SLS Case Study

SLS Case Study

An Aerospace Spin on Non-contacting Seal Technology

Non-Contacting Sealing Technology Reduces Wear, Heat, Increases Life Expectancy
Design features in the face of the mating ring force fluid (air, gas) into a converging gap in the sealing face. As the pressure builds, the faces separate.

Space Dragon Space Craft

Failure Is Not An Option On-Demand Webinar

Failure is Not an Option On-Demand Webinar, Static Metal Seals for Space Applications

Learn why static seals play such a vital role in critical applications, including the space industry.

Our Technetics engineers work directly with our customers to create the ideal sealing solution.

Webinar Highlights

Key Takeaways:

  • Why you need a metal seal
  • How metal seals work
  • What is a metal seal
  • Groove design considerations
  • Application Conditions
  • Leak rate discussion
  • Question & answer session

Learn about the basics of metal seals and their importance in this training presented by, Technetics Group Design Engineers, Michael Shealy, and Steven Henning, as well as Senior Project Engineer, Jason Adams.

Qualiseal® Circumferential Segmented Seals Solid

Radial Shaft Seal

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 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

  • 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
  • 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


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

  • Minimal leakage in an exceptionally wide temperature range
  • Tolerance to unlimited shaft axial movement
  • Very long life
  • Very low heat generation
  • 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


Have questions? A Technetics Group product specialist will get back to you to shortly.



Getting Technetical: What Will the Commercial Space Market Look Like in 2022?

The pandemic may have halted many industries from growing, but that is not the case for the commercial space market. Jason Riggs, Director of Strategy at Technetics, discussed the market’s future for 2022.

Space Satellite

Manufacturing in Space

Manufacturing in Space. It’s a thing and there are several companies now working to figure out the complexities and solve the challenges of manufacturing and assembling products in low-earth orbit and beyond.

How Metal Seals Work Infographic

How a Metal Seal Works

How a Metal Seal Works

The Awe and Engineering of Space Exploration

The Awe and Engineering of Space Exploration

Mars Perseverence Rover

The Mars Perseverance Rover’s Touch Down on the Red Planet

With the world watching via live stream, the Perseverance Rover landed on Mars on Feb. 18, 2021. Technetics provides many products for critical equipment in the space industry.