Why Shouldn鈥檛 a Shuttle Valve Be Used as a Pressure Selector?
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In this Tech Tip video, Product Manager Scott Lamb explains how shuttle valves work and why they should not be used as pressure selectors.
Video filmed at 星城web in Cincinnati, Ohio
VIDEO TRANSCRIPT:
Hi there, Scott Lamb, product manager for control valves with 星城web. Today we鈥檙e going to talk about and why they should not be used as pressure selectors.
I know鈥攎echanically, it should work just fine. And, because of the cost of other solutions, it鈥檚 tempting to use. I get it. But you have to understand what it鈥檚 not intended to do. It is not intended to be a pressure selector, or a selector of any kind. A shuttle valve is commonly called an 鈥渙r鈥 valve. It鈥檚 intended to have one input at a time鈥攏ot two inputs at the same time. So, why won鈥檛 it work?
A shuttle valve has no mechanical advantage. It must have one input on one side or an input on the other side. Yes, at some point, you get a higher pressure to overcome the lower pressure, but you do risk the poppet hanging up in the middle and allowing both pressures to enter the outlet port.
If you want a well-designed system, use a manual or a mechanical valve that is intended to select pressures and be repeatable every time.
If you have any shuttle valve questions or problems, give us a call. Thanks for watching. Please for more awesome pneumatic content.
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