Dripless Seals

SureSeal Shaft Seals - Standard

SureSeal™ Drip Free Self Aligning Propeller Shaft ...

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SureSeal Shaft Seals - Standard
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SureSeal™ Drip Free Self Aligning Propeller Shaft Seals Manufactured by Tides Marine. Deep Blue Yacht Supply stocks the complete inventory of standard imperial Tides Marine SureSeals. Housing Made from fiber-reinforced composite material, the housing is strong, durable and compact. The SureSeal® is dimensionally unaffected by temperature and will... Prices Starting At: $192.98

SureSeal Shaft Seals - Metric

Tides Marine SureSeal™ Drip Free Self Aligning Pro...

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SureSeal Shaft Seals - Metric
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Tides Marine SureSeal™ Drip Free Self Aligning Propeller Shaft Seals Manufactured by Tides Marine. Housing Made from fiber-reinforced composite material, the housing is strong, durable and compact. The SureSeal® is dimensionally unaffected by temperature and will not absorb water. Bearing The integral PTFE® bearing extends the operating life of t... Prices Starting At: $273.73

PYI Dripless Shaft Seals - Standard

The PYI PSS Shaft Seal Packless Sealing System is ...

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The PYI PSS Shaft Seal Packless Sealing System is a dripless stuffing box and packing gland replacement for sailboat and power boat drivetrains. The PYI dripless shaft seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal with proven reliability. This packless seal will eliminate shaft wear ... Prices Starting At: $216.99

PYI Dripless Shaft Seals - Metric

The PSS Shaft Seal Packless Sealing System is a dr...

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PYI Dripless Shaft Seals - Metric
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The PSS Shaft Seal Packless Sealing System is a dripless stuffing box and packing gland replacement for sailboat and power boat drivetrains. The dripless shaft seal is a mechanical seal that uses a self-aligning carbon-graphite stator to ensure a 100% watertight seal with proven reliability. This packless seal will eliminate shaft wear and mini... Prices Starting At: $208.99

PYI Dripless Shaft Seals Maintenance Kits

PSS Shaft Seal maintenance & parts replacement Kit...

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PYI Dripless Shaft Seals Maintenance Kits
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PSS Shaft Seal maintenance & parts replacement Kit: As with any rubber hose below waterline, the PSS bellows must be inspected on a regular basis for any sign of wear, aging or chemical deterioration. PYI suggests preventative maintenance. The PSS bellow should be replaced in six year intervals. During bellows replacement it is recommended the o-r... Prices Starting At: $64.99

For boat owners world-wide, Deep Blue Yacht Supply is your trusted source for all sizes of genuine PYI PSS Dripless Shaft Seals. We are committed to providing the best marine shaft seals, at the lowest prices; with ultimate customer service.

Deep Blue Yacht Supply has the largest inventory of Marine Shaft Seals; you will be sure to find the proper dripless seal for your application. Deep Blue Yacht Supply carries the full line of marine shaft seals, including inch and metric size as well as the maintenance kits.

A PSS shaft seal is a mechanical seal installed between a flat carbon or composite carbon and graphite surface (flange) and a rotating surface, usually a stainless steel rotor which turns with the shaft. The acronym PSS stands for "packless sealing system". PSS shaft seals are manufactured by a number of companies, usually for use in a marine environment as the propeller shaft seal or the rudder post seal on sailboats, power boats, and commercial vessels. These shaft seals have been in use in boating for thirty years. Recently, PSS shaft seals have made their way into other commercial venues including use in mixing tanks for fruit juice, tomato paste, and even cardboard glue. A new industry has also sprouted up using the PSS seal in indoor swimming pools. Pools that are primarily used for physical therapy have widely adopted the PSS shaft seal, as well as sports training pools at universities. PSS shaft seals are even entering use today in the mining industry for pumps and in irrigation. PYI PSS dripless shaft seals are the industry leader when it comes to expanding the use of PSS shaft seals into new markets.

PYI PSS dripless shaft seals are considered industry standard equipment. They are now used by most of the world's biggest shipbuilders and boatyards. They are also relied on as the most stable seals for aftermarket retrofitting. PYI seals are certified by independent, reputable organizations. Shipbuilders and boatyards routinely opt for PSS because it reduces the cost, maintenance, and continual adjustment that come with using old-fashioned packing-type glands. Furthermore, PSS shaft seals work to keep water out of the bilge and reduce wear to the propeller shaft. Most discerning ship builders and boat yards use PYI dripless shaft seals, including Alden Yachts, Azimut, Donzi Yachts, Catalina Yachts, Ferretti, Hinckely Company, M.B. Sports, Meridian Yachts, Menorquin Yachts, Pacific Seacraft, Rybovich-Spencer, Tiara, Tige, Topaz Boats, Wellcraft, and many more.

