How to solve this problem with the valve?
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The pneumatic cut-off valve will not operate; this is the condition after it has been disassembled. How can this be resolved?
The shift fork is broken and needs to be replaced.
Working principle of the fork-type pneumatic actuator: Compressed air enters the cylinder, pushing the piston to move in a linear motion. Through the design of the piston pin and the U-shaped groove of the fork, the linear motion of the piston is converted into rotational motion of the fork. The rotation of the fork drives the output shaft to rotate, thereby enabling control of the valve. The U-shaped groove of the shift fork is broken; check whether the pressure reducing valve for the control air supply is functioning properly and whether there are any issues with the piston movement mechanism
The shift fork is broken. For safety and stability reasons, it is recommended to use a pneumatic actuator ； From a low-cost perspective, in terms of welding ； From a maintenance perspective, you need to determine the cause: is it an insufficient torque calculation, or have the operating conditions changed?
It clearly looks like something is broken. I think it’s because the movement isn’t frequent, which leads to increased torque and jamming.
With your fork broken, how can it move?