G-T® Ring 32 Series
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SEALING DESIGN SOLUTIONS The unique G-T® Ring provides a compact double-acting seal for use in heavy-duty applications that previously required a more bulky type of seal, as well as for retrofit in standard grooves designed This proven seal combines a tough, resilient, T-shaped sealing ring with precisely-dimensioned pressure actuated nonextrusion rings for use with pressures ranging from zero to 20,000 psi and higher. for O-rings with one, two or no backups. This causes radial swelling or expansion of the flange under the (see Figure 2). with no piston drift and minimum piston length. This seal eliminates nonextrusion back-up ring on the low-pressure side of the assembly Performance, reliability and economy as a piston seal are unequaled two major sealing problems: The skive cut in the nonextrusion ring permits instantaneous radi1. The G-T Ring sealing element is protected from extrusion so al movement into positive contact with the cylinder bore or rod that it seals satisfactorily when clearances must be abnormally being sealed, closing the clearance gap before any extrusion of large or where pressures are high. the sealing element occurs. spiral failure. Since the nonextrusion ring does not rely on axial compression to radially expand but is moved radially by hydro-mechanical action, it does not need to be made of easily deformed material. Rather, 2. The unique G-T Ring configuration prevents seal roll and it can be made of durable, low friction material with high shear strength and high resistance to cold flow, resulting in superior resistance to extrusion. These pressure-activated nonextrusion rings successfully protect the seal both from extrusion and contamination. As radial loading of nonextrusion rings varies directly Figure 1 with fluid pressure, seal friction is kept to a minimum during the logging tools, drilling tools, completion equipment, wellhead equipment, valves, accumulators, injection pumps, actuators, test The seal is installed in the groove on a flat, stable, static base. equipment and other demanding oilfield applications. Two nonextrusion rings complete the rectangular shape of the seal assembly and “lock” the T-shaped sealing element in position Extrusion Resistance so that it is restrained from rolling around the circumferential axis. The G-T design resists extrusion by preventing the elastomeric sealing element from wedging into the diametral clearance or The G-T Ring cannot roll, twist and spiral (see figure 3) and, pinching off under motion or pressure. therefore, it is not subject to this mode of failure. Under pressure, the resilient T-shaped elastomeric sealing element deforms, transmitting hydraulic pressure “down stream.” © 2008, Greene, Tweed all rights reserved All trademarks are property of their respective owners. 06/08-GT DS-US-OF-031 low pressure portion of the pressure cycle. The G-T Ring is a piston, rod or static seal for use in service tools,

standing capability of the G-T Ring to bridge the extrusion gap permits its use with high clearances due to design restrictions, cylinder expansion or where there is side loading (see Figure 4). Since the G-T® nonextrusion ring prevents extrusion and spiraling of the elastomeric sealing element, it is not necessary to sacrifice G-T Ring design features that prevent roll of the seal (see Figure 3) selecting a harder compound for its resistance to extrusion, even desirable wear resistance or low compression set characteristics by at high pressures. Wear-resistant compounds with low...

HOW TO SELECT THE PROPER SEAL Style # 32 The G-T® Ring 32 Series is especially recommended for high-pressure hydraulic systems, in systems that develop high-pressure spikes, or systems where rapid accelerated motion or rapid pressure reversals occur. The style #32 radiused G-T Ring is an advanced concept to meet the rigorous sealing requirements of the oilfield industry. Since their introduction, the seals have demonstrated their superi- ority in thousands of oilfield, industrial and aerospace applications. Seal Width Three seal widths are available—wide, intermediate and narrow. In rugged...