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Product FlyersProduct Overview BrochureThis brochure provides a comprehensive overview of Technetics Group's product line, offering custom sealing solutions for critical industries. -
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Product FlyersQualiseal® Mechanical Seals BrochureTurn to Qualiseal® for custom-engineered mechanical sealing solutions that deliver unmatched performance for the most demanding applications. -
Product FlyersMetal Seals Master CatalogTechnetics Group is committed to providing the highest quality metal seals and sealing systems. We provide seals for use in... -
Market BrochuresAbout Qualiseal® TechnologyMeet the global leader in custom-engineered mechanical seals for demanding aerospace applications.
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.
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
Product Applications
- Aerospace Industry
- Industrial Industry
Ideal For:
- High-pressure applications
- Also suitable for sealing low-pressure liquids
Specifications
| Shaft Rotation Speeds | Temperature | Pressure | Primary Face Materials | Mating Surfaces |
|---|---|---|---|---|
| Up to 40,000 FPM (203 m/s) |
-100° F (-73°C) to over 2,000°F (1,093°C) |
Up to 100 PSIA (689.5 kPa) |
Carbon
Bronze
Silicon Carbide
Alloy and stainless steel
|
Hardened alloy and stainless steel
Hard chrome plate
Chrome oxide
Tungsten carbide
Silicon carbide
|
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.
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
Product Applications
- Aerospace Industry
- Industrial Industry
Ideal For:
- Gas seals and for sealing low-pressure liquids
Specifications
| Diameter | Shaft Rotation Speeds | Seal Ring Materials | Mating Surfaces Seal Housing |
|---|---|---|---|
| Up to 12 inches (30.5 cm) | Up to 50,000 FPM (254 m/s) |
Carbon-steel composites
Stainless steel alloy
Silicon carbide
Bronze
|
300 series stainless steel
400 series stainless steel
Alloy steel
Aluminum
Titanium
Brass
|
