Change background image

Do I need a 1way valve

Discussion in 'General 4x4 Discussion' started by red hilux, Nov 30, 2018.

  1. red hilux

    red hilux Well-Known Member

    I’m not sure if it’s needed or not

    I know you do need it for bigger air tanks. But I’m only installing a 2.2 liter air tank to an ARB twin head compressor.

    I asked someone at arb once. They said yes. But at the same time, I can’t see a 1way valve on their twin head with air tank compressor. Is that a do as I say and not as I do thing?
  2. Hoyks

    Hoyks Well-Known Member

    Big compressors you need one and the bigger compressors have unloader valves so the motor can spin up to speed before they start pushing full pressure. They are also pushing a lot more cc's with much bigger pistons and lower RPM than a small 12V job.

    I built my compressor in a box with a 2L air tank and no one way valve and it goes well. The compressor has no issue starting with 110psi in the holding tank When you think about it, its no difference to switching off the compressor to check the gauge and then flicking it on again
  3. phs

    phs Well-Known Member

    So the compressor pumps air into a positive pressure

    Once it stops the system can relief back to atompheric, if there is no check valve that system is always pressurised will that hold over time

    If having air in the tank all the time is not important well I guess it's not important to have a check valve

    If it is only a small tank I guess it's not that important More important is keeping the water to a minimum
    cradokaone likes this.
  4. Albynsw

    Albynsw Well-Known Member

    I have heard of back pressure from tanks damaging the compressor
    phs likes this.
  5. mac_man_luke

    mac_man_luke Well-Known Member

    I planned on adding one to my setup but ended up with a faulty valve so never ended up using one and its been fine
  6. typhoeus

    typhoeus Well-Known Member

    without the valve, wont you get air leaking back to the piston and past the rings , thereby slowly losing the stored air?
    cradokaone likes this.
  7. mauriceb

    mauriceb Well-Known Member

    That is correct @typhoeus ,also refered to as a no return valve . Had to fit one to a previous vehicle setup to stop it leaking back thru compressor
    cradokaone likes this.
  8. Batts88

    Batts88 Well-Known Member

    I wouldn't see any real need for one on a single compressor I've been running my 14yr old Bushranger Max air into an air tank most of it's life with a 120psi relief valve on the tank which helps get rid of water in the tank and without a one way valve near the compressor. I haven't noticed any harm done to the compressor but yes the tank will loose pressure during the day.

    Recently I fitted a second compressor as a back up via a T-piece I put one way valves on both air compressors it's wired up so only one can be turned on at a time. The air tank is now holding pressure it will be down to about 40psi after 2 days which is ok so less work to get it back up.
    Last edited: Dec 5, 2018
  9. peterfermtech

    peterfermtech Well-Known Member

    Can I ask why you are fitting an air tank? From a previous post I understood you had e-lockers.
  10. typhoeus

    typhoeus Well-Known Member

    If you are pumping up a tubless tyre and its off the bead, you need a blast of air to get it seated enough to seal
    peterfermtech and cradokaone like this.
  11. red hilux

    red hilux Well-Known Member

    I do have elockers

    Make pumping quicker.

    Builds pressure for the next tyre so to speak.

    While moving between tyres or even first start
    peterfermtech likes this.
  12. Batts88

    Batts88 Well-Known Member

    Depending on your set up if you have a cut of pressure valve all good but if a pressure release valve like my set up you will have to be reasonably quick moving between tyres with a twin head compressor a larger 6ltr or similar would be a better size if you have room.
  13. Albynsw

    Albynsw Well-Known Member

    I have managed to do it twice with just the ARB twin compressor but yes it would be handy to have
  14. peterfermtech

    peterfermtech Well-Known Member

    Just curious because I am upgrading my air compressor and have been thinking about an air tank but 2.2l of air (a little bit bigger than a coke bottle) didn't strike me as being of much advantage. Having one of those 240v compressors with the frame as an air tank it only ever gives me about 2 shots with the framing nail gun before the compressor kicks in so I was wondering what advantages there might be to having a tank given i don't have much room for one.
  15. unko84

    unko84 Active Member

    If you have a small air tank witch fills fully up between changing from 1 tire stem to another tire stem it would be beneficial. if you have a biggish air tank you have to fill up the volume of the air tank first to build up some air pressure and then tire the tire will depressure the air tank , so then you will be pumping the air tank and tire at the same time. You will have to pump more air overall, the only benefit form a big air tank is if you prechage it for the first tire and air tools.
  16. Batts88

    Batts88 Well-Known Member

    I currently have an 18ltr tank which is a bit big for my compressors previously I had a 6ltr which was better and I reckon I was able to pump the tyres up faster because I didn't have to wait long for it to fill up between tyres. The only other real benefit of the larger tank is the storage capacity I can turn the compressor off when the tank is full and have enough air to top up the tyres on my wife's car which usually takes a few pounds each. Next time I will go back to a smaller tank and get an alloy one not steel.
  17. typhoeus

    typhoeus Well-Known Member

    Ive seen old fire extinguishers, gas cylinders, even rock sliders used to store compresed air. Extra air for only a lilttle extra work is always handy.
  18. red hilux

    red hilux Well-Known Member

    I don’t have room for a big tank. At the same time. I think the charge time between tyres would be about right
    peterfermtech likes this.
  19. peterfermtech

    peterfermtech Well-Known Member

    I'll be interested to hear how it works out and may look at a tank later.
  20. cam04

    cam04 Well-Known Member

    I've gone through that process a few times and believe it or not the compressor hooked directly to the tyre helps me best. I manipulate (bear hug) the tyre and as soon as it seals the compressor will speed up and you know to stay still for a bit until the pressure builds and then clear out until the bead seats. The compressor does the rest. I see your point but I'd suspect that usually the plenum would just run out of pressure while you fiddle around trying to get the seal and then you won't have instant back pressure to know when you have the seal? Just a thought.
    peterfermtech likes this.

Share This Page