Seeking expert help: how can a quick-acting pneumatic on/off valve be modified into a slow-closing valve?
Thread Content
Our company has a 4-inch pneumatic butterfly valve. It’s that the solenoid valve opens when powered. Compressed air (decompressed to 5 KG) enters the cylinder, causing the valve to close rapidly as a result of the cylinder’s movement. When the solenoid valve loses power, the cylinder acts to quickly open the valve. The cylinder is bread-shaped, with FO function. My question is: what is the simplest way to modify the system so that, once the solenoid is powered, the cylinder closes more slowly? It would be ideal if the valve core rotated slowly as it closed, with the process taking 1 to 2 minutes. Now it shuts off in an instant; the water hammer vibration in the pipes is too severe. Seeking advice from experts, thanks! Is it possible to add a throttle valve to the air supply, or are there cylinders with a slow-close function? Thank you! It would be best to be more detailed, recommending specific product names, models, contact information, etc.
The first statement is incorrect; it should be that the solenoid valve closes when powered.
Replace the electric butterfly valve, or install a small shut-off valve in the air pipeline to reduce the amount of compressed air
Is there a filter-regulator valve at the air supply inlet of the valve? It can be used to reduce the inlet pressure; if it’s currently set at 5 KG, you can try lowering it to 3 KG. Alternatively, a flow regulator can be installed at the outlet of the solenoid valve
The air supply inlet is equipped with a pressure relief valve; after adjusting the pressure to a lower level, the valve seems to operate weakly, moving in a hesitant manner and not smoothly.
Based on the poster’s requirements, I personally think a device that meets the specifications should be replaced, as modifying the existing device is rather difficult.
Well, then install a speed control valve at the air outlet of the solenoid valve; they’re available in stores that sell pneumatic components, as well as online
Pneumatic valves can adjust the speed of air intake and exhaust in the cylinder, thereby controlling the opening and closing speed of the valve
The simplest solution is to adjust the pressure valve to reduce the pressure from 5 kg; the exact amount required needs to be determined through on-site testing
Generally, when selecting valves, the torque of the actuator is calculated based on a minimum air supply pressure of 4 kilograms. If the air supply pressure is reduced to 3 kilograms and the valve does not open or close properly, it is likely that the torque of the actuator is insufficient. Just my humble opinion