Marine / Ship Seals
- Fully split designs
- Rudderstock Seals - Stern Tube Seals - Bulkhead Seals
- Air Control Panels - Water Control Panels
- Filtration Systems - Pre-Filtration Systems
- Complete Manufacturing In-house
Our axial type seals are specifically designed for application to stern tube seals, hydroelectric turbines and large water pumps for sewage handling, filtration, irrigation, and more.
Our axial type seals are self-aligned, balanced split face seals capable of withstanding the heavy torques, pressures, shaft movements (radial and axial) and thrusts associated with such shaft systems. Depending on the operating conditions, many custom arrangements can be used.
The sealing action takes place between two mating rings, one stationary, the Sealing Ring, the other rotating with the shaft, the Seat Ring. The axial direction of the sealing action prevents damage to the shaft, since the wear is taking place between the Seat and the Sealing Rings, and not on the shaft.
The Sealing Ring is held in contact with the Seat Ring by a spring force and the hydraulic force of flushing water. These properties balance the seal at all times.
A flow of clean water, free of abrasive particles must be maintained throughout the seal, to provide cooling, lubrication and to reduce wear of the sealing surfaces. Water should be filtered to ensure that impurities larger than 50 microns are removed, in order to prevent abrasive particles entering from under the seal and or the stern tube. The clean water supply must be at a higher pressure than the water pressure from the stern tube. It is recommended to install an automatic differential pressure system with the water supply, maintaining a constant pressure difference above that of the pressure of the stern tube.
On certain models of our seals, the water is injected directly between the mating faces. By controlling the seal water flow in the annular profile between the faces provides the benefits of a double seal since it allows control of the sealâs environment through cooling, lubricating and cleansing, as impurities are prevented from entering in between the mating faces.
All of our seals include an assembly kit (consisting of: eyebolts, jacking screws and he keys for use during assembly or disassembly of the housing parts), an O-ring splicing kit, flange sealant, silicon grease, a piping connection identification plate and three copies of the installation, maintenance and operation manual.
In order to regulate the pressure differential between the shaft seal and the stern tube, a seal water control panel complete with an automatic differential pressure regulator can be supplied with each seal. The positive pressure differential is necessary to prevent abrasive particles from entering the seal faces.
|Maximum operating pressure: ||50 PSI â (1020 kPa) |
|Maximum shaft speed: ||90 f/sec. â (30 m/s) |
|Barrier water pressure: ||5 - 10 PSI â (35 - 70 kPa) above draft operating pressure |
|Barrier water filtration recommended ||50 microns (non-abrasive) |
|Maximum shaft diameter: ||39" â (1000 mm) |
|Maximum radial shaft movement: ||0.125" â (3 mm) |
|Maximum axial shaft movement: ||1.0" â (25.4 mm) |