Germany MERKEL pneumatic piston ring seal -NAPN

1. Features
      Section asymmetry in the dynamic sealing lips with special pneumatic sealing edge of the U-shaped seal.
      Section asymmetrical long and thick static sealing lip ensures seal tightly positioned at the bottom of the trench.
      This special pneumatic sealing edge seal ring with low friction and maintain an effective lubricant film a good sealing function.

2. Operating conditions
    Media: treated and dried, compressed air without lubricant (grease-coated after assembly).
    Working pressure: ≤1MPa (10bar)
    Temperature: -20 ℃ ~ + 100 ℃
    Line Speed: ≤1m / s

3. Material
    Shore A hardness of about 72 or 80 Shore A nitrile rubber.
    Grade: Simrit 72NBR 708 to Dn = 25 or
          Simrit 80NBR 709 starting from Dn = 32

4. trenches and machine processing standards
    Cylinder: Rmax≤4μm, Rp / Rz <0.5
    tp (25% Rmax) = 50% ~ 75%
    Trench floor: R max≤10μm, Rp / Rz <0.5

5. Install
    Careful installation is to ensure a good seal function prerequisites.
    Pneumatic U-rings can be assembled by hand withhold the appropriate grooves.