... 6D, API 598, API 607, API 6FA, JIS B20033) Face-to-face standards: ANSI 16.10 / API 6D, JIS B20024) Connection ... / 304 / A105+ENP / MONEL / H.C / TA310) Seat: 13% Cr + PTFE / 316 + PTFE / metal to metal11) Ball: 304 / 316 / A105 + ENP12) Stem ... : 13% / 316 / 30413) Sealing: soft sealing or metal-to-metal seat, Vlton-O-ring and flexible graphite14) Operation: manual, pneumatic, electric ...