Manhole dampers can be equipped with different sealing gaskets depending on the application

The performance of Manhole dampers depends primarily on the pressure, diameter, temperature, and type of the flange sealing surface. According to the new HG standard, the following types of sealing gaskets are available:

1. Rubber gasket: Nominal pressure <= 1.6 MPa, diameter 10-2000 mm, operating temperature < 200°C, sealing surface types: raised face, concave/convex face, tongue/groove face, flat face, flange types: various

2. Asbestos rubber sheet: Nominal pressure <= 2.5 MPa, diameter 10-2000 mm, operating temperature < 300°C, sealing surface types: raised face, concave/convex face, tongue/groove face, flat face, flange types: various

3. Non-asbestos Fiber Rubber Sheet: Nominal Pressure <= 4.0 MPa, Diameter 10-2000 mm, Operating Temperature < 290°C, Sealing Surface Types: Raised Face, Concave/Convex Face, Tenon/Groove Face, Flat Face, Flange Types: Various

4. Polytetrafluoroethylene: Nominal Pressure <= 1.6 MPa, Diameter 10-2000 mm, Operating Temperature < 100°C, Sealing Surface Types: Raised Face, Concave/Convex Face, Tenon/Groove Face, Flat Face, Flange Types: Various

5. Expanded or Filled Modified Polytetrafluoroethylene or Tape: Nominal Pressure <= 4.0 MPa, Diameter 10-2000 mm, Operating Temperature < 200°C, Sealing Surface Types: Raised Face, Concave/Convex Face, Tenon/Groove Face, Flat Face, Flange Types: Various

6. Reinforced Flexible Graphite Sheet: Nominal Pressure 1.0-6.3 MPa, Diameter 10-2000 mm, Operating Temperature <650°C, Sealing Surface Types: Raised Face, Concave/Convex Face, Tenon/Groove Face, Flange Types: Various

7. High-Temperature Mica Composite Sheet: Nominal Pressure 1.0-6.3 MPa, Diameter 10-2000 mm, Operating Temperature <900°C, Sealing Surface Types: Raised Face, Concave/Convex Face, Tenon/Groove Face, Flange Types: Various

8. PTFE-Coated Gasket: Nominal Pressure 0.6-4.0 MPa, Diameter 10-600 mm, Operating Temperature <150°C, Sealing Surface Type: Raised Face, Flange Types: Various

9. Spiral Wound Gasket: Nominal pressure 1.6-16.0 MPa, diameter 10-2000 mm, operating temperature: varies by material, sealing surface types: raised face, concave/convex face, tongue/groove face, flange types: slip-on/butt-weld with neck, integral, socket-weld, and flange cover.

10. Toothed Combination Gasket: Nominal pressure 1.6-16.0 MPa, diameter 10-2000 mm, operating temperature: varies by material, sealing surface types: raised face, concave/convex face, tongue/groove face, flange types: slip-on/butt-weld with neck, integral, socket-weld, and flange cover.

11. Metal Jacketed Gasket: Nominal pressure 2.5-10.0 MPa, diameter 10-900 mm, operating temperature: varies by material, sealing surface type: raised face, flange types: butt-weld with neck, integral, and flange cover. 12. Metal ring gasket: nominal pressure 6.3~16.0MPa, diameter = 10~400mm, operating temperature: 700 degrees, sealing surface type: ring connection surface, flange type: neck butt welding, integral, flange cover