POLAND_SPUD wrote:it could be achieved using pressure area differential but I think there is a spring there... in the vid you can see that it returns to original position even when not under pressure so there must be a spring
But if all the portings (nipple inner diameters) are the same then there is no pressure differential because their areas are equal, right? I don't see a spring in the video on the front end where you push so if there is indeed a spring it must be somewhere else like housed in the additional coupling on the rear in the video.
Can you confirm that there is a spring in use here?
I'd like to put together a small one of these myself and I'd like it to spring return, but I'm trying to decide whether it would be easier to accomplish this with pressure area differential like POLAND said or just simply by using a spring. When using fitting like this (nipples with a standard ID) it seems like it may be easier to construct a balanced valve first, then add a spring, rather than modify the ID of one of the nipples. However, adding a spring just means another part that I'll have to find.