When considering seal design for FDA seals specifically for food contact, there are 5 factors that must be considered: Operating Conditions This might sound obvious, but a seal designer may focus on different concerns than you with regard to the…
Autofrettage is a necessary step in the production process for pressure-retaining vessels in which enormously high pressure is used to plastically yield internal portions of the part to produce internal compressive residual stresses once the pressure is released. This process…
As long as they are the same style and material, an oil seal is an oil seal. At least that is what most people think. Putting aside potential differences in material and concentrating just on actual geometry, this statement is…
What is PV? PV is simply Pressure x Velocity and is generally expressed in psi x fpm. How is it calculated? Pressure (psi) x Surface Velocity {shaft Ø (inches*.262) x rpm} (fpm) What does AHPS PV Rating mean? The AHPS…
This may seem counterintuitive, but if you are sealing a rotating shaft under pressure, the answer may well be that you do! The functioning of traditional non-pressurized radial lip seals is based on the formation of a sealing and…
Automatic vee packing has been around since the 1920’s, when duck-and-rubber tubing was used to seal steam engines. Over the years, its use has expanded to seal plungers and rod and piston bores in a wide range of hydraulic applications…
As equipment requires higher and higher speeds and pressures, the race to one million PV is on. Critical to this is the ability for a seal to handle higher and higher PVs. Traditionally, contact seals have maxed out at…
Seal Materials for FDA Seals Designed for Food Processing The predominant approach to FDA seals for the food industry has been to simply take a seal design for industrial applications and use materials that are approved for food contact. Yet, seals in…
The common statement of “you get what you pay for” generally means low price = low quality or high price = high quality. In regard to seal design, this statement is not only misleading, but can also lead to the…
The SB40W seal has been designed to meet the ever-increasing demands for high pressure rotary seals. These seals are a double lipped spring energized seals with some very important features for critical applications. High pressure – The dual lip seal…
