Mechanical Seals Archives - Technetics Group

Design Process That Goes Above and Beyond

Design Process That Goes Above and Beyond

Qualiseal wins over customers with custom design, verification, and field testing. In-house lab testing shortens the validation process by a factor of years. A rigorous design and review process provides customers with peace of mind. The team maintains the relationship with superior customer service.

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Qualiseal® Circumferential Segmented Seals Solid

Radial Shaft Seal

December 20, 2021/in Circumferential Seals, Mechanical Seals Commercial Aircraft, Industrial, Military, Space /by PepperAdmin

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.

Segmented Seals Controlled Gap/Bushing

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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

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.