Two core mechanisms:
Plastic deformation (coining) – Bolt preload compresses the gasket, causing controlled local plastic deformation (not full permanent deformation) to fill microscopic groove irregularities. Full permanent deformation is incorrect, as RTJ gaskets retain partial elasticity to maintain sealing contact, while local plastic deformation ensures a tight fit with the groove.
Wedging effect – The tapered side walls of the RTJ flange groove force the gasket inward during bolt tightening, converting axial bolt load into radial sealing pressure. This clarification specifies the groove’s tapered structure (a key detail of RTJ flanges) that enables the wedging action, which was not explicitly stated in the original.
Hardness rule – Gasket must be at least 30 HB (Brinell Hardness) softer than the flange groove, so the gasket deforms first and protects the expensive flange. Adding “Brinell Hardness” (HB) clarifies the hardness standard, avoiding ambiguity for readers unfamiliar with industry abbreviations.
Self‑energising (RX/BX) – Internal pressure pushes the gasket harder against the groove walls – the higher the internal pressure, the tighter the seal. This corrects the vague “groove” to “groove walls” (the specific contact surface) and emphasizes the direct correlation between pressure and seal tightness, aligning with RX/BX’s self-energizing design principle. Note: Self-energizing is exclusive to RX/BX types (not R-type), which is implied here and consistent with industry facts.
Single use only – Never reuse an RTJ gasket. The reason (critical for industry compliance) is补充: After installation, RTJ gaskets undergo irreversible local plastic deformation; reusing them will lead to poor sealing, leaks, and potential safety hazards, which is a key industry requirement to highlight for readers (e.g., engineers, purchasers).
There are many types of RTJ gaskets, including R Gasket,RX Gasket,BX Gasket, SBX Gasket,IX Gasket,flange connections,and various customized products.We will do more sharing about ring joint gasket.
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