Can anyone tell me what does an injector tee do and would a balancing valve not do the same thing instead of the injector tee? And how can you make one using an instanter tee and an insert?
An injector tee (you will probably struggle to find one nowadays) produces a venturi effect.
Delcop used to make one. It looked like a 28 x 22 x 28mm end feed tee with a 22 x 15mm fitting reducer fitted into the 22mm end backwards, i.e. the 15mm bit was actually inside the tee.
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