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    Single seal
    Independent of direction of rotation
    Multiple springs stationary
    Seat rotating
    Seat arranged directly behind the impeller
    Spring protection sleeve
    Variant with cylindrical spring and acc. EN 12756 (HRZ1) available
    Variant as cartridge with/without guide sleeve for application with/without quench (HR2, HR3)
    Dual seal as cartridge unit (HRKS-D) available


    Especially for application in solids containing media without external flush or internal product circulation. Solids content 40 % (single seal) and 60 % (double seal)
    Operation under vacuum without seat locking possible
    Pumping screw for increased circulation available
    Springs are protected from product and leakage


Operating range
Shaft diameter:
dN = 36 ... 270 mm (1.4" ... 10.63")
Pressure: p1* = 16 bar (230 PSI)
t = -20 °C ... +160 °C (-4 °F ... +320 °F)
Sliding velocity: vg = 10 m/s (33 ft/s)

* For operation under vacuum it is necessary to arrange for quenching on the atmosphere side.

Seal face: Silicon carbide (Q1, Q2)
Seat: Silicon carbide (Q1, Q2)
Standards and approvals

    EN 12756

Recommended applications

    Process industry
    Oil and gas industry
    Refining technology
    Chemical industry
    Power plant technology
    Pulp and paper industry
    Water and waste water technology
    Mining industry
    Sugar industry
    Cement industry

    Contaminated, abrasive and solids containing media

    Sewage water pumps
    Dredger pumps
    Oil sand extraction
    Suspension pumps of flue-gas desulphurization plants (FGD)

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