Thread: Super Cheap Auto / Blackridge Air Die Grinder Yay or Nah?

Tony your onto it! When i pulled the check valve apart it looked ok to me but i just watched a few videos on youtube and all those check valves contained a spring there is no spring in mine just the seal button, a thread seal nothing more

I was about to chuck the compressor out too over a $15 part, i have been battling to fix this compressor for 5 years using it as it was wow what an easy fix

Not all valves run a spring. Air pressure is what seals the valve. The spring is usually there to seal for no pressure starting.

Bugger i thought it would have been sorted

Change the seal and see what happens.
From my experience it`s something simple that`s causing the problem, just takes a bit of fiddling.

Tony

One of the YouTube guys (Ave I think) did a vid on air compressors and 'specs'

The upshot is that compressors are rated at 'free air delivery' which is as I understand it a measure of the air volume going IN, at room pressure, wheres the tool air use is measured in litres/Min at the delivery pressure.

Bit like amplifier rating....



Russ

FAD, a marvellous thing.



"The air delivery of a compressor (known also as the free air delivery or FAD) is the expanded volume of air it forces into the air main (network) over a given period of time. The correct method of measuring this volume is given in the following standards: ISO 1217, annex C and DIN 1945, Part 1, Appendix F. ... Proceed as follows to measure FAD: the temperature, atmospheric pressure and humidity must first be measured at the air inlet of the compressor package. Then, the maximum working pressure, temperature and volume of compressed air discharged from the compressor are measured. Finally, the volume V2 measured at the compressor outlet is referred back to the inlet conditions using the following equation ... The result is the free air delivery (FAD) of the compressor package. This figure is not to be confused with the airend delivery.
V 1 =V 2 ⋅P 2 ⋅T 1 T 2 ⋅F 1
V1=V2⋅P2⋅T1T2⋅F1"


Source: Kaeser "Compressed Air Engineering: Basic principles, tips and suggestions."