Corrugated metal gasket

Corrugated gaskets are universally applicable sealing elements. Due to the wide range of shapes that they can be produced in – including rings, ovals, elongated ovals or frames, with or without dividers, holes and retaining plates – they continue to be used in new areas.

The gaskets can be fully or partially coated. Corrugated gaskets with torque support have proven excellent when used with inflexible flanges. Even with unmachined flanges, a satisfactory seal can be achieved with the use of suitable soft-material layers.

The gaskets can be produced in all the usual sizes up to 6000 mm. The corrugation on the carrier holds the layers in place. The gaskets are also suitable for use with vacuums.

Profile cross-section Description
W1A Gewellte Dichtung W1a Gaskets of the Profile W1A consist of a carrier ring W1 with layers on both sides – PTFE for use at temperatures of up to 250°C, or graphite for temperatures of approx. 500 °C with atmospheric oxygen influx. When fitted, the soft plastic layers are pressed into the corrugation. This creates an extremely elastic sealing element with a low leakage rate. In pieces with large diameters and sealing widths, or where there are bumps on the existing flange, it is particularly useful to have layers of RivaTherm Super on both sides. This provides the seal with better stability and evenness. RivaTherm Super layers are made from expanded graphite with a stainless-steel sheet metal insert. The 1 mm product is designated RS1E1, and the 2 mm product is RS2E1. The layer width for RivaTherm Super should be at least 15 mm. The type of layer required should be specified in each case
W1A-3 Gewellte Dichtung W1a
TALuft gaskets such as Profile W1A-3 consist of an optimized corrugated ring carrier W1-3 made of 1.4571 with graphite layers on both sides. The 0.8 mm thick layers have a purity of C >= 99%, a density of ρ = 1.0g/cm3 and a chloride content of <= 25 ppm. The graphite layers do not contain filler or adhesives. The total thickness of a gasket with graphite layers as delivered is approx. 2.9 mm, made up of the 1.3 mm thick corrugated ring carrier and both 0.8 mm graphite layers. 0.5 mm layers of unsintered PTFE are also used. The total thickness of a gasket with PTFE layers as delivered is approx. 2.3 mm, made up of the 1.3 mm thick corrugated ring carrier and both 0.5 mm PTFE layers. When a surface pressure of 30 MPa is applied, the gasket thickness is reduced by approximately 50%. This means that in a pressurized condition, the gasket has the same thickness as a soft-material flat gasket with a starting thickness of 2 mm. The W1A-3 gasket can also be used with flanges conforming to DIN 2526 Form C. To avoid contact between the medium and the graphite layers, the corrugated ring gasket is also available with an eyelet ring made of 1.4571, Profile W1A-3•F1. Gaskets that conform to works standard 188 and/or works standard 189 in accordance with DIN 2690 have an external parallel center ring onto which the corrugated ring material, the nominal width, the nominal pressure, and the manufacturer’s mark are impressed.
W1A-3F1 Gewellte Dichtung W1A-3F1 As the external diameter of the layers is approx. 8 mm smaller than the corrugated carrier, this identification area is always visible. Due to their soft plastic layers, these gaskets conform easily to flange sealing surfaces. Once fitted, the layers are pressed into the corrugation and are chambered there, resulting in the creation of an extremely elastic sealing element due to the pressure, with a leak rate that is significantly lower than with traditional graphite flat gaskets. Profile W1A-3 has been tested in accordance with VDI 2440 and fulfils the criteria of the TA Luft type test. The blow out security of Profile W1A-3 was tested, demonstrated, and documented by the Amtec Institute on specimens at a temperature of 400°C. The geometry of the corrugated ring gasket ensures high stability in the seal, making it particularly easy to handle. Fulfilment of the “Fire Safe” requirements of ISO 10497 has been demonstrated by tests in accordance with API 607 and is confirmed with the relevant certificate.
W11A Gewellte Dichtung W11A Gaskets with an unlined central edge are marked as Profile W11A.

 

W2A Gewellte Dichtung W2A
For large sealing diameters above DN 1200 we recommend that gaskets of either Profile W2A or Profile W12A be used. These gaskets are fitted with a stabilizing ring as well as a W1A seal on both sides, making them very inherently stable with a greater ability to conform to the surface of the flange.
W12A Gewellte Dichtung W12A
The gaskets can also be provided with an F1 external eyelet, such as in e.g., Profile W1A-3·F1.
Profile Techn. Anforderung 1.4541 & Graphit 1.4541 & PTFE 1.4571 & Graphit 1.4571 6 PTFE
W1A, W11A Recommended max. roughness of the flange surfaces µm von 25 50
bis 50 100
Surface pressure limits for 20 °C N/mm² σv 15 15
σϑ 180 180
Surface pressure limits for 300°C N/mm²ơ σv 20
σϑ 150
W1A-3 Recommended max. roughness of the flange surfaces µm von 25 50
bis 50 100
Suositeltu max. laipan pintojen karheus N/mm² σv 15 15
σϑ 200 200
Surface pressure limits for 300°C N\mm2 ơ σv 20
σϑ 150

 

 




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