Technical Manuals Translated

diff between popit n poppet valve?
hi there! can anyone tell me pls the difference between “popit valve” n “poppet valve”? or r they exactly the same? I am translating a technical manual for an industrial shear equipment -a large one- from english into spanish n I have a line that reads “4 way or popit valve – check for leaks” but I cant find the meaning of popit valve, I only find it for poppet…so, any ideas here? tks in advance!
I have only heard of poppet, I imagine the other is just a mis-spelling.
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