VALVE SIZE		A1 (RF)		A2 (RTJ)		A3 (BW)		A4 (SW)		W
NPS	DN	In	mm	in	mm	in	mm	in	mm	in	mm
2	50	17.75	451	17.88	454	17.75	451	17.75	451	20	500
2 1/2	65	20.00	508	21.25	540	20.00	508	20.00	508	24	600
3	80	22.75	578	23.00	584	22.75	578	22.75	578	24	600
4	100	26.50	673	26.88	683	26.50	673	26.50	673	24	600
6	150	36.00	914	36.50	927	36.00	914	36.00	914	32	800
8	200	40.25	1022	40.88	1038	40.25	1022	40.25	1022	32	800
10	250	50.00	1270	50.88	1292	50.00	1270	50.00	1270	32	800
12	300	56.00	1422	56.88	1445	56.00	1422	56.00	1422	32	800