is 64.5% of the supply pressure; 2) in the condition of radius of jet nozzle is smaller than that of receivers, pressure recovery at null position is lower than 64.5% of the supply pressure; 3) in the condition of radius of jet nozzle is lager than that of receivers, pressure recovery at null position is higher than 64.5% of the supply pressure, and it moves high along with the radius gap. Even if the jet nozzle moves to the max deflection position, pressure recovery at receivers is higher than back pressure of return oil. The highest pressure gain of loading pressure can be obtained at the situation of radius of the jet nozzle is equal to that of receivers. The theoretical results' tendency is basically in agreement with the experimental results.