【2025 Engineering Applications】Method for replacing the fault position (FO/FC) of single-acting pneumatic on/off valve cylinders
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In many cases, it is necessary to adjust the fault position (FO/FC) of pneumatic on/off valves due to various reasons such as process requirements or incorrect selection. The diagram below shows the basic structure of a cylinder.
This post was last edited by zhoudingshengs on 2025-7-7 08:06. 1. The cylinder fault status is off.
2. Remove the bolts on both sides of the cylinder and take off the side covers on each side.
3. Remove the spring and place it carefully to avoid damage or loss.
4. Loosen the stroke screws for opening and closing the cylinder to the fullest extent.
5. Remove the cylinder teeth, being careful not to damage the sealing ring indicated by the arrow.
7. Pay attention to the cylinder angle; it is approximately 30° where the arrow points.
8. Push the tooth rows evenly to the appropriate position. Note: After pushing the tooth rows all the way down, the gear shaft should be horizontal relative to the cylinder, and the distance from the edge of the cylinder to the tooth rows on both sides should be the same. The right arrow points to the edge of the cylinder.
9. Adjust the bolt for the full open stroke of the cylinder.
10. Set the cylinder to full close, then adjust the full-close travel bolt.