Non-Contacting Lift-Off Seal
Non-Contacting Lift-Off Seal
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Qualiseal® Radial Shaft Seal
Qualiseal® Radial Shaft Seal
In certain extreme applications, a part made of individual segments may meet your critical performance requirements better than a single-piece unit.
QUALISEAL® CONTROLLED GAP/BUSHING
Really two pieces in one, Qualiseal® Controlled Gap/Bushing seals are the best solution when pressure is an issue.
Controlled gap or bushing seals are comprised of a carbon insert that is shrink-fitted into a separate retaining band. This floating circumferential ring assembly grows at a rate similar to that of the shaft when exposed to elevated temperatures.
Under normal operating conditions, the pressure on the airside is higher than the pressure on the oil side. This creates some air leakage through the controlled gap between the carbon ring and shaft. The differential air pressure, along with the spring load, provide the closing force necessary to maintain contact between the carbon and housing secondary sealing face. Meanwhile, the shaft turns freely within the carbon ring.
The seal design also features a unique stabilizer ring with fins which minimize stress on the carbon ring, thereby maintaining the roundness of the circumferential ring assembly. The dimensional tolerance of the critical inside diameter of the bushing ring is tightly controlled to minimize leakage variations.
Product Applications
- Aerospace Industry
- Industrial Industry
Ideal For:
- High-pressure applications
- Also suitable for sealing low-pressure liquids
Features & Benefits
Benefits:
- Minimal leakage in an exceptionally wide temperature range
- Tolerance to unlimited shaft axial movement
- Very long life
- Very low heat generation
Features:
- Rides on a buffer that centers the ring and minimizes seal-to-shaft contact
- Available in a wide variety of materials suitable to a broad range of applications
- Often paired with other seals to create sealing systems that meet demanding requirements
Design Configurations:
- Single seal for dual pressure conditions
- Spring-loaded double back-to-back seal
- Separable designs to facilitate replacement and/or rework of internal components
- Double tandem seal arrangement for sealing a combination of liquids and gases
- Multiple labyrinth ring assemblies
- Housing for mounting directly onto equipment case
QUALISEAL® SEGMENTED SEALS
Segmented seals ride directly along the shaft and are primarily used in low-pressure applications.
These seals contain a series of segmented carbon rings which contact the shaft or rotor. Segments inside the seal housing are kept in the proper location by anti-rotation keys or pins. A secondary seal is formed by the axial spring loading of the seal rings against the internal surface of the housing face. During movement, a continuous seal is always in contact with either the primary or secondary sealing surfaces.
Product Applications
- Aerospace Industry
- Industrial Industry
Ideal For:
- Gas seals and for sealing low-pressure liquids
Features & Benefits
Benefits:
- Tolerance to unlimited shaft axial movement
- Prevents oil and contaminant migration into the process gas side
- Leakage rates remain constant over the life of the seal
Features:
- Rides directly along the shaft
- Special gap segments permit the seal to adjust dimensionally for minimal leakage
- Compression and garter springs ensure that segments remain in contact with mating surfaces during low delta pressure and shutdown conditions
Design Configurations:
- Various seal ring segment configurations
- Pressure-balanced segments
- Fractured rings
- Multiple seal labyrinth
- Internally pressurized seal
- Internally vented seal
Specifications
Resources
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How a Metal Seal Works
How a Metal Seal Works
Machined Metal Seals Catalog
Machined Metal Seals Catalog
HELICOFLEX® Resilient Metal Seal
HELICOFLEX® Resilient Metal Seal
The HELICOFLEX® seal is a high performance, flexible metal seal that has exceptional compression and elastic recovery properties. This seal is composed of a close wound helical spring surrounded by one or more metal jackets. The spring is designed to have a specific compression resistance. During compression, the resulting specific pressure forces the jacket to yield and fill the flange imperfections while ensuring positive contact with the flange sealing faces. Each coil of the helical spring acts independently and allows the seal to conform to surface irregularities on the flange surface.
HELICOFLEX® design flexibility allows Technetics engineers to customize the seal characteristics to match each unique application.
Features & Benefits
- Highest sealing level performance on the market, depending on the sealing load, the surface finish, and the surface treatment
- Excellent corrosion resistance
- Wide range of materials: from standard to specific and/or rare
- Special materials on demand for coatings: wide range of materials available, from standard to specific and/or rare (see details below in “Specifications” section)
- Extended lifetime and more
- Excellent radiation resistance
- Compatible with NACE MR 0175
- Ø 4 to 8000 mm
- Ø 1,5 to 40 mm cross-section
- Adaptable to all types of sealing surfaces (triple faces, radial, shaped, and more)
- Adaptable to all standards flanges (PNEUROP, ANSI, ISO, and more)
Product Applications
- Nuclear: reactor pressure vessels, control rods, primary pumps, pressurizers, spent fuel casks, transportation casks
- Valves: body/bonnet sealing, seat sealing
- Oil and gas: hydraulics, subsea couplings, subsea Christmas trees, subsea compressors, electronic submersible pumps, flow meters
- Life sciences: imaging & scanning systems
- Ultra-high vacuum: accelerators & fusion research
- Semiconductor chamber, exhaust and other applications in PVD/CVD/etch and lithography processes
- Gas/chemical delivery systems
- Automotive: engine, exhaust gas
Specifications
Resources
HELICOCARB – German
HELICOCARB – German
HELICOCARB – English
HELICOCARB – English
HELICOCARB – French
HELICOCARB – French
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