Flow restrictor question?

[Phasor00]

I have tried searching but unable to get an answer to my question. I have a female quick disconnect fitting with a flow restrictor screw in the center of it. Does the flow restriction increase by turning the screw in or out? This my seem like a simple question but I've never been able to find a definitive answer. Thanks in advance for the correct answer.

 

[Humdinger]

It's not a flow restrictor it's a back check valve. It's spring loaded and that slot on the rear isn't there to adjust flow. It seals using an o-ring on the inside of that slotted back check stem. The slotted end is to aid in removing it to replace the o-ring. I've seen hex threaded brass restrictors in the base of tank valves but the threads are to hold it in place or allow for removal not for air flow regulation.

 

[Phasor00]

It's not a flow restrictor it's a back check valve. It's spring loaded and that slot on the rear isn't there to adjust flow. It seals using an o-ring on the inside of that slotted back check stem. The slotted end is to aid in removing it to replace the o-ring. I've seen hex threaded brass restrictors in the base of tank valves but the threads are to hold it in place or allow for removal not for air flow regulation.

Thanks for the reply. On my quick disconnect there is no spring just the screw...I just figured that it was there to restrict air flow.

 

[Humdinger]

Thanks for the reply. On my quick disconnect there is no spring just the screw...I just figured that it was there to restrict air flow.

Most check valves just have an o-ring on the post with the screw slot as yours does. The spring is immaterial but some have them. It's there as a check valve rather than a flow restirctor.

 

[Phasor00]

Most check valves just have an o-ring on the post with the screw slot as yours does. The spring is immaterial but some have them. It's there as a check valve rather than a flow restirctor.

Thanks...I'm learning more and more about this hobby. I'm 73 and just bought my first air gun last November. Now I have four and two compressors and two air tanks....quite addicting hobby!

 

[Ricklin]

A check valve like that will save wear and tear on your compressor if installed on the input of your air filter. Makes it easy and efficient to allow the compressor to stop and cool down when filling tanks. WIth a check valve on the filter input the filter can retain the high pressure, basically you are only bleeding the high pressure hose between the pump and the filter. A big filter holds a lot of air, relatively.