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.

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.