hawa - ball valves, check valves, double block & bleed valves, plug valves, gate valves, globe valves, butterfly valves, cryogenic valves.

Check Valves

Cast Steel Bolted Cover

Our Features

Hawa Valves Cast Steel Check Valves have been designed to meet the requirements of BS 1868 /ASME B 16.34/API 6D-ISO14313
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 cylindrical bottom seated type having ample cross section for strength are provided with welded in and threaded Seat-rings will be supplied on request. In case of SS valves the Seat-rings are integral to Body
The Body to Bonnet joint is a male & female in ISO PN 20, PN 50 & PN 110 / ASME 150#, 300# & 600# valves and ring joint is used in higher classes
Valves meet the requirements of fugitive emission levels Shell category B as per MESC SPE 77/312

Our Features

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
Disc Nut	Carbon Steel / Stainless Steel
Washer	Carbon Steel / Stainless Steel
Gasket	Soft Iron / SS 304 / Graphoil
Gland Packing	Graphite Asbestos / Graphoil / PTFE
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.