PSS Type A – Mechanical shaft seals
PRICE
From $ 300 to $ 2650 USD
FEATURES
This packing-free mechanical seal is a flat face seal that creates a mechanical seal between a dynamic stainless steel rotor and a stationary carbon stator.
The carbon stator is connected to a corrugated rubber bellows and the backside of the bellows is connected to the shaft’s horn tube by metal clamps.
During installation, the stainless steel rotor is used to compress the corrugated rubber bellows. Once compressed, the rotor is secured to the shaft. Compression of the bellows allows the seal faces to maintain constant contact, while compensating for axial movement fore and aft of the shaft caused by the thrust of the propeller on the motor’s anti-vibration mounts.
The inner diameter of the carbon stator is slightly enlarged in reference to the outer diameter of the shaft, allowing it to “float” around the shaft and compensate for misalignment and vibration of the installation.
The stainless steel rotor is sealed to the shaft with nitrile rings. These rings rotate with the shaft and rotor suppressing wear during operation.
This static ring seal allows PSS mechanical seals to be installed on shafts that already have a certain degree of wear or pitting, unlike lip seals that require an absolutely imperfection-free surface for installation and optimum operation. This type of carbon stator is not as sensitive to cooling water flow interruption or operation in dirty water compared to other mechanical seal options on the market.
Sold by consultation. Prefer to talk to an advisor? 1(805)459-3568
BENEFITS:
This seal satisfies the requirements for pleasure craft and smaller commercial vessels.
OPTIONS
A cooling water hose connection is recommended for boats with speeds above 10 knots.
An additional shaft retaining collar can be installed to protect this component. This component helps to keep the shaft inside the boat in the event of coupling failure or breakage. Due to its simple design the CRE is easy to install with the shaft in place. Available for shafts from 1″ (25mm) to 3″ (80mm) in diameter.
DIMENSIONS AND SIZES:
¾” (20 mm) to 3 ¾” (95 mm): shaft diameter.
1 ¼” (30 mm) to 6″ (152mm): Stern horn diameter
6″ (152mm) to 9.863″ (250mm): Approximate compressed length.
MATERIALS:
5 to 225 F (-15 c to 107 C): TEMPERATURE LIMITS.
15 PSI (1 BAR): PRESSURE LIMITS
10,000 RPM: SHAFT RPM’S LIMIT
LAPPED TO 4 HLB (0.000044″ TOLERANCE) CARBON GRAPHITE
FACED TO 9 Ra: STAINLESS STEEL 316 S
MOLDED NITRILE: RUBBER BELLOWS MATERIAL
What makes this product special?
The PSS Type A mechanical seal is an extremely high quality product proven worldwide, with more than 200,000 units currently in operation around the world.
A large number of commercial vessels have logged over 40,000 (4-½ years of continuous operation) hours on engines using the same original components…
52 reviews for PSS Type A – Mechanical shaft seals
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Related products
Adapter set T
PRICE
From $51 to $56 USD. Specific dimensions, references, and prices according to the table.
FEATURES:
PYI offers Kits-T to help facilitate the installation of the PSS mechanical seal. These Kits-T allow the installer to derive a T from the sea water discharge line and supply water through a hose connector to the PSS mechanical seal.
Retention collars for shafts
PRICE
From $20 to $220 USD.
FEATURES
The Shaft Retention Collar (SRC) is designed to protect propeller shafts and rudders. It helps keep the shaft and rudder inside the boat in case of a coupling failure. Thanks to its simple design, the SRC can be easily installed with the shaft or rudder in place. Available to fit shafts from 1" to 3" or 25 to 80mm.
Maintenance kit
PRICE
From $92 to $1160 USD
FEATURES
To ensure the longevity and proper functioning of the PSS seal, PYI supplies PSS service kits to meet the requirements of the preventive maintenance plan. As with any rubber/silicone hose below the waterline, PSS bellows should be inspected periodically for signs of wear, age or chemical deterioration. PYI recommends replacement of the bellows once every 6 years (For Type A seals) and 8-10 years (For Type B and PRO seals). During bellows replacement it is also recommended that the O-rings and set screws on the stainless steel rotor be replaced, as well as the clamps. PYI includes all necessary components and parts in its PSS maintenance kits.
PSS type B
PRICE
FROM $ 4600 TO $ 6650 USD
CHARACTERISTICS
FOR LARGE COMMERCIAL VESSELS, WITH SHAFTS FROM 4" (100 MM) TO 6" (150 MM) DIAMETER.
COMMERCIALLY PROVEN FOR OVER 20 YEARS. THIS SEAL IS THE WORKHORSE OF THE COMMERCIAL MARINE INDUSTRY.
STEEL REINFORCEMENT RINGS FOR CORRUGATED RUBBER BELLOWS. STANDARD FOR 4" (100 MM) DIAMETER SHAFTS OR LARGER.
TYPE B SEALS USE 316S STAINLESS STEEL TYPE T CLAMPS WITH SCREW.
Download file
PSS Pro seal
PRICE
From $ 425 to $ 3130 USD
CHARACTERISTICS
For commercial vessels, with shafts from 1 ¼" (32 mm) to 3- 3/4" (96 mm) diameter.
Manufactured with the concept of application in workboats.
Steel reinforcement rings for corrugated rubber bellows. Standard for 2 ¼" (60 mm) diameter shafts or larger.
Pro seals use 316s stainless steel clamps with rolled ends and non-perforated bands.
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