Calculation of specific pressures in gate valves at the gas pressure of up to 105 MPa

Abstract

In power calculation of the valves, maximum specific pressures at the gate valves are determined only in the closed position, not taking into account decrease at the sealing fields contact area between the slide valve (wedge) and the valve seats in opening, throughput characteristic of the slide valve and working medium flow rate and density. Results are provided of calculating specific pressures at the gate of the slide valve DN 150 PN 25 MPa LLC “Scientific and Production Company “MKT-ASDM” at the gas pressure drop of up to 105 MPa depending on the slide walk stroke and taking into account the gas flow rate and density using the valve actual throughput characteristics. Specific pressures of maximum values were achieved in the slide valve relative stroke range of 0.1…0.2. It is recommended to determine the specific pressure maximum value taking into account reduction in the sealing fields contact area when the wedge is raised, throughput characteristic of the sliding gate valve and the working media flow rate and density. This should be done after calculating the specific pressure with gate valve closed according to the well-known method used in the valves’ power calculation