Joywayus Air Check Valve G1/4" Female Threaded Full Ports One Way Silver Brass Copper Nickel Plating Non Return Pneumatic Check Valve

The media could not be loaded. Similar to other reviewers, I do like this check valve. I thought it’d be helpful to show how to make the pressure adjustment others mentioned, so I have included a 60 second video.A pair of needle-nose pliers does the trick. You can feel the pressure difference by pushing the intake side with your pliers, then on the output side, unscrew the T-stem a few turns and feel the difference again.Note that for check valves, you’ll always have a pressure difference from the source to the output: that’s how they work. The trick is to adjust that difference to what works for you, like another reviewer used it for keeping the compressor from cycling too often (big pressure difference), or for simply preventing blowback when removing air hoses (little difference so there is minimal pressure loss).

I use these to feed a 1-gal pig tank off of a 2-gal compressor for airbrushing and LOW volume dusting, to keep the compressor from cycling often. These are ADJUSTABLE and I have them set for a higher pressure which allows me to use the pig-tank for a longer period of time before the compressor cycles. So the 150psi limit is no issue.PROS: Did I mention ADJUSTABLE? And the O-ring seal is replaceable.CONS: The adjustment is a threaded crossbar held by spring compression, SO it needs to be locked in place with a drop of thread-lock (or I use a drop of gel-superglue).I love this style of check valve and would recommend.

The media could not be loaded. I used the 1/4in check-valve on the filler side of a portable compressed air tank. I used to have a manual valve there. The check-valve is much nicer. It allows me to fill the tank and then simply disconnect the the filling hose. No leakage.The valve could be a bit shorter, though this length worked perfect in my application.

Seems to be a good product, but the pressure required to open the valve was higher than my system required. I didn't see a minimum pressure requirement on the description.

Joywayus Air Check Valve G1/4" Female Threaded Full Ports One Way Silver Water Brass Non Return Check Valve (Pack of 2)I am always amazed at the things my husband wants, and this was one. When this arrived, and he tried it, he said that this check valve uses a pretty simple yet effective mechanism. As you can see in the photos he took, it has a spring-loaded pointed piston to center an o-ring into a seat to stop airflow in the reverse direction. If there is higher pressure in the forward direction, the air pressure pushes against the spring-loaded piston which opens to let the air flow. The problem he had with both of these is that there was about a 20PSI pressure loss across the check valve. After inspecting it, he realized that he could easily adjust the spring force by backing-out the rectangular nut that compressed the spring by a few turns, which lowered the pressure loss to about 5PSI, which is fine for his purposes. He’s guessing that the ones he got were a little overtightened during factory assembly because 20PSI is a bit much. After making this really simple adjustment, both valves work great. Recommend.

I use this in a liquid cooling rig to prevent backflow. The internals are brass so you have to make sure your cooling loop is red metal and not aluminum. (Galvanics) But the G1/4 fits nicely with the other standard fittings in the system. And the backpressure is not significant.If i had to get picky, I would like to wish for a lower cracking pressure and a M-F configuration. But all-in-all this is a great deal on a very hard to find component for PC Liquid Cooling.

The media could not be loaded. Works good used with a long air hose to stop bleeding back into the regulators and other connections. Makes less scarry to disconnect long hoses and does not take as long to bleed out pressure to adjust to lower pressures.

Bought this to use on a condensate pump since it stated it works with water. Oh it's hard to believe that the pressure of a brand new condensate pump has an issue opening the valve. Waste of money.