The Greene, Tweed Ener-Cap® II is a self-actuating, pressure-activated hydraulic seal that optimizes cap seal performance within standard Aerospace seal glands. The Ener-Cap II HP includes one or two anti-extrusion rings to give higher pressure capabilities by preventing extrusion of the PTFE sealing element. The cap seal design results in low breakout and running friction and minimal leakage over an extended service life, making this seal design ideal for dynamic service.
The PTFE-type sealing element and advanced-design elastomeric energizer provide optimum radial squeeze and evenly distributed radial loading. This design gives a high degree of seal stability and extended service life. Our Avalon® materials offer exceptional performance. A custom-molded energizer ensures correct squeeze levels are maintained. The addition of circumferential cap grooves will improve the lubrication and reduce outboard leakage.
Operating temperatures can range from -80°F to 450°F (-62°C to 232°C) with pressures to 4,000 psi (276 bar), dependent upon the selected materials and hardware clearances. The Ener-Cap II HP extends the working pressures significantly and operates successfully at above 8,000 psi (550 bar).
The Ener-Cap II is available for rod or piston applications in
standard zero back-up, one back-up or two back-up width glands
Notches—Blow By Protection
Both piston and rod type 52 series Ener-Caps can be supplied with notches for blow by protection, in accordance with SAE AIR 1243.
Circumferential grooves can be added to the 52 series piston and rod Ener-Caps to provide for better dynamic sealing (except for the smaller -0XX sizes). The grooves will retain lubricant that enhances start-up performance by releasing the lubricant to the sliding surfaces as the surface moves.
Greene, Tweed has designed the 5279 series of Ener-Cap II HP to combine the long-life, low-friction properties of the Ener-Cap II with the high shear strength back-up capabilities of a back-up ring. This allows the seal to be used at pressures in excess of 4000 psi (276 bar). The Ener-Cap II HP is available for rod and piston applications in standard one back-up and two back-up glands only.
Contact GT engineering for specific part numbers.
The part numbering system requires the use of the material designator tables found in the next column. For nonstandard designs contact GT engineering.
Contact your local Greene, Tweed representative for specific recommendations to suit higher performance requirements.
Ener-Cap 59 Series
The original Ener-Cap design, 59 series, has been replaced by 52 series Ener-Cap II for all new applications.