Abstract: The invention provides a snorkel valve (2) for controlling a flow of fluid into a deployable submarine mast, the snorkel valve comprising: a valve body (30) having: a tubular wall having an outer surface and an inner surface on the reverse side of the outer surface, the inner surface defining an inner bore (32); a valve inlet (38) extending through the tubular wall to fluidly connect the outer surface and the inner bore; and a valve outlet (40) in fluid communication with the inner bore, and a sleeve (42) slidable within the said inner bore between a closed position in which it covers the said valve inlet to thereby inhibit water from flowing into the inner bore through the valve inlet, and an open position in which at least a portion of the said valve inlet is uncovered by the sleeve to thereby allow air to flow into the said inner bore through the said valve inlet.

Abstract: Turning gear apparatus (10) for rotating a shaft (11) comprises a rotary drive arrangement (12) and a transmission system including a pivot arm (20). The rotary drive arrangement (12) is fixed, for example to a vessel hull (14), and the pivot arm (20) is pivotable between a first, shaft-disengaged, position and a second, shaft-engaged position where the rotary drive arrangement (12) is operably coupled to the shaft (11), thereby permitting control over rotation of the shaft (11) by the rotary drive arrangement (12).

Abstract: The invention provides a snorkel valve (2) for controlling a flow of fluid into a deployable submarine mast, the snorkel valve comprising: a valve body (30) having: a tubular wall having an outer surface and an inner surface on the reverse side of the outer surface, the inner surface defining an inner bore (32); a valve inlet (38) extending through the tubular wall to fluidly connect the outer surface and the inner bore; and a valve outlet (40) in fluid communication with the inner bore, and a sleeve (42) slidable within the said inner bore between a closed position in which it covers the said valve inlet to thereby inhibit water from flowing into the inner bore through the valve inlet, and an open position in which at least a portion of the said valve inlet is uncovered by the sleeve to thereby allow air to flow into the said inner bore through the said valve inlet.

Abstract: Turning gear apparatus for rotating a shaft comprises a rotary drive arrangement and a transmission system including a pivot arm. The rotary drive arrangement is fixed, for example to a vessel hull, and the pivot arm is pivotable between a first, shaft-disengaged, position and a second, shaft-engaged position where the rotary drive arrangement is operably coupled to the shaft, thereby permitting control over rotation of the shaft by the rotary drive arrangement.