Discussion on cylinder leakage issues
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Our company has used a batch of valves from a certain manufacturer; these valves are equipped with single-acting spring-return cylinders. During use, the valves failed to operate on several occasions. Upon inspection, it was found that the cylinders were leaking air. When the cylinders were opened, rust was detected on their inner surfaces. After grinding those areas and replacing the O-rings, the valves started working properly. We hope that everyone can work together to identify the problems and improve our performance as a whole
How long has the valve been in use? It might be a quality issue; or perhaps there is some leakage in the cylinder, which causes freezing when the temperature drops, leading to the cylinder getting stuck or the grease inside solidifying
The interior of a cylinder-type control valve should be very smooth, and it’s advisable to use butter for lubrication. If it rusts, it indicates that the quality of the valve is poor, and it will break down again in little time.
I’ve been using it for about 4 months; I’ll share the specific reasons with you in a couple of days. Feel free to share your opinions
After communicating with the manufacturer, it was decided that the cylinder would be made of ordinary carbon steel. In single-acting cylinders, one end is sealed by an O-ring, while the end with the spring is not as well-sealed. During the early stages of construction, the contractors left the valves outdoors for extended periods, which allowed water to enter the cylinders. Over time, rust formed on the inner surfaces of the cylinders, resulting in damage to the O-rings. Therefore, proper storage of valves is extremely important during construction management. The cylinder is just one component; other pneumatic components such as positioners and solenoid valves are also prone to damage during storage
If carbon steel is cast, it is more prone to sand holes; if air leaks through these sand holes, it becomes even harder to resolve the issue； Therefore, the material selection for cylinders is very important, and there are significant differences between forging and casting ； Water can seep into the cylinder from the outside; it seems this valve isn’t very good either ； It is understandable if the moisture in the instrument air affects the interior of the valve. Other external water intakes are really unacceptable. What brand is it?