Design Calculation and Strength Testing of Explosion-Proof Electric Gate Valve DN300 under High Pressure in Underground Mining

Abstract

This paper presents the results of a design, calculation, and durability simulation study for a DN300 explosion-proof electric gate valve, used in drainage pumping systems in underground coal mines with harsh working conditions. The study focuses on determining optimal geometric parameters and selecting SUS 304 stainless steel material to resist corrosion in acidic water environments. Using analytical calculation combined with simulation, the authors determined the required valve disc thickness to be 110 mm and the valve cover thickness to be 12 mm to withstand a working pressure of 6.4 MPa. Simulation results show that the stress and displacement of the valve body are within permissible limits (maximum displacement 0.148 mm), ensuring reliability and explosion-proof safety according to current TCVN and QCVN standards.