Seal

A hydraulic seal arrangement for a rotating machine comprising:

• first and second relatively rotatable components, the first component defining a first annular trough defined by radially inwardly extending axially spaced first and second walls, the second component defining a radially outwardly extending web extending between the radially inwardly extending walls of the first component;
• the first component further comprising:
• a second trough defined by the radially inwardly extending second wall and a radially inwardly extending third wall axially spaced from the second radially extending wall, the second trough defining an open radially inner end defined by a radially inner end of the second radially extending wall such that the first and second annular troughs fluidly communicate around substantially the whole circumference of the first component via the radially inner end of the second radially extending wall;
• wherein
• at a first circumferential position, the second radially inwardly extending wall of the first component defines a second trough oil inlet providing fluid communication between the first and second annular troughs;
• and
• at a second circumferential position, the third radially extending wall of the first component defines a second trough oil outlet.