In the world of sealing technology, choosing the right seal is critical for ensuring system reliability, safety, and performance. Among the many seal designs used in oilfield and industrial equipment, the T-Seal stands out for its excellent balance between compact design, high-pressure capability, and easy installation.

What is a T-Seal?

A T-Seal is a three-piece sealing assembly that consists of one elastomeric sealing element in the shape of the letter “T” and two backup rings (usually made of PTFE, PEEK, or other anti-extrusion materials).

This design helps the T-Seal maintain a strong sealing force under both low and high pressures, while also preventing extrusion — a common failure mode for traditional O-rings in high-pressure applications.

Key Features and Advantages

Excellent Anti-Extrusion Performance
The two backup rings on either side of the elastomer core provide robust support, preventing the rubber from being forced into the extrusion gaps under high pressure.

Stable Sealing Across Pressure Ranges
Unlike O-rings, which can roll or twist during installation or operation, the T-Seal’s geometry keeps it stable and properly oriented, ensuring consistent sealing from low to high pressure.

Compact Groove Design
T-Seals are often used as a direct replacement for O-rings in rectangular grooves, requiring minimal modification to the existing hardware design.

Ease of Installation
The split backup rings (when designed that way) allow for easier installation compared to solid backup configurations, especially for larger diameters.

Typical Applications

T-Seals are widely used in:

Hydraulic cylinders

Wellhead and downhole tools

Subsea equipment

Valves and actuators

High-pressure testing systems

Their ability to perform reliably under extreme pressures and dynamic conditions makes them a popular choice in the oil & gas, aerospace, and industrial hydraulic sectors.

Contact JST seals for a reliable sealing solutions.