vac relief settings

milspec6 wrote:

Davey Cracker wrote:

SCCC wrote:I cranked my vw the other day to @ 20 and broke my pulley...ugg. I think the belts would give away befor you imploded a tank, well at least the tanks I have they are full of bracing it would take a lot of vac to cause damage to them, belts would over heat, or in my case the pulley broke.

What do you think would break first on a direct driven unit?

On a butler, it would be the clutch.  I think the double belts would be enough to survive the stress, but not that clutch.

I guess I should have clarified, I was thinking about a TM like mine, slide in....where the blower is direct driven off the engine crank shaft threw a flex coupler.

Hey guys
We talked about this awhile ago. But I came across something different today and thought I would see what you think.
So a new customer comes in today with a unit that he had bought no name on it or anything. Wanted me to check it out. It's his first tm been using a portable for a couple years. Anyway as I am checking it out I put my hand on the vac inlet, and the vac went past 20hg and still climbing. Pulled my hand off and get to looking and no vac relief. Not what I'm used to seeing anyway. It has a 2 inch gate valve. To adjust the vac load put your hand on the vac inlet and open the valve to adjust your vac load.
So have any of you guys ever seen this.

Is the gate valve a bleeder system then? I saw a unit similar to that back in the '80's where it just always had an open vac system. It worked except that the vac always seemed to roller coaster too much in strength.

My TNT set at about 14" right now and my Butler a little less. I think seeing 20" would make me very nervous and it sure could get ugly if a relief doesn't open. At least with a continuous leak system, you will never have to worry about a severe failure.

Nic nellos does that on some of his unit. Not sure 'if' he still does it.
Allows you to adjust the relief.

Ive done.that by accidents lol. If he forgets to close the valve after he finishes the job he'll have dirty smelly water in the van