Allpa PSS Mechanical Dripless Propeller Shaft Seal for Inboard Shafts Ø22–95 mm

Name: Allpa PSS Mechanical Dripless Propeller Shaft Seal for Inboard Shafts Ø22–95 mm
SKU: ALP 9036222114

SKU: ALP 9036222114

ID 1416430

$ 621.44

1-2 weeks delivery time

Shaft Diameter:

Stern Tube Diameter:

6"
1 1/2"
1 1/4"
1 3/4"
2 1/2"
2 1/4"
2 3/4"
2"
3 1/2"
3 1/4"
3 3/4"
3"
4 1/2"
5"

Allpa PSS mechanical axial propeller shaft seals for water-lubricated inboard marine propulsion systems, available for shaft diameters from 22 to 95 mm and stern tube outside diameters from 31.8 to 152.4 mm. The dripless, packing-free design combines a stationary carbon flange, a rotating stainless steel ring, a flexible oil- and grease-resistant rubber bellows, dual locking screws and internal O-rings. Features a 10 mm cooling water connection and installation lengths from 158 to 248 mm. Temperature range: -70°C to +220°C. RINA, ABS and Bureau Veritas certified.

Description
Ask a Question

Allpa PSS Mechanical Dripless Propeller Shaft Seal for Inboard Shafts Ø22–95 mm

The Allpa PSS Mechanical Propeller Shaft Seal is a packing-free axial shaft sealing system developed for water-lubricated inboard marine propulsion installations. Its mechanical face seal design provides a dripless shaft sealing arrangement without traditional stuffing box packing.

The seal consists of a stationary carbon flange and a rotating stainless steel ring. The carbon flange is pressed against the stainless steel ring by the compression of a flexible rubber bellows, maintaining contact between the sealing surfaces.

The stainless steel ring rotates with the propeller shaft and is secured by double set screws. Internal O-rings provide sealing between the ring and the shaft. The broad contact surface helps maintain sealing contact even when the propeller shaft vibrates.

The range includes 38 configurations for propeller shaft diameters from 22 to 95 mm and stern tube outside diameters from 31.8 to 152.4 mm.

Key Features

Dripless mechanical seal: Packing-free axial sealing system for marine propulsion shafts.
Carbon sealing flange: Stationary carbon face forming the mechanical sealing surface.
Stainless steel rotating ring: Rotates with the propeller shaft.
Flexible rubber bellows: Maintains contact pressure between the carbon and stainless steel sealing faces.
Double set screws: Secure the stainless steel ring to the propeller shaft.
Internal O-rings: Seal the connection between the rotating ring and shaft.
Water cooling connection: 10 mm hose connection.
Oil- and grease-resistant bellows: Flexible rubber construction.
Low maintenance: No traditional packing material required.
Temperature range: -70°C to +220°C.
Certifications: RINA, ABS and Bureau Veritas.

Technical Specifications

Parameter	Specification
Brand	Allpa
Series	PSS
Product Type	Mechanical Axial Propeller Shaft Seal
Application	Water-Lubricated Inboard Propeller Shaft Systems
Sealing Principle	Carbon and Stainless Steel Mechanical Face Seal
Stationary Sealing Face	Carbon
Rotating Sealing Face	Stainless Steel
Bellows	Flexible, Oil- and Grease-Resistant Rubber
Rotating Ring Fixing	Double Set Screws
Internal Sealing	O-Rings
Propeller Shaft Diameters	22–95 mm
Stern Tube Outside Diameters	31.8–152.4 mm
Installation Length	158–248 mm, Depending on Model
Cooling Water Connection	10 mm
Temperature Range	-70°C to +220°C
Certifications	RINA, ABS, Bureau Veritas

Available Models and Dimensions

All dimensions are in millimetres unless otherwise indicated. The stern tube diameter refers to the outside diameter of the tube, while the installation length indicates the axial space required for the selected seal.

Article Number	Shaft Ø (mm)	Tube Size (inch)	Tube Ø (mm)	Installation Length (mm)
9036222114	22	1 1/4"	31.8	158
9036222112	22	1 1/2"	38.1	158
9036225112	25	1 1/2"	38.1	158
9036225134	25	1 3/4"	44.5	158
9036230134	30	1 3/4"	44.5	158
9036230200	30	2"	50.8	158
9036230214	30	2 1/4"	57.2	158
9036232200	32	2"	50.8	165
9036232214	32	2 1/4"	57.2	165
9036232212	32	2 1/2"	63.5	165
9036235200	35	2"	50.8	165
9036235214	35	2 1/4"	57.2	165
9036235212	35	2 1/2"	63.5	165
9036238212	38	2 1/2"	63.5	206
9036240200	40	2"	50.8	206
9036240214	40	2 1/4"	57.2	206
9036240212	40	2 1/2"	63.5	206
9036240234	40	2 3/4"	69.9	206
9036245214	45	2 1/4"	57.2	206
9036245212	45	2 1/2"	63.5	206
9036245234	45	2 3/4"	69.9	206
9036245300	45	3"	76.2	206
9036250212	50	2 1/2"	63.5	206
9036250234	50	2 3/4"	69.9	206
9036250300	50	3"	76.2	206
9036250314	50	3 1/4"	82.6	206
9036250312	50	3 1/2"	88.9	206
9036255300	55	3"	76.2	206
9036255314	55	3 1/4"	82.6	206
9036255312	55	3 1/2"	88.9	206
9036260314	60	3 1/4"	82.6	216
9036260312	60	3 1/2"	88.9	216
9036260334	60	3 3/4"	95.3	216
9036260500	60	5"	127.0	232
9036270412	70	4 1/2"	114.3	235
9036270500	70	5"	127.0	235
9036280412	80	4 1/2"	114.3	235
9036295600	95	6"	152.4	248

Mechanical Face Sealing System

The PSS axial seal operates through continuous contact between two sealing faces: a stationary carbon flange and a stainless steel ring rotating with the propeller shaft.

The flexible rubber bellows applies pressure to the carbon flange, maintaining contact against the rotating stainless steel surface. This mechanical arrangement provides sealing without conventional packing material.

The stainless steel ring is secured to the propeller shaft by double set screws and sealed internally by O-rings. The broad contact surface accommodates shaft vibration while maintaining sealing contact.

Water Cooling and Bellows

The PSS shaft seal includes a 10 mm hose connection for cooling water. The flexible rubber bellows is resistant to oil and grease and provides the compression required for the mechanical sealing faces.

Installation Lengths

Propeller Shaft Diameter	Installation Length
22–30 mm	158 mm
32–35 mm	165 mm
38–55 mm	206 mm
60 mm	216 mm or 232 mm, depending on stern tube diameter
70–80 mm	235 mm
95 mm	248 mm

Selection and Installation

The correct Allpa PSS axial shaft seal must be selected according to the following dimensions:

Propeller Shaft Diameter: Measure the diameter of the propeller shaft at the sealing location.
Stern Tube Outside Diameter: Select the corresponding tube connection diameter.
Installation Length: Verify the available axial installation space.
Cooling Water Connection: Provide for the 10 mm water hose connection.

Multiple stern tube diameters are available for the same propeller shaft diameter. Verify both dimensions before selecting the appropriate article number.