Avoiding Spiral Twist with the Quad-Ring Brand Seal

Quad-Ring Brand SealFounded in 1945, Minnesota Rubber and Plastics is a pioneer in the design and production of four-lobed seals with the Quad-Ring® Brand seal design.

Today these seals are used around the world for a wide variety of static and dynamic sealing applications.

Avoiding Spiral Twist

To minimize breakaway friction, an O-Ring groove must be wide enough to allow rolling or twisting of the seal. In the long stroke of a reciprocating seal application, this twisting action can strain and eventually tear the rubber, causing a failure mode known as spiral twist.

To prevent spiral twist, the Quad-Ring Brand seal four-lobed configuration is designed to withstand the distortion and extrusion often caused by high or pulsating pressure. To accommodate these forces, a Quad-Ring Brand seal uses a narrower groove than a comparable O-Ring seal.

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Introducing the Gallagher EAR Form

Gallagher EAR formGallagher Fluid Seals is pleased to announce the launch of its new engineering application request (EAR) form, designed to help our clients get answers to their sealing problems.

In a way, it seems fitting that we’re using the acronym “EAR” for this form, because it allows us to listen to our client’s needs.

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KLINGER Expert, Gasket Selection Assistance from Thermoseal

KLINGER expert

KLINGER®expert’s aim is to provide solutions to your gasketing problems, using years of experience, technical information and laboratory test results.

The innovative software takes your specifications and suggests the right KLINGERSIL® compressed gaskets grades, along with homogeneous graphite metal laminates and KLINGERtop-chem® PTFE sealing element. KLINGER expert shows you all of the variable parameters and allows you to change them on the screen. You choose the relative importance of function, cost, and handleability.

You can choose between standard ANSI and DIN flanges or enter details of your own specific flange. KLINGER expert will automatically calculate maximum and minimum sealing stress and fastener torque in all popular grades.

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What Causes O-Ring Cracking?

o-ring crackingHere at Gallagher Fluid Seals, we provide O-rings to almost every industry you can think of: fluid power, chemical processing, aerospace, energy oil & gas, life sciences, pulp & paper, etc.

The thing with an O-ring is as long as it’s doing its job, you never really even know it’s there. It is only when an O-ring starts to fail and a leak develops that you investigate the problem.

One of the key causes of O-ring cracking is ozonolysis (ozone cracking). Ozone cracking occurs mostly with Nitrile Rubber o-rings (nitrile, buna, buna-N).

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Designing a Sealing Solution

sealing solution At Gallagher Fluid Seals, engineering is central to every project and solution we deliver.  Our goal is to provide sealing solutions where there had been sealing failures, and our engineering team is among the most experienced and talented in the industry.

As an independent distributor, we have the freedom to be objective and create the optimal sealing configuration for your application.  Our engineers work with the design teams of both our customers and suppliers, to ensure all sides of the application are thoroughly considered and there are no surprises at the end of the project.

This blog post is the first in a four-part series discussing how we work with our customers to create a sealing solution for their most critical applications.  The first step in this process is application discovery and review.

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Webinar: A New Generation of Freudenberg Polyurethane

Freudenberg Polyurethane“This is an exciting time for us, because we do have a new generation of polyurethane.”

That’s Greg Daniels of Freudenberg Sealing Technologies, speaking in the recent webinar we ran with our friends at the German company.

He’s talking about the benefits of 94 AU 30000, a durable, effective new sealing solution. Here are the basics of some of the characteristics of this new Freudenberg polyurethane:

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VIDEO: Flexibility in Your Rigid Piping Systems With Abra-Line

Abra-LineGarlock ABRA-LINE ™ rubber expansion joints offer superior performance, reliability and service life in your plant.  Expansion joints are specially engineered products inserted in a rigid piping system to achieve one or more of the following:

  • Absorb movement
  • Improve thermal stability
  • Relieve system strain due to thermal change, load stress, pumping surges, wear or settling
  • Reduce mechanical noise
  • Compensate for misalignment
  • Eliminate electrolysis between dissimilar metals

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PTFE Radial Lip Seal Applications

dieselToday we’ll conclude our series of blog posts on PTFE by discussing some PTFE radial lip seal applications, as well as a brief look at wear sleeves.

PTFE has superior mechanical and physical properties and chemical resistance, which means the areas where PTFE radial lip seals are used is growing. These areas include:

Diesel Engine Applications

These consist of the front and rear crankshaft, accessory drive, and blower and thermostat seals. PTFE seals are used and tested in these areas because they can meet the performance and life requirements of modern engines.

Minimum wear, performance at high temperatures with limited lubrication, resistance to abrasive contaminants and fluid compatibility are the main factors for PTFE’s use in these applications.

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Gallagher Seals Lunch & Learn

Gallagher Seals lunch & learnIn the past few years, Gallagher Fluid Seals has greatly expanded the ‘Lunch and Learn’ events that we hold for our customers and prospects.

These events are typically aimed at organizations that have engineering departments or maintenance staffs whose jobs require them to interact with seals on a consistent basis.

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PTFE Rotary Seals: Housing, Pressure and Shaft Run-Out

rotary7Today we’ll continue our look at PTFE rotary seals by focusing on three areas: housing/bore considerations, pressure and shaft velocity and shaft misalignment and runout.

Housing/Bore Considerations

Typical PTFE rotary lip seals are pressed into the bore to assure proper OD sealing and seal retention in the housing. Most seal and housings are made from steel and cast iron. Take care when softer materials – aluminum, bronze, plastic – are used for the housing. Aluminum has a thermal expansion rate almost double that of steel. Metal case designs can lose the required press fit in an aluminum housing when they go through thermal cycles due to the higher rate of thermal expansion of aluminum.

A finish range of 32 to 63 μin Ra (0.8 to 1.6 μin Ra) is recommended for service pressures up to 3 psi (0.20 bar). For thicker fluids such as grease, a 125 μin Ra (3.17 μin Ra) finish would be acceptable with no system pressure.

A lead in chamfer is strongly recommended for all seal housings. The chamfer aligns the seal during installation and helps keep the seal from cocking. Both corners of the chamfer should be free of burrs or sharp edges. For pressurized rotary applications, take additional precautions to ensure the seal isn’t pushed from the housing.

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