Any small 3-way spool type valve, single pilot operated, spring return would work for your application. Use a 3-way Palm Button air valve to pilot it for a simple setup.Realize the flow of an air valve using vacuum will be much lower than advertis
What type of flow requirement do you have? Do you want a manual valve, or solenoid operated? Parker has an extensive vacuum line, as well as valves and air preparation.www.parker.com/pneumatic