FZV Canada
The business partner you can trust.

Pressure Seal Check Valves

Key Applications

  • For application in fields such as the electric power industry, petroleum, tap water engineering in urban construction, chemical engineering, and others.

Design Features

  • Sizes from NPS 2” to 50”(DN50 to DN1250)
  • CLASS 600 to 2500 PN100 to PN420)
  • Operating temperature -196℃ to 593℃ (the range of service temperature may vary for different materials)
  • The sealing faces of valve seat and valve clack are build-up welded with hard alloy to improve the erosion resistance and extend the service life of valve.
  • The pressure self-sealing type is adopted between valve body and bonnet for reliable sealing, where the higher the pressure is, the better the sealing performance would be.
  • Suitable for medium backflow prevention in pipeline or device
  • Large check valves are designed with hydraulic damping cylinder to prevent the valve clack from bumping the valve seat, damaging the valve or causing pipeline vibration due to fast closing.
  • In case of pigging requirement, API 6D swing check valve can be manually operated to fix the opening position of valve clack, so as to achieve the pigging objective.


Design Standards

  • ASME B16.34
  • API 6D
  • API 594
  • BS 1868
  • GB/T 12236
  • GB/T 12224


  • ASME B16.10
  • GB/T 12221

End Connection

  • ASME B16.5
  • ASME B16.47
  • ASME B16.25
  • GB/T 9113
  • GB/T 12224

Test Standards

  • API 598
  • ISO 5208
  • GB/T 26480
  • GB/T 13927