check valve for vaccum pump

[howden86]

I have a vaccum with oil reclaimer and moisture trap. It has a auto start and stop. My problem is if it shuts off all the oil goes into my moisture trap and then on the floor. How do I fix this

[Parker]

On my Massport 500 (a large pump) I have a check valve on each side of the pump head,,that way it cannot pull any vacume through it when it shuts itself off,,when it dose shut of it spins backwards about 1/2 a revolution then stops,,,,,befor I had the valves it wouls spin backwards for some time as the long line going to the releaser (and probably the rest of the tubing system) acted as a vacume resivior,,,,,