"Zener" style check valve

[Vidaman]

Is anyone aware of a miniature check valve that has an adjustable breakdown pressure for reverse flow? By that, I mean a check valve that functions like a zener diode and would fit on .25" OD rubber/plastic tubing.

I've had no luck finding this amongst the small pneumatic equipment suppliers I'm used to dealing with.

Thanks,

Vidaman

 

[rbcoulter]

I'm not sure if I know what you want, but I believe that these are usually called flow limiters. They allow flow up to a certain point and then slam shut.

 

[ve7brz]

I'm far more versed in hydraulics than pneumatics but it seem what you're looking for is an adjustable relief valve referenced to absolute (or atmospheric) pressure.