I ran into the same issue this week. That small Sporlan tool will NOT work on a typical service valve. Knotches too tight. I haven't bought the Yellow Jacket tool but I did see it at UR. The YJ looks to be the correct tool.
From what I have been told the Sporlan tool is for TXV gland nuts.
Aircraft Mechanical Accessories Technician. The Air Force changed the job title to Air Craft Environmental Systems Technician. But I've decided I'll always be a Mech Acc.