In my experience the best translation is audit, especially if you're talking about a Quality System.

"Inspection visit" is kind of clunky, I wouldn't use it. At most "on-site inspection" if you want to use inspection.

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Note added at 34 mins (2018-07-04 09:31:29 GMT)
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See here "visita ispettiva o audit"

http://qualitiamo.com/misurare controllare/Indicatori/verifi...



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Note added at 35 mins (2018-07-04 09:31:54 GMT)
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sorry "verifica ispettiva"

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Note added at 51 mins (2018-07-04 09:48:30 GMT)
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Some other references (for "quality audit" Google returns 46,200,000 results, so it is definitely not just accounting. It is ALSO accounting.)

http://asq.org/learn-about-quality/auditing/
http://smallbusiness.chron.com/quality-audit-3812.html
http://www.businessdictionary.com/definition/quality-audit.h...

As for the translation, you can also find numerous examples of "visita ispettiva" or "verifica ispettiva" with audit.

One of many:

http://www.afiscientifica.it/wp-content/uploads/2017/07/Alle...

See page 7 with the title AUDIT and the subsection Resoconto della visita ispettiva.