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Marine propulsion

The effective sealing of rudder stocks and posts is particularly demanding as side loads can be extremely high and eccentricity of shaft movement is frequently encountered. James Walker solutions to these challenges are appreciated by major steering gear manufacturers and are outlined in the following sections.

• Rudders
Our standard recommended arrangement for rudder stocks and posts incorporates  Walkersele® D7 or Walkersele® D8 profile seals in a back-to-back configuration.

In cases where high shaft eccentricity is anticipated special designs are available, including Walkersele® D6 variants with extended flexible lips.

• Actuators
Steering gear actuation mechanisms vary widely and are often hydraulically operated.

James Walker is able to offer an extensive range of hydraulic seals to suit any particular regime and set of operating conditions.

• Blade seals
The choice of seal for the base of the blade of controllable pitch (CP) propellers is dependent on the orientation required. James Walker is able to offer face seal designs such as ‘O’ rings, X-section rings, ‘D’ seals and sponge filled profiles which afford resilience combined with ease of compression.

Radial options are normally based on our proven Solosele® KB concept, originally developed for Kaplan turbine blades for the hydroelectric industry. These options are also suitable for on-site joining if required, thus minimising down-time for seal replacement.