10-23-2012, 05:52 AM
(10-22-2012, 06:24 PM)f350ca Wrote: The check valve quit checking in a friends compressor. Tore it apart and found a plastic spool broken. Thought about making the new one out of brass but was afraid it might not seal on the flat valve seat so machined one out of an old screw driver handle. The air out of those little compressors must get some hot. The black blob is the first try, made the next one out of brass and it worked like a charm.
Compressing air does generate a whole load of heat, think about diesel engines for a second, it takes only a 15:1 compression ratio at 350RPM to start auto igniting diesel.
so a plastic seal doesn't have a chance, most plastics have lost all integrity by the time they pass 130 degrees C, in fact I cant think of any that have any integrity at all by 120 degrees.
And Dave H sorry I didn't get a notification on this thread so didn't know you'd posted your welding effort,
As others have said,
More cleaning first and then knowing that you used stick, I will ask; have you removed all the slag? as it does look like you have a shielding problem, if you could post what settings you used and the welding rod details, so anything written on the side of the welding rod package, by the look of the flux I would guess 6013 rods or similar, but the rod wire diameter is also important.
Regards
Rick
Whatever it is, do it today, Tomorrow may not be an option and regret outlasts fatigue.