A steel bottle type of test pressure loading machine in model of ZL-1/22.5-III is a third decade of improved test pressure device. Compared with early products, its main character is taking a pneumatic clamping device and a pneumatic facility for returning water to restored position (if the user want to use a manual way for claming, it can be order to make). Overcoming the every kind of the abuses in electronic way for returning water to restored position, our products have the higher equipment reliability and a more convenience for operation.