You don't offer any information as for "when" to rebuild a check valve. For that matter, neither does Flow offer much information about how often to replace the check valve parts (though I am sure their sales team would like this to be quite frequently lol). In general I do not rebuild my check valves every time I have to go in to replace my high pressure seals. I will generally rebuild the high pressure seals 2 - 3 times before lapping and rebuilding a check valve. Even then I often feel that I may be doing the check valve rebuild prematurely. I've rebuilt my check valves dozens of times over the years but I don't think I've ever had one actually fail to the point of an over stroke or loss of cutting pressure. The only clue I can reliably use to gauge when a rebuild kit is needed, is when I start to hear the check valve "squeal" a bit on each stroke (think clarinet or horn sound). I would be curious to know at what intervals you guys recommend the lapping and rebuild of check valve rebuild. Anyhow, great video series, sure wish I had know about your channel years ago when I was learning how to maintain a Flow IFB 60K. Thanks for all the clips!

Hello