01. valve design and manufacturing : as per API 6D.
02. flange dimension and drilling : as per ANSI b 16.5 up to 24" dn (for 22" dn-mss sp 44) & as per ANSI b 16.47 (series-a) for 26" dn and above.
03. face to face dimension : as per ANSI b 16.10.
04. materials of construction : (a) body, bonnet & cover : Forged steel ASTM a105.
(b) ball : Forged steel ASTM a105 with 0.003" electroless nickel plating.
(c) stem : Forged steel ASTM a105 with 0.003" electroless nickel plating.
(d) seat : PTFE.
(e) seat retainer : ASTM a182-f316.
(f) bolting : ASTM a193-b7 and ASTM a194-2h for bolts and nuts respectively.
(g) seal : Primary seals electroless nickel coated, secondary nitrile o-rings (double block and bleed