Study on the design of single-seat control valve with stable flow regulation and its fluid flow characteristics and thermal stress

Abstract

Aiming at technical problems such as unstable flow at small openings and uneven force on the valve core, the single-seat control valve with stable flow regulation is researched and designed. The tapered surface of the outer edge of the valve core can cooperate with the valve seat when the valve core is running stably, resulting in higher flow regulation accuracy and more stable regulation. The mechanical characteristics and flow characteristics are analyzed. The fluid flow simulation analyzes the pressure, velocity, density, mass flow rate and volume flow rate of the fluid under small and large openings of the single-seat control valve. The relationship between the maximum pressure, maximum velocity, maximum density, mass flow rate and volume flow rate of the inlet and outlet with the opening are analyzed from small opening to large opening and smaller opening. The spool motion simulation analyzes the relationship between actuator driving force, unbalanced force, linear displacement, velocity and acceleration with time. The thermal stress simulation analyzes the thermal temperature, resultant heat flow, thermal stress, thermal strain and safety factor, and the material strength meets the requirements. The valve body pressure test, valve seat sealing test, full stroke and switching time test, drift and jitter test, starting deviation test, basic error and return difference test and dead zone test are carried out on the single-seat control valve. The test results all meet the requirements. The simulation results are compared and analyzed with the test results, and the simulation results are consistent with the test result.