Seals according to DIN 3869

The profile gaskets according to DIN 3869 provide axial static sealing of the threaded joints. There are threaded joints in pipe fittings, in valves or in plugs and boxes, among other examples. The tightening of the threaded joint causes the elastomer profile (easily deformable) to press inwards, achieving sealing between the surfaces to be sealed. The profile gasket is designed to prevent leakage of the fluid to the outside, thus avoiding a loss of pressure. In addition, its peculiar geometry avoids twisting during assembly and in its housing once installed, prevents the ingress of dust and dirt and also, with a minimum mechanical deformation of its section.

Applications

Profile gaskets are used in many general industry services, such as:

• - Pipe fittings.
• - Construction machinery.
• - Agricultural machinery.
• - Hydraulic presses.
• - Molding and injection molding machinery.
• - Valves.
• - Gas devices and equipment.

Dimensions

The dimensions currently available can be consulted in the online store of Dichtomatik.

Advantages and benefits

• - Reusable gasket.
• - Small mechanical deformation under load.
• - No twisting in the housing.
• - Easy handling during assembly.
• - Low probability of forming a lip by extrusion of the joint.
• - In the event of a pressure pulse, the seal remains immobile in its housing.
• - Low leakage even with low and medium viscosity fluids.
• - Minimal deformation of its section.
• - The profile seals made of NBR are suitable for service in gas devices and equipment according to EN 549 B1/H3 (0 °C to +80 °C).
• - Profile seals made of FPM are suitable for service in gas devices and equipment according to EN 549 E1/H3 (0 °C to +150 °C).

Assembly and housing

Any damage to the profile gasket during assembly must be avoided (scoring, scratches, indentations, etc.), otherwise the sealing effect will not be as good as possible. Dust, dirt, metal shavings or other foreign bodies must be removed from the profile seal housing. It is essential to ensure the correct mounting position. The threaded ends must be covered using an assembly tool. Mounting tools must be made of a soft material (e.g. POM) and without sharp edges. For assembly purposes, neither the profile gasket nor its housing must be greased. The housing and surface finish must be according to DIN 3852 part 11. Other housings according to ISO 1179, ISO 9974-2, ISO 9974-3 and ISO 11926 can also be used.

1. • Hot water and steam.
   • Alkaline detergents, soda and potash.
   • Silicone oils and greases.
   • Polar solvents.
   • Diluted acids and other chemical products.
   • Good ozone resistance.

Incompatible with oils and greases of mineral origin.

2. • Oils and greases of mineral origin, synthetic oils and greases.
   • Engine oils, transmission fluids, ATF oils up to +150 ºC and fuels.
   • Flame resistant HFD hydraulic fluids.
   • Aromatic, aliphatic and organochlorinated hydrocarbons.
   • DIN EN 549 E1 / H3 certification (0 ºC to +150 ºC).
   • Water up to a maximum temperature of +80 ºC.
   • Very good resistance to weathering, ozone and aging.
   • Very low gas permeability (suitable for vacuum applications).
   • Broad chemical resistance.

Incompatible with hot water, steam, polar solvents, glycol-based brake fluids and low molecular weight organic acids.

3. • Oils and fats of mineral origin.
   • H, HL and HLP hydraulic fluids.
   • Flame resistant hydraulic fluids.
   • Hydraulic fluids HFA, HFB and HFG up to +60 ºC.
   • Certification DIN EN 549 B1 / H3 (0 ºC to +80 ºC).
   • Water up to a maximum temperature of +80 ºC.

Incompatible with aromatic hydrocarbons, organochlorines, fuels with high aromatic content, polar solvents, glycol-based brake fluids and flame-resistant HFD hydraulic fluids.