Condition

  • Home
  • Condition
  • Pure fluid
Blow back valve
Working condition
Pain Points and Proposal
Reference
Consult

Working condition

Pressure RatingCLASS 150 to CLASS 1500 (PN 10 to PN 260)
Nominal SizeNPS 1.5 to NPS 8 (DN 40 to DN 200)
Seat Leakage ClassANSI FCI 70-2 CLASS VI or higher
Applicable MediaGas phase
Temperature RatingUp to 300°C
Cycling Life≤200,000 cycles per year
Stroking Speed200 milliseconds
Actuation MethodPneumatic

Pain Points and Proposal

1. External Leakage: The bellows develops external leakage after high frequently cycling.  

2. Internal Leakage:

After high-frequency cycling, the valve seat damaged, resulting in internal leakage.  

1.One-piece extended bellows, a purely imported product, features a compression-type bellows design, which effectively enhances the spring recovery capability when the valve is closed and reduces the spring recovery time.

2.Strict welding quality control ensures a secure connection between the bellows and valve trim.

3.A high sealing specific pressure design prevents high-speed metal-to-metal impacts, ensuring zero leakage under long time working.

4.The valve seat is made of high-strength engineering plastics material, ensuring both strength and toughness.

5.Imported bellows ensure concentricity with the valve stem.


Reference

  • Size: DN 50
    Pressure Rating: CLASS 300 lb
    Medium: N₂
    Temperature: 250°C
    Material: F316
    Opening/Closing Time: <0.2 s