Hedd,
hard to say for certain, but would guess yes. No drawings survive for this type of tap, but I have seen this style of fitting in both 1/2 and 3/4 bsp sizes on original looking burrell engines (but with a threaded outlet) in both bent nose and straight way. I know of a pattern for the 3/4 size and I will make a 1/2 bsp pattern for 2551. Interestingly, the burrell I know with a similar 1/2 fitting on the injector was not supplied new (1902) but the engine was rebuilt by garrets.
Most burrels are fitted with plug cocks or laterly globe valves. I have a hunch that there was a 'mid period' fitting as you show. Several showmanship are so fitted.
As for injector valve, sorry can't help, only know of 3/4. Pattern.
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