QYSZIII type double-acting hydraulic drilling jar is a new hydraulic drilling jar with locking mechanism developed on the basis of the QYSZII type double-acting hydraulic drilling jar. Besides the advantages of QYSZII type, it also has the following advantages: 

1. The mechanical locking mechanism prevents unnecessary wear of the internal parts, and extends the service life. 

2. The mechanical locking mechanism is functional safety and reliability. The locking force is linear stability.

3. The mechanical locking mechanism can avoid the failure jarring caused by improper operation to make the operation more safe and reliable.
QYSZIII type double-acting hydraulic drilling