Ideas For Auto Top-Off

[HL649]

I plan on installing an auto top-off system in my sump. I use well water so I plan on using a 1/4" line off my kitchen water line for a water source. This will likely run to a float valve in the sump. I have been looking at a Eshopps float valve (it looks fairly well made). Can anyone tell me how much pressure these float valves can handle? Any ideas to improve on my idea?

Thanks.