Why Downstream Injectors Fail

After a few years downstreaming, i can instantly tell when one has crapped out. Yesterday i started soaping a really mildewy vinyl house with my standard mix and..... Nothing happening to the green, even i could still see soapy suds coming out. I could tell as many times before, not enough detergent was getting to the surface. So, i replaced the injector and saw immediate cleaning power difference. When i got back to the shop, i did a post mortem just to determine the problem. Spring was fine, ceramic ball was fine, oring on barb was ok, but probably gummy. But the real culprit was the cone orifice insert. It was corroded away, as many times before.



Look at the attached pic you can see the difference between the bad one and good one. In case you ever wondered why these things fail.

great pic Bob

You are exactly right. The pressure and flow I guess just eventually erode them out and it is like having a larger orifice injector. It would be cool if someone could develop a ceramic orifice.

I wonder of you can just buy replacement orifices ? Anybody know? I've never asked anyone.

You can order replacement orifices just like you can order the o-rings, steel or ceramic balls and springs.

Not all vendors will place the order, some will.

There is an area of the injector that is shaped like a cone on the outlet that might keep it from pulling chemicals when it is corroded or worn.

Looks like the internals of a super suds sucker.Tested mine today drawing 1 ounce per second through a dema valve not bad at all.

I've swamped them out before. It really doesn't take long for them to start eroding when they're new.