The unique G-T® Ring provides a compact double-acting seal for use in new design for heavy duty applications where a more bulky type of seal had previously been required, as well as for retrofit in stadard grooves designed for O-rings with two, one, or no backups.
This proven seal combines a tough, resilient, T-shaped sealing ring with precisely-dimensioned pressure actuated non-extrusion rings—for use with pressures ranging from zero to 10,000 psi and higher.
Performance, reliability, and economy as a piston seal are unequaled—with no piston drift, with minimum piston length. This seal eliminates two major sealing problems: 1) The G-T Ring sealing element is protected from extrusion so that it seals satisfactorily when clearances must be abnormally larger or where pressures are high; 2) The unique G-T Ring configuration prevents
seal roll and spiral failure (See Fig. 1).
The G-T Ring is a piston, rod or static seal for use in cylinders, intensifiers, accumulators, spool valves, and other demanding fluid power applications. It is currently specified for critical applications on all major jet aircraft (both military and commercial), sealing accumulators, reservoirs, actuators, valves, and the most rugged landing gear shock strut applications. The 11,000 Series
seals are designed to fit industrial O-ring glands incorporating nominal rod and bore diameters for zero, one and two backup widths per MIL-P-5514B.
The G-T design resists extrusion by preventing the elastomeric sealing element from wedging into the diametral clearance, or pinching off under motion or pressure. Under pressure, the resilient T-shaped elastomeric sealing element deforms, transmitting hydraulic pressure “down stream.” This causes radial swelling or expansion of the flange under the non-extrusion back-up ring
on the low pressure side of the assembly (See Fig. 2). The skive cut in the non-extrusion ring permits instantaneous radial movement into positive contact with the cylinder bore or rod being sealed, closing the clearance gap before any extrusion of the sealing element can occur.
Rather, they can be made of durable, low friction material with high shear strength and high resistance to cold flow which results in superior resistance to extrusion. These pressure-activated nonextrusion rings successfully bridge the large clearance incident to the use of wear-rings and protect the seal both from extrusion and contamination. As radial loading of the non-extrusion rings varies directly with fluid pressure, seal friction is kept to a minimum during the low pressure portion of the pressure cycle.