SEALING SYSTEMS Sealing Solutions For Rudder Shafts
LIP SEALS Lip Seals are used when the use of a tube is not possible. A typical situation is when the tiller lever or quadrant is located just above the bottom bearing. For security, we recommend always using two Lip Seals. To achieve a good seal it’s important that the contact area of the rudder shaft has a very smooth surface. It is not possible to use lip seals in combination with self-aligning bearings except for our standard self-aligning bearing where the seals are mounted in the inner housing and move with the deflection of the shaft. Always use Jefa special PUR Lip Seals. They are specially developed for rudder sealing purposes and contain no metals. When industry lip seals are used, they will have to be replaced every 2 years as the rubber will develop porosity and corrode the steel reinforcement ring inside the seal which results in a leaking rudder system.
GAITER SEALING SYSTEM The tube and Gaiter Sealing System is the most efficient method of providing a seal. The friction is almost zero, the sealing is 100% sure, and the gaiter will allow the shaft to rotate and bend freely. The system consists of an aluminum tube, which is bonded to the lower bearing and to which is clamped via a stainless-steel hose clamp, a neoprene gaiter. The top end of the neoprene gaiter is clamped to the rudder shaft by a second hose clamp. The gaiter is made to allow up to 90º of rudder travel (± 45º), without causing inelastic extension to the gaiter. It is desirable to take the rudder tube as high as possible for water security and must be at least 100mm above the waterline. The gaiter is in fact 100% waterproof and will show no signs of wear, even after many years of service. However it is possible for this to become mechanically damaged or torn, if materials are stored loosely in this area of the yacht. Please avoid direct sunlight on the gaiter as the UV light will damage the neoprene in time.
PSS RUDDER SEAL The sealing system is one of the most important parts of the rudder system. A leaky sealing system is irritating and dangerous. The PSS Shaft Seal is a great solution as it offers ultimate reliability for rudder seals due to the simple design. Available for 3/4” to 6” (20mm to 150mm) shaft diameters. Service parts are available from stock.
More PSS Rudder Seal information on page 9.
TO ORDER VISIT WWW.PYIINC.COM OR CALL 425-355-3669
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JEFA RUDDER SEALING SYSTEMS |
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