I have a question regarding electromagnetic pneumatic valves.
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The pneumatic valve cannot spring back when there is no air flow. At first, I thought it had frozen, but pouring hot water on it for a long time didn’t help either. When the spool of the solenoid valve is activated, normal intake and exhaust sounds can be heard. The handle of the pneumatic valve has been removed; it can be opened and closed manually using a wrench, but it doesn’t close on its own. What is the problem? Is the spring broken? Thank you all.
Most likely, there’s a problem with the spring; take off the cylinder and take a look to find out.
Step-by-step elimination: 1. Remove the valve; if the valve port diameter and torque are low, use a wrench to turn it to see whether it can open and close properly. 2. Try controlling the actuator on and off without installing a valve, using an electromagnetic valve instead; this will help determine whether the problem lies with the electromagnetic valve or the cylinder. 3. If none of these methods work, disassemble the actuator cylinder head to check for any damage inside.
The solenoid valve is vented; check whether there is any leakage in the actuator. No air intake sound should be heard once it operates properly. It must be the actuator that’s broken.
You can remove the solenoid valve and see if it can return to its original position; this will help determine whether the problem lies with the solenoid valve. If it still cannot return to its position, possible reasons include excessive resistance in the valve stem – this is a likely issue with ball valves or butterfly valves – as well as a broken spring. Another possibility is a problem with the sealing gasket of the cylinder. I think the first possibility is the most likely one
Check the exhaust port of the solenoid valve to see if it is blocked, or simply remove the dust cover
There is a leak in the cylinder gasket; since no new gasket is available, duct tape can be used to wrap evenly around the gasket 1 to 2 times, which will allow it to continue working for a long time. It’s also a good idea to spray some lubricant such as loosening agent at the air inlet of the solenoid valve to keep the cylinder body lubricated and reduce wear