The valves are supplied to us. If a satisfactory solution cannot be found with the existing valve, then we'll have to go back with possible alternatives. (we have looked briefly but found nothing satisfactory and manufacturing our own is expensive)
But for now, I'm assigned to find a suitable method to use the existing valve.
HowDidYouBreakThat, you right. This is why we want to have someway to control the general direction. Then if need be, we can make minor corrections (+/- 20degrees) with the amount of tape.
New PostOldhydroman, although a torque spec is not preferred for tapered threads, it can be done. The FAA is big on torque fittings and some NPT threads do have torque specs on aircraft fittings. The lock nut I think would work... I'll look into this. The hose-clamp/tap method is only for our specific tap that we used in our shop (meant for us only); I doubt anyone would be able to replicate this with any success unless we sent them out tap or otherwise the same type/mfg/model.etc -- The valve thread is not clocked therefore the valves are not interchangeable using our method (valve.jpg), each valve is specific to its boss, via the "leave valve installed in boss and forward to inventory note". As of right now, orientation of interchangeability is not a requirement, merely that it can be removed for repair or replacement if necessary. -- A gap-filling, anaerobic, semi-hardening pipe sealant could work but it has to be fuel-proof (which almost nothing is). There are situations when the tank can be tilted up (at around 30 degrees) and when full, would completely saturate the valve, thus necessitating the need for a float valve in the first place (to prevent the fuel from pissing out the vent). Otherwise a simple roll-over valve would have been suffice.
I'll look into the SAE J1926-1 port form.
The socket welded unions still requires custom trimming; I can't seem to visualize how it could be used to install the valve given the circumstances.
I think the only requirement for distance between the edge of tank and the CL of the nozzle is that there is no over-hang. But I cannot visualize how a union between the wall of the tank and the nozzle would be a solution.