So in the 2015 Edition of NFPA 99.

In the  valve section the words -

Ball and Butterfly are not listed.

5.1.4.1.6 Valve Types.

New or  replacement valves shall be permitted to be

of any type as long  as they meet  the  following conditions:

(1)  They  have a maximum pressure drop  at intended

maximum  flow of 1.4 kPa  (0.2 psig)  in pressure service and

3.8 mm Hg (0.15 Hg) in vacuum service.

(2)  They use a quarter  turn  to off.

(3)  They are constructed of materials suitable for the service.

(4)  They  are  provided with  copper   tube  extensions by the manufacturer for brazing.

(5)  They indicate to the operator if the valve is open or closed.

(6)  They permit  in-line serviceability.

(7)  They are cleaned for oxygen service by  the manufacturer

if used for any positive pressure  service.

Who make a Butterfly Valve with  copper  tube  

extensions by the manufacturer for brazing?

I seem to remember this being discussed at the annual meeting in KC. The intent was to not limit to only ball and/or butterfly valves, but open the door to "other technologies" not currently in the standard. However the reality is those are still the only two options on the market.