PTFE Back-up Rings or O Rings Used for Valve

• Material: PCTFE
• Application: Equipment Seal, Pump Seal, Flange Seal
• Shape: O-Ring
• Style: Mechanical Seal
• Function: Hole Sealing, Fixed Sealing
• Transport Package: Export Carton, Pallet
• Model NO.: pctfe
• Specification: Standard, Nonstandard, full specification
• Trademark: hdgfz
• Origin: China
• HS Code: 3902900090
• Production Capacity: Big&Stable

Product Description

                                                                   PTFE Back-up rings

         Back-up Rings are flat, split,spiral or contoured washer type fittings used to protect an O-Ring seal from extrusion at higher pressures and temperatures. A Back-up Ring works by blocking or reducing the extrusion gap, thus preventing the o-ring from extruding.

           PTFE Back-up rings are the most common anti-extrusion devices employed in dynamic and static sealing, designed to prevent the migration of sealing material into the extrusion gap under the system pressure. Hongda offers a wide range of back-up ring geometries and materials to suit every seal type and application. They are open or closed shapes for snap assembly made of a broad range of compounds which are highly resistant to thermal or mechanical stress.The back-up rings help reduce costly downtime and ensure long-term functional reliability.

        The use of a back-up ring increases the pressure and temperature capability of o-rings. Back-up Rings can be solid, split, spiral or contoured. The split and spiral back-up rings are easier to install, especially in small diameters. The chart to the right depicts the higher pressure capabilities of using Back-up Rings for a given clearance gap dimension.



Back-up Rings can be used on both sides of the O-Ring if pressure is bidirectional. Gland widths should be widened to accommodate one or two Back-up Rings.

Hot Material: Virgin PTFE, Carbon filled PTFE, Graphite PTFE and customized materials

Please contact us for selection and design assistance.