ECT Vented Cappled T-Seals
- Vented Back-ups fo Positive Actuation
- Contamination Resistant
- Excellent Extrusion Resistance
- Low Friction
- Drift Resistant
- Long Wear - Long Life
- Positive Sealing to 5000 PSI
- Easy Orientation of Components
ESC's Capped T-Seal is a double-acting, high-pressure, high-performance piston seal accommodating larger extrusion gaps when used with ESC close tolerance wear-rings.
The Capped T-Seal assembly consists of a filled PTFE Cap and an elastomeric energizer. The two components are protected from extrusion and foreign material by two plastic vented anti-extrusion rings. While grit may become trapped between seal and dynamic surface in conventional systems, the Capped T-Seal's anti-extrusion rings serve as bore wipers, pre-cleaning the seal path and significantly reducing contamination caused wear or scoring. The "notches" or "vents" on the back-ups ensure immediate actuation of the energizer in high speed ocellating applications.
Each of the elements of ESC's Capped T-Seal is designed to perform a specific task. The T-shaped elastomeric energizer must transform axial pressure to radial loading and is compounded for low compression set and high modulus. The low friction sealing element (cap) is designed for sealability and optimal wear resistance, resulting in long operational life. Finally the anti-extrusion rings have been designed based on the use of wear-resistant Acetal or Nylon material to provide stability and superior extrusion protection.
This seal offers a high degree of sealability in both high and low pressure environments. The seal is designed to handle temperature extremes, a wide variety of fluid media and larger than normal clearances - yet it requires a short axial length gland, and assembles and installs easily in the shop or in the field. The Capped T-Seal is especially suited for long stroke applications due to its low sliding friction and unique geometry which prevents rolling or spiraling.
Unlike conventional cap-type seals, ESC's Capped T-Seal virtually eliminates piston drift. Piston drift is caused by low pressure leakage past the cap. Because conventional caps are not adequately energized at low pressures, leakage can occur, ultimately resulting in piston drift. ESC's cap is loaded both in the static mode through the proportional axial-to-radial conversion of system pressure levels. Thus, a full positive seal is maintained throughout the pressure range. The substantial, uniform cap permits a high degree of evenly distributed radial load, virtually eliminating the possibility of excessive wear and premature failure found in conventional cap type seals.
Wider clearances can be used when designing with the Capped T-Seal. This allows for the use of wear rings which eliminate the possibility of piston and bore damage due to metal-to-metal contact.
When designing with the Capped T-Seal, refer to the drawing and gland dimensions listed in Table 2.
View information on ECT Vented Capped T-Seals as PDF Brochure.