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Sempell Nuclear Model HKS High Pressure Check Valve
Model HKS
High pressure forged swing check valves designed to prevent flow reversal in severe applications at nuclear power plants
Sempell Nuclear Model HKS High Pressure Check Valve


DN 50 - DN 600 (NPS 2 - 24)
Up to +450°C / +842°F
PN 160 - 420 / Class 900 - 2500
Body Material:
forged carbon steels, alloyed steels and stainless steels All in compliance with ASME and DIN standards
Buttweld ends: ASME B16.25, DIN 2448 Flanges as per ASME B16.5 and other shapes of welding ends on request


  • High quality forged materials to guarantee pressure envelope integrity, all in conformity with ASME and DIN standards, alternative of cast available on request
  • Designed to comply with ASME B16.34 and/or against nuclear design specifications and codes
  • Bolted bonnet design as a standard, high pressure self-sealing design as an option
  • Easy in-line service
  • No penetration of hinge pin to outside
  • Forged disc/seat
  • Seat surfaces are lapped mirror finish and can be relapped
  • Stellited seat/disc for carbon steel designs lapped to mirror finish
  • Supplied as swing check configuration
  • The inside shape design of the body results in favorable flow characteristics
  • Retaining ring assembly - all moving parts are attached to the ring and can be removed easily for service
  • No penetration of shaft duct to outside eliminates shaft seal leakages