Research on Simulation and Verification of Flow Characteristics of Three-Way Control Valve Under High and Low Pressure Conditions

Aiming at the problem of lack of numerical simulation research and test conditions for the flow coefficient of the main bypass circuit of the three-way control valve under the high pressure actual working conditions, taking the DN250 three-way control valve as the research object, a method to modify the flow coefficient under low-pressure test conditions to obtain the flow coefficient under high-pressure actual working conditions is proposed. CFD method is used to simulate and study the flow characteristics of the main control circuit and bypass circuit of the three-way control valve under low-pressure and high-pressure conditions under 10% ∼ 100% typical opening, calculate the corresponding flow coefficient kV, and correct the test flow coefficient under low-pressure test conditions according to the proposed correction conversion relationship of flow coefficient under high-pressure and low-pressure conditions, so as to obtain the flow coefficient under high-pressure actual conditions, which is verified by experiments. The results show that the trend of the corrected flow coefficient curve under high pressure condition is consistent with the test flow coefficient curve, and the average error between the corrected flow coefficient and the test is less than 3%, which proves that the correction method has good accuracy and can be used to predict the flow coefficient under high pressure actual condition.