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)