Industrial Controller
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Infinite Innovation, the Future of Industrial Control Systems
Infinite Innovation, the Future of Industrial Control Systems
PRODUCT POSITION:HOMEPRODUCT—21B9340X012
21B9340X012
Key Specifications / Parameters Part Number: 21B9340X012 Product Type: Anti‑extrusion ring / backup ring Material: Carbon‑filled PEEK (or similar high‑performance polymer) for elevated temperature/pressure service Application: Prevents extrusion of sealing material (e.g., PTFE seal or soft seat) in the valve trim stack under high differential pressure/temperature service Typical Fitment: Included in parts tables for Fisher ET/EAT valves (e.g., NPS 2 size in some “above 232 °C / 450 °F” service) Service Conditions: Intended for elevated temperature and pressure service where standard backup rings would not suffice Role in Assembly: Positioned just beneath the seal ring (or adjacent to packing) so that when the seal attempts to extrude into a gap, the anti‑extrusion ring blocks that path and maintains seal integrity
DESCRIBE
The Fisher 21B9340X012 is an anti‑extrusion ring (also known as a backup ring) designed for use in high‑performance control valve trim assemblies (for example the Fisher ET / EAT sliding‑stem valves). Its purpose is to support a soft‑seat or packing seal by preventing extrusion of the softer sealing material into clearance gaps between the plug and cage under elevated pressure, temperature, or dynamic service conditions.
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