VALVE SIZE		A1 (RF)		A2 (RTJ)		A3 (BW)		A4 (SW)
NPS	DN	In	mm	in	mm	in	mm	in	mm
2	50	17.75	451	17.87	454	17.75	451	17.75	451
2.5	65	20.00	508	20.25	514	20.00	508	20.00	508
3	80	22.75	578	23.00	584	22.75	578	22.75	578
4	100	26.50	673	26.88	683	26.50	673	26.50	673
5	125	31.25	794	31.75	807	31.25	794	31.25	794
6	150	36.00	914	36.50	927	36.00	914	36.00	914
8	200	40.25	1022	40.87	1038	40.25	1022	40.25	1022
10	250	50.00	1270	50.88	1292	50.00	1270	50.00	1270
12	300	56.00	1422	56.88	1444	56.00	1422	56.00	1422