marvgarr Posted November 29, 2012 Share Posted November 29, 2012 does anyone know what this valve is and what it does Quote Link to comment https://www.bigmacktrucks.com/topic/28603-unkown-air-valve/ Share on other sites More sharing options...
leversole Posted November 29, 2012 Share Posted November 29, 2012 Only two opening? Must be a check valve...but a check valve usually has an arrow marked on it....where is it located and can you verify only two threaded ports? Quote Link to comment https://www.bigmacktrucks.com/topic/28603-unkown-air-valve/#findComment-148657 Share on other sites More sharing options...
marvgarr Posted November 29, 2012 Author Share Posted November 29, 2012 only two ports not a check valve does not hold air in ether direction but seems to limit the air a little when air is put in the direction it was installed does have an arrow took valve apart has big long spring metal disk and in the bottom there is another chamber with a metal ball this valve is in the line from the bake valve to the relay valve for rear brakes this trk does not have front brakes Quote Link to comment https://www.bigmacktrucks.com/topic/28603-unkown-air-valve/#findComment-148659 Share on other sites More sharing options...
leversole Posted November 29, 2012 Share Posted November 29, 2012 Hmmmmmmmm.........I have looked through all of my airbrake catalogs and diagrams, there are not many devices with only two ports that are not check valves!It could be a ratio valve, which is designed to reduce pressure to the front brakes, if so it should NOT be in the line to the rear brakes.A relay valve needs full pressure from the pedal...is there a place on it for a wire? It may be a brake light switch?If it aint either of these you stumped me! Quote Link to comment https://www.bigmacktrucks.com/topic/28603-unkown-air-valve/#findComment-148665 Share on other sites More sharing options...
theakerstwo Posted November 29, 2012 Share Posted November 29, 2012 If there is a spring behind the nut then it would be a pressure protection valve Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/28603-unkown-air-valve/#findComment-148667 Share on other sites More sharing options...
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