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WASY FKM

Rotary shaft seal same as type WA FKM in the Y model, pressurisable. It has a shorter, more stable, spring-energised sealing lip. In addition, this design is available with a protective lip (WASY FKM) on the air side.

Description
Product group: Rotary shaft seal
Design: A = outer surface rubber-coated
Model: SY = sealing lip and protective lip pressurisable
Seal material: FMK 80
Colour: brown
Stiffening ring: non-alloy steel according to DIN EN 10139
Tension spring: non-alloy spring steel according to DIN EN 10270-1

Areas of application
Sealing of rotating machine elements such as shafts, hubs and axles when pressurized. The main application lies within the area of pressurized units e.g. pumps and hydro-electric engines.

Function
The WASY FKM is a single acting shaft seal for rotating or pivoting shafts with optional protective lip sealing action (WASY FKM) on the side facing away from the medium against dirt accumulation from the outside. Pressure application of up to 10 bar (depending on the rotational speed) is possible due to the shorter, thicker, spring-energised sealing lip. The elastomer outer sheath provides good static sealing, good thermal expansion balance e.g. in light-metal housings, better sealing with greater roughness and secure sealing for split housings as well as good static sealing with thin fluid or gaseous media. FPM is superior to the NBR materials for high temperature applications, high peripheral speeds and chemically aggressive media.

Media
Mineral oils and greases, synthetic oils and greases, engine, gear and ATF oils, fuel, aromatic and chlorinated ­hydrocarbons, broad chemicals and solvents resistance.

Operational application limits
Pressure (MPa/bar): ≤ 10 bar ­depending on the rotational speed
Temperature (°C): -30 to +200
Peripheral speed (m/s): ≤ 10

Installation
Suitable tools should be used for installation. It is recommended that the installation housing is designed to provide the rotary shaft seal with axial support.

Remarks
The nominal widths mentioned on the following pages represent the standard dimensions. They are generally in stock or can be delivered at short notice. Other dimensions and different designs, e.g. springs or metal inserts made of other steel grades can be produced as well as some special designs. Minimum quantities may be obligatory for dimensions outside of the standard.