The machine is powered by hydraulic pressure to drive the clamping cylinder, the turnover of the left working plate, the movement of the left working table, the rotation of the torque wrench claw, the movement of the column of the torque wrench system, the lifting of the beam and the rotation of the torque wrench claw oil motor. The high-pressure oil is generated by the pneumatic high-pressure pump (maximator pneumatic pump), the low-pressure water is generated by the low-pressure water pump, and the high-pressure water is generated by the pneumatic high-pressure pump (maximator pneumatic pump imported from Germany), which can automatically compensate the pressure (optional by the operator). The control of the whole system is realized by touch screen, PLC automatic control system and electrical system.

The three locating claws on the left and right working plates can move synchronously in the radial direction, clamp and relax synchronously in the axial direction, and the left working plate can be turned over within the range of 0 ~ 90 ° to check the air seal test and the sealing of the valve seat. The left workbench can be moved left and right to adapt to different valve face-to-face dimensions.

The valve opening and closing torque output device is composed of column and column horizontal moving device, beam and beam lifting device, oil motor, universal joint, connecting rod and torque sensor. Adjust the horizontal position of the column and the position of the beam so that the torque wrench claw is aligned with the center of the valve handwheel. When the torque output device opens and closes the valve, the oil motor generates torque. Through the torque sensor, universal joint and connecting rod, the wrench claw drives the valve to open and close. The torque value is transmitted to the touch screen and PLC automatic control system. When the torque value reaches the set value, the system sends a command and the oil motor stops immediately, Thus, the opening and closing operation of the valve can be realized according to the set torque.

Main functions of test bench:

1. The touch screen system automatically sets the valve test standard parameters according to the nominal diameter and pressure of the valve (the test parameters can be set manually);

2. Carry out back seal test, shell strength test and high and low pressure seal test;

3. Cycle procedure of automatic valve life test: pressurize the seal valve channel, close the pressure valve according to the set torque, release the pressure on one side of the pressure valve, and set the pressure to open the seal valve channel (repeatedly set the cycle test number). When the cycle test reaches the set number, the cycle test is completed.

4. If the valve is an electric driving device, connect the electric driving device with the equipment line, and the system will control the electric driving device to open and close the valve according to the cycle program;

5. The touch screen and PLC automatic control system can record the valve name, model, inspector number, test standard, test date, inspection number, test medium, test pressure, pressure holding time, life test number, valve opening and closing torque and other parameters, and can record the test pressure and pressure holding time of valve sealing test, shell strength test High pressure seal test adopts digital curve and graphic curve in the system. The data saved in the system can be printed according to keywords, which provides conditions for the quality of subsequent return. The test data can be exported to customer Excel for ERP management.

Valve opening and closing torque testing:

1. Lift the valve to a proper position, adjust the horizontal position of the column and beam of the torque output device, and align the torque wrench claw with the center of the valve handwheel;

2. discharge the air in the valve body and pressurize the test medium to the specified value;

3. Pre close the valve with small torque; Open the left discharge valve and empty the left cavity of the valve. At this time, the sealing pressure difference of the valve is full pressure, which may cause large leakage, and the system will automatically compensate the pressure of the test medium;

4. move the workbench to the left, press the "oil motor torque amplification" button, and observe the valve leakage. When the valve leakage meets the standard, the torque value recorded by the touch screen and PLC automatic control system is the closing torque value of this test;

5. Repeat the test for the closing torque value for three times, and select the maximum value as the valve closing torque value;

6. when the above closing torque test is carried out, the valve opening torque test can be carried out at the same time, that is, under the condition of full differential pressure, increase the valve opening torque until the valve is opened. The torque value recorded in the touch screen and PLC automatic control system is the opening torque value. Repeat the torque value test three times, and select the maximum value as the valve opening torque value.