To address the challenges posed by high-temperature operating conditions (such as material performance degradation, thermal expansion, and thermal shock), high-temperature control valves employ various specialized structural designs. Heat dissipation and cooling structures utilize extended valve covers, added heat sinks, or water-cooled jacketed valve bodies to reduce the temperature of the stuffing box and actuator, protecting critical components.
Thermal expansion compensation structures employ valve stem expansion joints, bellows seals, and other designs to compensate for the displacement difference between the valve stem and valve body caused by their different coefficients of thermal expansion, preventing jamming and leakage. Thermal shock resistance and anti-jamming designs employ gradually changing flow channels to reduce thermal stress concentration; and floating connections between the valve stem and valve core are used to avoid jamming of moving parts due to thermal expansion. To address high-temperature creep and clearance variations, appropriate margins are reserved in the design of guide clearance and valve plate rotation clearance, or special structures (such as cage/sleeve guides) are used to maintain stable operation.
Based on the valve core's actuation method and structural characteristics, common types of high-temperature control valves include high-temperature angle control valves, high-temperature cage (sleeve) control valves, high-temperature butterfly valves, and high-temperature ball valves. Among them, cage-type structures and pressure-balanced valve plug structures are widely used under high temperature and high pressure differential conditions. The high temperature cage-type (sleeve) regulating valve adopts a cage-type sleeve guide and single-seat sealing structure, which features stable operation, large allowable differential pressure, accurate flow characteristics, and low noise.