Features: 1) Size: 1-1/2" - 72", DN40 - DN2000 2) Pressure: Class125 - Class300, PN6 - PN40 3) Design and manufacture standards: a) Wafer and lug: API 609, Din3354 b) Flange and weld: BS5155 / EN598 4) Inspection and test standards: API 598, DIN3230, BS5146 5) Face to face: flange: ISO 5752 6) End flange dimension: a) ASME B16.5 (for NPS≤24") b) ASME B16.47 series B, API 605 c) ASME B16.47 series A (for NPS>24"), or BSEN 1092 7) Top flange: ISO5211 8) Temperature: -20 - 400癈 9) Materials: a) Body: cast iron / ductile iron / WCB / CF8 / CF8m b) Disc: ductile iron / WCB / 316 / CF8 / CF8M c) Stem: 13%Cr / 316 / 304 / SS17-4PH d) Seal: laminated metal seal, U-type metal seal 10) Operation: lever, worm gear, pneumatic, electric, hydraulic or pneumatic-hydraulic actuator 11) Property: longer service life and high temperature and pressure