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

Check Valves

Cast Steel Pressure Seal Cover

Our 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

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
Seat Rings @	AASTM 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.