1. Spring Energized U-Cup Description
2. Spring Energized U-Cup Design
1. Dynamic Lip Configuration
2. Static Lip Configuration
3. Jacket Material
4. Spring Design
5. Spring Material
Spring energized U-cups are engineered plastic seals, which incorporates a metallic spring into its design. The spring loads the seal lips against the mating hardware. This creates a seal capable of compensating for movement in dynamic applications. The spring provides the necessary lip squeeze to compensate for movement in dynamic applications.
|Spring Energized U-Cup Design|
Hi-Tech Seals recommends that clients contact one of our representatives when designing a new application.
Download a Seal Application Data Sheet to assist with communicating application needs
2. Determine if the same sealing lip is appropriate for the static lip. Spring energized U-cups do not need to be symmetrical.
|3. Identify which jacket material is required.
Variables to consider include temperature, chemical, pressure, velocity, and cost.
Go to our Chemical Compatibility Guide.
4. Select a Spring Design
Our in-house manufacturing typically uses cantilever springs. Helical and slanted coil springs are available upon request. Additionally, Hi-Tech Seals provides welded springs upon request.
Cantilever Spring (Finger Spring)
A cantilever spring is recommended for dynamic, medium load applications where low friction is desired. The V-shape spring provides constant compression load and is further energized by system pressure.
A helical wound spring is made from a metal ribbon, which is coiled into a helix. The spring compresses radially producing a very high load versus deflection. The helical wound spring is preferred for static applications or applications where sealability is more of a concern than friction.
Slanted Coil Spring
A slanted coil spring, also known as a canted coil spring, is manufactured from a round wire that is coiled and angled. The process creates a compression force in the radial direction. The canted coil design is suited for dynamic applications where low friction is critical.
Go to our U-cup spring dimension charts.
5. Select a Spring Material
Most springs are composed of stainless steel; however, Hastelloy®, Inconel, and Elgiloy® are used in applications that require additional corrosion resistance.