Size of the air supply pipeline for pneumatic valves
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Different actuator types have varying sizes for the interfaces before the pressure reducing valve; these sizes include Φ8, Φ10, Φ12, Φ20, and other specifications. If a Φ12 interface is required but a Φ8 air supply pipe is actually used, what impact will this have on the operation of the valve? If it must be connected in this way, is there any way to eliminate or reduce the impact on the valve’s operation?
If the air supply volume is too low, it is not possible to drive the actuator, which may result in the valve’s opening degree or speed not reaching the desired levels, thereby affecting the proper functioning of the valve. This is especially true for on/off valves with interlocks; an insufficient air supply volume is unacceptable, and it is necessary to replace the size of the air supply pipeline
1 Impact: The speed of movement slows down, and it may not even reach full open. 2 If it has to be done this way, install an accelerator.
I’ve studied it; I also researched this issue on-site some time ago. :)
Try adding an amplifier; it should work, but it’s necessary to adjust it properly to avoid valve oscillation or overshoot
The speed at which valves can be opened and closed is affected, especially in the case of valves for which specific opening/closing speeds are required. If the pipeline is too narrow, it isn’t possible to fill the cylinder within the specified time; what was originally required to be done in 3 seconds might now take 8 seconds, so this needs to be taken into consideration carefully
1. Our company has dozens of valves, and using 6 or 8 air supply pipes has not caused any noticeable issues. 2. Bend the 6 small tubes well. 3. If it is proven that 6 are not sufficient, use 8 or more. There’s no need to discuss this in detail or conduct calculations and proofs: if it doesn’t work, just change it. 4. Some valves of poor quality have high resistance, which can cause slow operation. In principle, this is not related to the size of the air supply pipe, but it can be compensated for by increasing the pipe diameter. 5. Increase the pressure of the air supply after the pressure reducing valve.
If there are no high requirements regarding the valve’s operating speed, it doesn’t matter; it’s not necessary to connect it in that way, and replacing it with a pipe of larger diameter is also not complicated.
It depends on the type of actuator you use. If it’s a double-acting actuator, the valve will open more slowly. Unless the valve body features a high-quality triple-eccentric seal, it should be able to open normally. However, if the valve gets stuck and is difficult to open at first, it might not open at all – this is something I’ve experienced firsthand. A single-acting cylinder with a spring inside is actually just a bit slower
I don’t understand; what’s the problem with using 8? Wasn’t that specified in the design phase? Are there no requirements for the ordering process?