Heat System for Rigid Wedge Valves

Abstract

The authors consider the problems of electromagnetic, thermal, and hydraulic processes during heating of the valve with liquid to eliminate jamming. This effect is characteristic of rigid wedge valves with a decrease in ambient temperature. Heating the valve body is used to eliminate jamming. The use of induction heaters allows for local heating with a specified intensity. This heating method does not require a tight fit of the heater to the valve body. The power and location of heart source are determined taking into account the limitations of the maximum value of the liquid temperature. Overheating can lead to vaporization and increased pressure. The analysis of convective flow in the inside cavity of valve body showed the mixing processes near lower surface of wedge are less intense and limited by a small volume. The movement of fluid at the side walls occurs along the entire height of the valve body. This difference leads to local overheating of liquid in the lower areas. In designing of the induction heater, the localization of heating zones is provided. This is necessary to prevent eddy currents in the areas of the housing where overheating is dangerous. In the design of the inductor, the cup-shaped magnetic core is made of ferrite to reduce the magnetic dispersion field and increase power factor. The lateral protrusions of the magnetic core limit the area with eddy currents.