If the medium flowing in from the upper part of the gobe valve disc may cause the valve disc to detach from the valve stem, or cause a component to fall from the valve disc, the medium flow direction must be designated to flow in from the lower part of the globe valve plate. One advantage of media flowing in from under the valve disc is that the stuffing box can relieve the upstream media pressure after the valve is closed. If the medium to be cut off is a hot medium, such as steam, the thermal contraction of the globe valve stem is likely to cause seal leakage after the valve is closed. If the medium flows in from above the valve disc, the force of the medium acting on the upper part of the valve disc will increase the closing force of the valve stem. Therefore, the flow direction of the medium greatly increases the reliability of the valve seal. sex. But when the valve is open. Inflow from the top will greatly increase the opening torque of the valve.
