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TYPE NB / ND

NK valve
NB slice
  • Non-slam closure
  • Friction-free valve disc guiding
  • Choice of face-to-face length
  • 12" - 88" (DN 300 - DN 2200)
  • Very low pressure loss
  • Maintenance free
  • Metal sealing
  • Up to PN 400 (ANSI 2500)

The NB is the Noreva standard long face to face for 12" and larger, providing optimum pressure recovery performance and, hence minimum pressure loss.

It is also available with API 6D face-to-face dimensions (ND).

Denomination Ductile Iron Carbon Steel Stainless Steel
Valve Body ASTM A 395 ASTM A 216 WCB ASTM A 351 CF8M
Seat AISI 316 AISI 316 ASTM A 351 CF8M
Valve Disc ASTM A 351 CF8M ASTM A 351 CF8M ASTM A 351 CF8M
Tab Washer AISI 316 AISI 316 AISI 316
Radial Guide Assembly AISI 316 AISI 316 AISI 316
Spring AISI 316 AISI 316 AISI 316
Flow Diffuser ASTM A 216 WCB ASTM A 216 WCB ASTM A 351 CF8M
Central Tie Bolt ASTM A 193 B8M ASTM A 193 B8M ASTM A 193 B8M

Materials according to customers request, such as Low Temperature Carbon Steel, Nickel-Aluminium-Bronze, Duplex, Superduplex, 6Mo, etc.

exploded NB