I definitely did not buy a too small check valve. The designer and head engineer spec'd a 1" NPT pressure relief valve. The whole valve is about 6" tall, way overkill but he could not be convinced otherwise. The flow is ridiculously high at 178 SCFM, far more than we need.
The problem is it...
I need a 1" 15psi soft seal pressure relief valve.
We are building a high voltage test chamber that will be filled with sulfur hexafluoride (SF6) to prevent arching. The plan for the chamber is to pump it out to around 10^-3 torr or lower (aka higher vacuum) then to fill it with SF6 up to 1 atm...
I was trying to follow the forum policies as outline in your signature. I posted the topic in that forum with a link to this one and it promptly got deleted. I think I'll try and restart the thread over there this time.
If it starts weeping at 14psi that is absolutely fine. the one I have weeps at 11 psi (if I'm lucky) and when pressurized and left overnight it doesn't hold any pressure (and yes I leak checked everything with a helium leak detector, it's not my fittings). The vacuum pressure will be around...
The pressure relief valve only needs to pop at 15psi but it does need to be able to hold a vacuum. If the relief valve used a hard seal like bronze it would leak when put under vacuum.
The main reason I believe the Kunkle valve failed is that they are adjustable and 15psi is the lowest value offered so the tolerances were horrible when they would be acceptable at 150 psi. If someone can find a non adjustable valve I think that would be best.
I forgot to add I am located at...
I need a 1" 15psi soft seal pressure relief valve.
We are building a high voltage test chamber that will be filled with sulfur hexafluoride (SF6) to prevent arching. The plan for the chamber is to pump it out to around 10^-3 torr or lower (aka higher vacuum) then to fill it with SF6 up to 1...
