The valve adopts sleeve oriented and pressure balanced spool. Compared with the single seat valve, the regulating valve is a sleeve double seal structure is mainly used in the case of low leakage requirements, because the two sealing surfaces of the double seal structure are metal seals, so the temperature range is wider. The spool uses the pressure balance structure, the opening and closing force is small, and the high pressure difference can be controlled by the small actuator thrust. It is widely used in the fluid control of low-temperature and low-pressure pipelines requiring good dynamic stability. Good sealing performance, large allowable pressure difference. Sleeve guide, large guide area, good stability, compact structure, can quickly replace the valve internal parts online, high maintenance efficiency, saving manpower and time. The balanced spool structure ensures that the required actuator thrust is minimal.