A PSS mechanical shaft seal is made of special components. The high-density carbon/graphite flange is machined to possess the perfect shape and size. As part of its design, the flange will polish the rotor face in the first few minutes of initial operation. This process helps create the perfect seal. No spray guard is required as a result. The composite carbon/graphite material not only lasts longer, but sustains a maximum temperature of 500° F. Under normal conditions, the flange never needs to be replaced. O-rings are put inside the rotor to protect the seal of the rotor to the propeller shaft and to ensure alignment. The rings do not move and do not wear. The stainless steel rotor (Type 316) is locked to the propeller shaft with high-quality double set screws. Computer-controlled lathes provide for precision tolerance. These rotors are passivated to the highest military standard to provide maximum corrosion resistance. The set screws used are Allen head set screws, which are carefully worked into the rotor and then secured tightly to the propeller shaft. A backup set screw is threaded into each hole to prevent the first screw from working its way back out. Dri-Loc 204 is used on all set screws. At the stern tube and at the flange ends, two stainless steel hose clamps secure the bellow. The bellow's stern tube part is available for purchase in standard sizes in quarter-inch increments. The diameter of both the shaft and the stern tube must be specified when ordering.

PYI PSS dripless shaft seals distinguish themselves in the quality of their manufacture. Many mechanical seals appear to be quite similar. PYI shaft seals, however, make a world of difference. PYI PSS shaft seals are available for shafts in a variety of sizes from 3/4" (20mm) to 6" (150mm). PYI offers PSS small shaft seals, PSS large shaft seals, and PSS rudder post seals. PYI provides installation instructions and demonstration videos at its website.

The Best Marine Shaft Seals

One of the most important elements in a boat propeller system is the shaft seal.  Marine shaft seals are a mechanical seal created when a surface in circular motion turns against an unmoving surface.

Packless Sealing System Shaft Seals

PSS shaft seals are a specific kind of seal that use a carbon flange as the stationary element held against a turning rotor made of stainless steel.  The rotor turns along with the propeller shaft.  These seals are superior to other kinds because they leverage water pressure in order to maintain continuous contact between the stainless steel and the carbon.  This results in a seal that is completely watertight even when the boat motor is producing heavy vibrations.

Another advantage of the PSS shaft seal is that it needs no maintenance to stay watertight.  Boating enthusiasts recognize the inherent benefit in boat parts that can be installed once and thereafter work as intended without requiring periodic lubrication or other kinds of assistance.  This maintenance-free aspect of PSS shaft seals is due in part to the use of O-rings made of nitrile.  O-rings are circular rings that are manufactured as a seamless whole, with no cracks or gaps, making them less likely to fail than rings that have even a microscopic seam joining them together.

The Advantage of Nitrile

The nitrile material is long lasting and has proven to be resistant to various kinds of damage.  Unlike rubber or latex, for example, nitrile will not degrade in the presence of petroleum products.  Neither is it susceptible to damage from variations in temperature.

PSS Shaft Seals: Advantages

Among marine shaft seals, no other type sells better across the world than PSS shaft seals.  These marine mechanical seals are even included by default by many of the world’s finest boatyards, whose expert craftsmen consider them to be standard equipment.  PSS stands for “Packless Sealing System,” which is an excellent description of the technology that makes these seals so exceptional.  These marine shaft seals function without as much constant attention as other kinds of sealing systems.  In particular, PSS marine shaft seals do not need to be adjusted often and they free boating enthusiasts from the need for frequent maintenance.

In addition, a PSS Shaft Seal is completely watertight, which means that water will not accumulate in the bilge.  This feature also helps to cut down on wear and tear to the shaft of the propeller so that boating enthusiasts can enjoy a trouble-free watercraft experience for a long while to come.

PSS Shaft Seals are simple to install, even in retrofit situations, and can fit shafts as small as ¾ inch and as large as six full inches or 150 mm across.  In essence, the PSS marine shaft seal consists of a face seal between the two flat surfaces provided by a carbon flange, which remains stationary, and a rotor, which rotates.  The shaft seal serves to compensate as the propeller produces thrust.  This helps to eliminate not just problems caused by vibration, but also those that are a result of small misalignments.  A key part of these seals is the use of O-rings that rotate along with the shaft so that they will not wear down over time.

Parts of a Marine Shaft Seal: The Flange

Boating enthusiasts with more than a casual understanding of their boats and motors know that marine shaft seals play an essential role in helping a propeller do its job to full capacity. PSS shaft seals are comprised of several components that require engineering to exacting specifications so that the system works as intended.

The Flange

High quality marine shaft seals feature a flange made of carbon fabricated to have a high density. Some PSS shaft seals are advertised as having flanges made of “graphite” instead, but this term simply refers to a particular crystalline structure of the element carbon. When installed, the face of this carbon or graphite flange will rub against the rotor face of the shaft seal when the propeller is first switched on. This is by design, not coincidence; the rubbing action guarantees that a flawless seal will be established.

This aspect of the flange explains why “high density” carbon is so important. The rubbing action will quickly wear away or damage the flange itself if it is made of material that is not extremely hard and durable. Flanges made of high-density carbon or graphite have excellent wear resistance and can perform their duties for a long time. In addition, the carbon helps to prevent overheating incidents inside the shaft seal, as carbon can withstand temperatures as high as 400 degree Fahrenheit. When flanges are made of cheaper materials, such as synthesized plastics and their derivatives, overheating can become a real concern.

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