Will this check valve maintain a vacuum inside a tank, and at the same time allow pressure to vent? I need a low presscheck valve that works with air
820923
I have 2 installed. Yes they are suppose to. I have 2 of the larger brass ones. I think those work better. I replaced one of these with the larger brass one. I have these smaller ones on the basement zone and seem to work fine. From what I was told the knob has to be screwed in. the air will still be able to get out. I had one of these that did not seem to do the job and just put the brass one in. Everything is fine now. Just started the furnace last week and no air in the system. I think these small ones with the knob on top can leak. The one of mine did. Some one else said the same thing.
1934617
It seems to me, that gas and germs always pass from high pressure side to low pressure side. Pulling a vacuum for short term or moderately long term storage would be OK, but for long term storage it would be self defeating.
965992
The lower valve is for the air expansion diaphragm inside. It is charged with compressed air at the factory and should not be tamper with as you could damage the fragile internal Teflon diaphragm. The top inlet/outlet has threaded port to alow for a range of connections to almost any RO unit.
1475754
Yes, it can, and that is how I ended up with a broken unit. It is supposed to work, but when I applied vacuum, the gauge topped out and has not moved since. (high side). I was able to pull a vacuum and do the work. I think I got a bad unit. Still, all together, it cost less to buy this and have it go bad than to have the A/C work done in the first place.
1897070
I don't see why not, it is just a simple manual style rotation valve and gauge. However, leaking air does not cause much problem, you may want a higher quality/tolerance item for your application.
356815
I would be careful on how much force to use. I just purchased a new valve for a leaky tank, but when pulling out the old plastic insert, I could hear the crunching of plastic and indeed, the plastic around the opening had crumbled, making a new valve pointless, and requiring me to purchase a replacement tank. I wasn't even pulling that hard, or twisting it, but apparently after 10 years the plastic tank isn't in mint condition anymore.
233503
I agree with the other reviewer, just overfill a couple of pounds. Not much air should bleed out unless you have a faulty valve.
232078
Yes, but I would NOT recommend this product, it would not hold pressure (valve leaked)
1136025
Maybe. It's not the pressure you have to worry about, it's the air volume/tank capacity. That little compressor may not be able to keep up. I use an ancient Curtis 220 volt, huge 5HP motor with an 80 gallon tank. It does the job.
1801460
would work good, but you better use an air regulator to cut down the pressure. you would have to expirement to get pressure were you need it so it don't blow it to far.
2006089
It's a three way valve!!It's not a check valve, but I guess you could use it with a secondary discharge pipe so you can manually switch the location of the discharge.
761121
Air pressure is air pressure, yes, it works on all common valve stems so long as the pressures don't go into the semi-truck or skinny-tire-road bicycle pressures (~100 psi).
613243
I have had no problem with the valve. The stopper goes in gently, and it hold the air till I am ready to deflate. When flying, you are not supposed to inflate it until you are at cruising altitude, though.
510770
No. The valve is small and you have to push down and blow into it at the same time. Really it works best to blow it up on the surface via your own breath.
751642
Tools using continuous air, or blowing, I don't think it would maintain enough pressure. Works great for nail guns, pumping up tires.
1342784
The scan tool will perform certain output test, you have to enter under special test. I have not used for evap vent valve, but have used for TCC and Psi Control Solenoid 1 on Allison transmissions.
178428
Hello, I have a release valve pressure gauge on my unit. When I press to button air is released into the tire. I read the new pressure and decide if the ire needs more air or not. If air is not being released try pressing the small valve at the stem? If air does not come out then you have a problem with the hose connector. Hope that helps. The unit has work fine for me.