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Sempell Dewrance Model B21/B51 Check Valve
Dewrance Model B21/B51 Check Valve
The Sempell Dewrance bled steam check valve has been designed specifically for non-return turbine protection on power generation steam turbines.
Sempell Dewrance Model B21/B51 Check Valve


SIL capable, ASME B31.1, India Boiler Registration, PED
End Connection
Butt Weld
Carbon Steel, Steel, Metal, Alloy
Pressure Class
Shutoff Class
Class V (FCI 70-2)
Valve Size
6 inch (DN150) and Larger
Valve Size Standard
Valve Type
Engineered Product, Triple Offset Valve


  • Excellent reliability, internal counterweight to balance disc under low load conditions
  • Tilting disc design for quick closing due to lower center of gravity
  • Lightweight disc with minimum travel, for quick closing in less than 1 second
  • optimum performance under all flow conditions
  • Pneumatic power assistance acts directly onto disc, without leakages to inhibit operation
  • Low cost maintenance, expanded graphite gasket pressure seal design
  • Surface treated hinge pin, supported in surface treated bearings, giving a low coefficient of friction and hard wearing surface for maximum performance
  • Easy access through cover
  • Easy access through cover


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