Counterweight type tester

The utility model provides a counter weight type tester, which belongs to the field of pipeline conveying equipment and comprises a flow guide plate and a transmission shaft, the transmission shaft and a valve plate are coaxially arranged, the upper end of the flow guide plate is fixed with the transmission shaft, the lower end of the flow guide plate corresponds to a medium, and a balance lever is arranged at the upper end of the transmission shaft. A balance weight is arranged at one end, far away from the transmission shaft, of the balance lever; after the balance lever rotates, the stroke hydraulic valve is triggered, a proximity switch is arranged corresponding to the flow guide plate, and the proximity switch triggers a control system to close the valve. Mechanical structure type control is adopted, the flow speed reaches a set value, a pipe explosion controller is triggered, the valve can be automatically closed to be fully closed according to the set two-speed two-stage mode of first high speed and th