Another pneumatic valve trouble

When I just brought the mill home, the pneumatic motor driven vari-speed adjustment worked well. Now it has become extremely sluggish and seems to hiss and leak a lot of air when working, especially badly when decreasing speed.

This is driven by this pneumatic valve:

If anyone knows who made it, , I woud be really grateful.

I dont have a clue as to model or maker..but I mentioned this before..that you will be finding a few of these issues for the next year or more as old seals start disintergrating under the normal working conditions. Nothing to be concerned about, just be aware of.

Gunner

I am the Sword of my Family and the Shield of my Nation. If sent, I will crush everything you have built, burn everything you love, and kill every one of you. (Hebrew quote)

Yep. Just to confirm your own statement:

The rubber air hose that supplies incoming air for the mill, is also rotted, as I just learned. It is beyond redemption, and needs replacement. It leaks air when put on a barb fitting, due to cracks in the inner rubber layer.

No big deal.

I took the valve apart:

I have a feeling, therefore, that it is not the valve that is bad.

I now suspect that the air motor is somehow bad. I will try to test it with an industrial fitting to 37 degree flare adaptor.

Have you figured out what kind of hose is best for the replacement?

I need to buy some hose for argon-tank to welder hookup. The existing 2-year-old hose had small exterior cracks (but apparently no leaks) at each fitting. I dealt with it temporarily by cutting a couple of inches off each end and then not tightening the hose clamps as tight as before. However, I want to replace the hose with a better grade.

A little update on the valve situation.

1. With the valve in, but hoses disconnected from the pneumatic speed adjustment motor, operating the valve electrically creates very robust streams of air from the hose.

1. With a blow gun connected directly to motor, the motor operates very robustly.

2. With the valve connected to the motor, the motor operates poorly.

On the surface, it kind of confirms a hypothesis that it is the outlet for air that is plugged. I will look into this some more.