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Cheap Pump Gauge Or Rifle Gauge?

Discussion in 'Technical' started by Vic Vinegar, Jan 10, 2020.

  1. Vic Vinegar

    Vic Vinegar Engaging Member

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    Ever since I cleaned the excess grease from my pump and fixed the leak the pressure gauge has not correlated with the rifles gauge, didnt work at all until I gave it a good flick. It’s about 30-40 BAR behind rifle gauge when pumping but then slowly increases to about 20 BAR behind. I’m guessing because it’s a cheap pump that I’m best to trust the rifle gauge more? As opposed to when using a cylinder where should rely on the gauge on cylinder then?
     
  2. Bezzer

    Bezzer Busy Member

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    I wouldn' t trust rifle or pump. I'd either be looking a getting a decent quality gauge for the pump... Or better/ cheaper fill the gun to your preferred pressure from a bottle which will have a better gauge and note what reading your gun gauge shows. You'll then know where to fill it to on the gun gauge when using the pump.
     
    John Entwistle and Vic Vinegar like this.
  3. Vic Vinegar

    Vic Vinegar Engaging Member

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    Last option sounds good until I can buy a better pump. Go my local shop in week, get it filled to 200 bar on cylinder and then check gauge on rifle and don’t go passed that when using pump at home :thumb: Thank you

    regards Michael
     
    Headshotharry likes this.
  4. ukzero1

    ukzero1 Engaging Member

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    Wouldn't your local gun shop be able to test both? At least then you'll know which to trust.
     
    Vic Vinegar likes this.
  5. Vic Vinegar

    Vic Vinegar Engaging Member

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    How would they test the pump gauge?
     
  6. Lev Levvin

    Lev Levvin Pro Poster

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    Gun gauges are not accurate enough to be fully trusted... they’re very slow to react to pressure and prone to sticking

    they’re only a guide to what you have left inside the cylinder

    dive bottle gauges are usually very much more accurate
     
    Vic Vinegar likes this.
  7. ukzero1

    ukzero1 Engaging Member

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    By putting it on another pump with a gauge that's known to be accurate.
     
    Vic Vinegar likes this.
  8. Vic Vinegar

    Vic Vinegar Engaging Member

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    Using rifle gauge is only a very short term solution. I checked with cylinder yesterday and rifle gauge was pretty much spot on with what cylinder was saying


    Ah okay thank you, I will take it with me next time I go
     
  9. Lev Levvin

    Lev Levvin Pro Poster

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    If you can unscrew the gauge on your pump... then you’ll almost certainly find a good quality replacement on Best Fittings website

    I got one for my old dive cylinder there :thumb:
     
    Vic Vinegar likes this.
  10. Lev Levvin

    Lev Levvin Pro Poster

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  11. Vic Vinegar

    Vic Vinegar Engaging Member

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    How would I know what size(?) to get? With there be markings on original gauge?
     
  12. Lev Levvin

    Lev Levvin Pro Poster

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    Hmmm... I’m not sure to be honest...

    I just ordered one that looked ‘right’

    I’m pretty sure most cylinder gauges are 1/8” threaded...

    take yours out and measure the brass threaded part?

    it will be around 9.5mm if it’s 1/8” bsp
     
    Vic Vinegar likes this.
  13. Lev Levvin

    Lev Levvin Pro Poster

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    You need to check the pressure readings on the new gauge... make sure they go to 300 + bar
     
  14. Vic Vinegar

    Vic Vinegar Engaging Member

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    Thank you Lev :thumb: it seems about a centimetre thick so you’re probably right. What about depth of screw, measure that as well or is that universal?
     
    Lev Levvin likes this.
  15. Lev Levvin

    Lev Levvin Pro Poster

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    Post up a pic of your gauge if you can... might be able to match it?

    If it’s 1/8” BSP that’s a standard thread... it’ll have a set length... and tbh it doesn’t matter if it’s a bit longer.
     
  16. Lev Levvin

    Lev Levvin Pro Poster

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    1/8” BSP thread is actually 9.728mm exactly so 1cm is pretty close
     
  17. Vic Vinegar

    Vic Vinegar Engaging Member

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    65AFB503-B24B-4AE2-B452-405F82DD3826.jpeg 59DEB1D5-73B4-42D9-97DC-B7434008D4D1.jpeg

    Is it supposed to be angled like that as well you think?
     
  18. Lev Levvin

    Lev Levvin Pro Poster

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    I think that’s just slightly bent tbh

    i think the only way you’re going to know for sure is to either take the gauge to a local hydraulic/ pneumatic specialist to check the threads, or just buy a gauge from best fittings and try it.

    If it doesn’t fit then return it.
     
    Vic Vinegar likes this.
  19. Lev Levvin

    Lev Levvin Pro Poster

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    Only thing that’s bugging me is the brass thread doesn’t look tapered on your gauge...
    it looks the same diameter all the way down
     
  20. Lev Levvin

    Lev Levvin Pro Poster

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    I’m getting a bit concerned the more I read into this...

    best fittings also sell 1/4” threaded gauges...

    1/4” BSPP which is british/ European

    And 1/4” NPT which is American / Chinese

    where is your pump made ?
     
    Vic Vinegar likes this.

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