CHECK VALVES       BALL VALVES GATE VALVES GLOBE VALVES   CHECK VALVES     DOUBLE BLOCK & BLEED VALVES     PRESSURE BALANCE PLUG VALVES     FORGED VALVES     SOLENOID VALVES     BUTTERFLY VALVES     BELLOW SEAL VALVES     CONTROL VALVES                                                                                                           CAST STEEL PRESSURE SEAL COVER       Features:     = Hawa Valves Pressure Seal Check Valves have been designed to meet the requirements of BS 1868/ASME B 16.34 = Face to Face and End to End dimensions conform to ASME B 16.10 / ISO 5752 / BS 2080 / DIN = End flange dimensions conform to ASME B 16.5 / ISO 7005-1 / API 605 / BS 3293 / DIN = Butt weld end dimensions conform to ASME B 16.25 = The Seat-rings are satellite faced cylindrical bottom seated type having ample cross section for strength are securely welded in place = The gasket design ensures self sealing under pressure = The inner row of studs establish the initial seal of the Pressure seal joint = Valves meet the requirements of fugitive emission levels Shell category B as per MESC SPE 77/312   Options:   = Tilting disc design available = Check Valves can be supplied with counter weight or dash pot arrangement = Full opening, piggable design available = Can be supplied with "GRAYLOC END HUB", under project license from GRAYLOC PRODUCTS ®, UK.     Materials :     Part Name Material Option   Body ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Cover ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Disc @ ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Hinge  ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217     C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Hinge Bracket ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Hinge Pin ASTM A 276 410 / A 276 304 / A 276 304L / A 276 316L   Seat Rings @ ASTM A 216 WCB / A 217 WC6 / A 217 WC9 / A 217 C5 / A 217 C12 / A 351 CF8 / A 351 CF8M / A 351 CF3 / A 351 CF3M / A 352 LCB   Back Up Ring ASTM A 216 WCB / A 351 CF8 / A 351 CF8M   Thrust Ring ASTM A 216 WCB / A 351 CF8 / A 351 CF8M   Disc Nut Carbon Steel / Stainless Steel   Washer ASTM A 193 GrCarbon Steel / Stainless Steel   Gasket Soft Iron / SS 304 / Graphoil   Studs / Bolts ASTM A 193 Gr B7 / A 193 Gr B7M / A 193 Gr B8 / A 193 Gr B8M / A 320 Gr L7   Nut  ASTM A 194 Gr 2H / A 194 Gr B7M / A 194 Gr B/ A 194  Gr 8M / A 194 Gr 4/7     * Valves are available in Duplex & Super Duplex Stainless Steel and Nickel Aluminium Bronze. Please indicate Trim required and ask for individual technical data sheets provided separately for these special materials. @ CS & Alloy Steel Wedges and Seat Rings will be overlayed with 13% CR. or STELLITE 6 as per customer specifications.