Have a small ball valve (1" inch bore, 1.875" ball) and need to have a torque spec for sealing/seating the ball and seals with a retaining nut threaded in.We aren't a valve company, designed one as an add on to another product line. Torque is going to be a function of the valve design. I looked at some Worcester instructions I have, but their design is based around controlled-compression gaskets and you take the retainer up to metal-to-metal. Your valve's internal architecture, profile and material of the seat, and a handful of other variables determine the torque, or whether you even need to measure it. It looks like there's no entry chamfer for the o-ring around the nut's nose, so it may get torn during installation. Leave room for a backup ring or two in the o-ring groove, too. I assume the stem seal is just not shown.While you're increasing the nut diameter and the body diameter to accommodate the entry chamfer, you can also provide a positive stop so the nut stops with the seats in the perfect position, and the threads just shy of bottoming.As it stands now, the only depth stop you've got is the end of the nut and body threads. It's possible for that to work, if you whirl both threads so you have blunt ends on both, and full control over the exact position of the blunt ends.

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