Introduce：The constant pressure drying process is to make constant pressure on the axis of the coil during the drying process, so that the insulation parts in the coil can be fully compressed during the whole drying process, thereby improving the short-circuit performance and service life of the transformer. In order to apply the hydraulic system with constant pressure, the cylinder is applied to the axial pressure of the coil. The hydraulic system can not only keep the constant pressure, but also adjust the pressure according to the needs. This equipment is mainly used for the suppression of the 110KV and above transformer coils, and the pressure is constant. It is the most ideal device for handling the coil.