What's your reference? Cambridge: /ˈvæl.eɪ/ https://dictionary.cambridge.org/pronunciation/english/valet

(britannica[0], merriam-webster[1])

[0]: https://www.britannica.com/dictionary/eb/audio?word=va%2Alet...

[1]: https://www.merriam-webster.com/dictionary/valet

Your Merriam Webster source has "val-it" as the first pronunciation (but I think in this case both are correct and valit is less common)