Compact connections have immense power. We're going to discuss Grayloc Clamp Connectors and RTJ Flange structures in detail. Let's start with Grayloc Clamp Connectors. 1️⃣ Structure Principle: The Grayloc connection system consists of three parts: two hubs (weld ends or flange ends), a metal seal ring, and a split clamp. The core sealing mechanism relies on a self-tightening metal lip seal structure. As internal pressure increases, the sealing force also automatically increases. The clamp provides axial pretension, but it does not bear the entire sealing function. This is a pressure-assisted metal sealing structure. 2️⃣ Key Engineering Characteristics: 3️⃣ Typical Application Scenarios: PA66 high-compression polymer melt system (the melt gear pump outlet you mentioned earlier), residue hydrocracking slurry bed reactor high-pressure lines over 45MPa, high-pressure hydrogen systems, and compactly arranged areas on marine platforms for high-temperature and high-pressure gas transmission. In high-pressure, frequently inspected, and space-constrained scenarios, Grayloc offers significant advantages. Next up is RTJ Flange. RTJ Flanges conform to ASME B16.5 / B16.47 standards for high-pressure flanges. 1️⃣ Structure Principle: Flange end faces are machined with annular grooves, into which metal gasket rings (octagonal or elliptical) are inserted. Bolt groups provide the compressive force, and the seal depends on bolt pretension. This is a bolt pretension type sealing structure. 2️⃣ Key Engineering Characteristics: 3️⃣ Core Structural Differences Analysis: 🔬 1️⃣ Different Force Paths: RTJ Flanges: Internal pressure → Flange separation tendency ↑ → Relying on bolts to maintain sealing force Grayloc: Internal pressure → Seal ring automatically enhances sealing → Clamp stress remains stable. 👉 Grayloc is a structure that becomes "more sealed as pressure increases." 📐 2️⃣ Volume and Weight Comparison: For Class 1500 or higher ratings: RTJ Flanges are larger and heavier Grayloc compactness can reduce installation space by 40%–60%. 3️⃣ Maintenance Efficiency Comparison: In polymer systems requiring regular inspection or high-pressure pump outlets, Grayloc shows significant advantages. Material and Adaptability Comparison: Grayloc common materials include A105, F6NM, SS347, Inconel 625, Monel 400, and Duplex 1.4462. Seal ring options include soft iron, Inconel silver plating. RTJ common materials include A105, A350 LF2F316F51 with octagonal metal gaskets (R-type / RX-type / BX-type). Selection Recommendations for Your High-Pressure Chemical Scene: Based on your focus: 45MPa hydrogen HF/KF corrosive environments High-temperature melt systems Extruder and booster pump interfaces ✔ More suitable for Grayloc situations: High-pressure circulating systems Frequent maintenance Space constraints Sensitivity to weight Vibrating environments ✔ More suitable for RTJ situations: Standardization requirements Large-diameter static pipelines Cost-sensitive projects Low-frequency inspection areas. Engineering Economics Comparison: In high-end installations (PA66, hydrogenation, marine engineering), Grayloc is more focused on "long-term value." Summary: The engineering philosophies of both systems. RTJ is a standardized, traditional, general-purpose high-pressure solution. Grayloc is an advanced, high-pressure compact and maintenance-friendly solution. If your project involves: High pressure >25MPa Frequent disassembly Compact layout High-value equipment Then the structural advantages of Grayloc will be more evident. If you need, I can generate a cross-sectional engineering diagram of Grayloc vs RTJ structures (suitable for PPT), create a PA66 process pump connection selection decision table, output an A4 printed technical white paper or make a specific selection recommendation for your current project (such as polymerization stage or hydrogenation stage). Are you more interested in engineering decision-making documents or market promotional technical articles?