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.
Today 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.
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.
In the past, we’ve used this blog to discuss the hidden cost of gasket failure. While gaskets represent a fraction of the cost of the machines or systems in which they are installed, the consequences of a failure can range from nuisance leaks to catastrophic failure.
And with that failure comes damage to equipment, lost production time, non-compliance penalties, along with loss of customer confidence and even the threat of litigation.
In that article we said that 68% of gasket failures were due to insufficient load, stemming from improper installation, misapplication, poor flange design and/or bolt selection, and rotated flanges. Today, we’ll look at the first section of that list.
Freudenberg has the expert engineering and materials expertise to provide the high performance diaphragms your equipment demands, in standard or custom-designed sizes and formats for any application. Its teams have been directly involved in the development and growth of the diaphragm industry, and they bring that expertise to every customer collaboration.
Thordon Bearings designs and manufactures a complete range of high performance, non-metallic journal bearing solutions for marine, pump, hydro-turbine, offshore oil and other industrial markets.
From water lubricated stern tube and rudder bearings for ships to grease free wicket gate bearings for clean power generation, Thordon provides innovative non-polluting bearing solutions that meet or exceed the technical requirements of your application.
Since the first Thordon bearing was developed in 1966, Thordon has continuously improved its high performance polymer technologies and bearing designs to become the world leader in elastomeric bearing technology. Our applications engineering and global technical support teams can support your most unique bearing technical challenges.
As we continue this blog’s PTFE series, we’re going to take a closer look at PTFE rotary seal shaft considerations.
In rotating applications, proper surface finish is crucial for getting positive sealing and the longest seal life possible. Rotating surfaces that are too rough could create leak paths and can also be very abrasive. Unlike elastomer contact seals, PTFE lips can run on very smooth surfaces regardless of lubrication.
Gallagher Fluid Seals stocks a wide variety of GORE® Gasketing Products. Realizing that every application is different, use the infographic below to determine which GORE gasketing material product best fits your application.
If you’re uncertain which GORE product to use, please contact the Gallagher Engineering Department.
Their outstanding performance in critical media makes Freudenberg’s new EPDM materials the first choice for a broad range of O-ring, molded part and diaphragm applications in the food and beverage and pharmaceutical industries, compliant with all essential national and international standards.
Knowing what counts: as the market specialist for demanding sealing applications in process industries, Freudenberg Process Seals has expanded its range of EPDM materials and optimized it for use in the most critical application scenarios, allowing us to offer you uncompromising functionality for smoothly running production processes in an even broader spectrum of applications.
Gallagher is regularly a top 10 Parker distributor, stocking standard parts in its King of Prussia, PA and East Longmeadow, MA branches. The Gallagher engineering department also works with Parker engineers to create custom sealing solutions for our customers.
Parker provides a wide range of specialty elastomers to accommodate the various critical sealing challenges presented by the life sciences industry. Selecting a suitable material is critical to patient health. For this reason, the FDA provides a standard (21 CFR177.2600) defining allowable rubber compound ingredients and extractibles based on toxicity and carcinogenicity.
With the purchase of Johnson Packings in 2014, Gallagher Fluid Seals gained a 40,000 square foot manufacturing facility in East Longmeadow, MA.
The Gallagher manufacturing facility, with its 22 employees, is capable of fabricating many sealing products you’re probably already using in your production.