The characteristics of the YDC type hydraulic stressing jack are as follows:
1. The new type of sealing member is adopted to make the sealing strength of the sealing member synchronously increase when the cylinder body is subjected to high pressure;
2. The special alloy steel cylinder material is combined with the heat treatment process to reduce the expansion ratio of the cylinder during the tensioning process, so that the life and sealing performance of the seal is improved by about 20%;
3. For the tension operation process, the jack return overpressure is easy to damage the jack. The overpressure protection valve is added to the jack for pressure relief protection; at the same time, several commonly used models adopt the wire disc type and the flange type structure. Improvements have been made to increase the bearing capacity of the jack against the return hydraulic pressure, greatly reducing the possibility of damage to the jack due to improper operation.
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