Feodor Burgmann Dichtungswerke Gmbh & Co.

Andreas Schopf

Reinhard Svejkovsky

Dieter Ziegenbein

Walter Ittner

A mechanical face seal assembly for sealing a rotating member with respect to a stationary member comprises at least a pair of cooperating annular sealing elements, of which one is mountable in a non-rotating manner with respect to the stationary member and the other for common rotation with the rotating member. Between the rotating member and the non-rotating sealing element an annular space is defined, the radial dimension of which varies between a region of minimum radial dimension and a region of maximum radial dimension, which are offset circumferentially to each other. Inlet means for introducing a buffer liquid into the annular space at or near to the region having a maximum radial dimension and outlet means for discharging said buffer liquid from said annular space at or near to the region having a minimum radial dimension are provided. At least one delivery-promoting recess is formed in a portion of the rotating member oriented axially to said annular space for promoting a flow of the buffer liquid along the annular space from the inlet to the outlet means and for receiving gas bubbles released from the buffer liquid when pressurized in the annular space.

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Baierbrunn, Germany

Andreas Schopf