Need help finding shut off valves

Would this work? I have a Hatsan spark compressor and I added a Tuxing large filter to it. The problem is that by the time it fills up the filter to pressure and starts to fill the gun it is close to its max temp so I have to shut it down and wait. I'm thinking to add a shut off valve to both ends of the filter so that I can shut them and keep the filter at pressure while I bleed the line to the gun and compressor so that I can disconnect them. I found a small filter with a built in bleeder that I can put on the line going to the gun to bleed that line and I can bleed the compressor with its built in bleeder but I need two shut off valves, one on each end of the filter. Does anyone know where to find them? I guess it would also be nice to have a gauge that shows the pressure in the filter.
 
When I had my Omega Air Charger I used two Thermo scuba valves to lock off the drier in between sessions for the same reason. They are 6000psi rated. They are the two black knobs in photo. 1/4NPT male and female threads on each.

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Since you have a vent point, I'd simply put in a one way foster fitting like this one from amazon. This one is male, but I bet they have female ones too. https://www.amazon.com/gp/product/B08R792TGF/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Unfortunately a one way fitting won't work for what the OP wants to do which is to maintain pressure in the trap / filter but have no pressure at the compressor or the gun. It would work to keep pressure in the trap and none at the compressor, but it would not be possible to remove the gun from the fill hose without losing pressure in the trap, unless there is a shutoff valve and a bleed valve between the trap and the gun.
 
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If you're reaching almost max temperature just filling the filter, maybe you can augment/improve your cooling system OR get a smaller volume yet efficient filter. Just a thought. I use an Airmega filter that I filled with dessicant beads & activated charcoal, using the cotton filters (cut down in length) to hold that stuff in. Works VERY efficiently.
 
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Unfortunately a one way fitting won't work for what the OP wants to do which is to maintain pressure in the trap / filter but have no pressure at the compressor or the gun. It would work to keep pressure in the trap and none at the compressor, but it would not be possible to remove the gun from the fill hose without losing pressure in the trap, unless there is a shutoff valve and a bleed valve between the trap and the gun.
That's exactly what I'm going for. I can see how a check valve will work on the compressor side of the filter and even on the gun side whip as long as I have a bleed screw on both sides of it. In that case a whip would also stay under pressure. I would have two whips going to the compressor and two going to the gun so that gives me a extra fitting to work with as far as adding a shut off or check valve.
 
If you're reaching almost max temperature just filling the filter, maybe you can augment/improve your cooling system OR get a smaller volume yet efficient filter. Just a thought. I use an Airmega filter that I filled with dessicant beads & activated charcoal, using the cotton filters (cut down in length) to hold that stuff in. Works VERY efficiently.
Yeah I looked into buying a smaller filter but I already have $100 into this one and it's a good filter so I'm looking to use it and not just throw it in my drawer of bad ideas. Even with a smaller filter the compressor will still be filling more space then it needs to per run. Next year I wont have this problem because I'll have a bottle filling compressor but I want a motorcycle this year lol.