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I've never done that to a deceleration valve but I've done it to stock bosch EFI fuel pressure regulators on BMW's in the past. You're compressing the spring inside and raising it's preload against the internal vacuum diaphram.
With the bosch FPR you put it in a bench vise with a correct size 3/8 or 1/2 drive socket on each side and squeeze it a little at a time to compresss the vacuum line end side of the steel canister inwards concave a little to compress the spring on the inside to raise the preload tension on the vacuum diaphram a little at a time until you get it where you want it.
Same procedure might work on a deceleration valve with correct sized sockets or whatever.
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