Pipe-Lok Vales & Fittings Company delivers precision-engineered instrumentation fittings and valves trusted for reliability, safety, and performance in industrial applications with a strong focus on engineering excellence and quality control.
Engineered for sulfuric acid and aggressive chemical processing services. Alloy 20 pressure relief valves provide strong resistance to acid attack, chloride stress corrosion cracking and industrial chemical environments where standard stainless grades are limited.
High-Performance Flow & Safety Instrumentation Solutions
Alloy 20 is a nickel-iron-chromium alloy with copper and molybdenum additions developed for sulfuric acid resistance.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | 32.0 - 38.0 |
| Chromium (Cr) | 19.0 - 21.0 |
| Iron (Fe) | Balance |
| Copper (Cu) | 3.0 - 4.0 |
| Molybdenum (Mo) | 2.0 - 3.0 |
| Manganese (Mn) | 2.0 max |
| Carbon (C) | 0.07 max |
| Silicon (Si) | 1.0 max |
| Niobium + Tantalum | 8xC - 1.0 |
*Composition limits are indicative for the listed grade family; applicable product specifications may vary depending on valve component and product form.
Alloy 20 combines useful mechanical strength with strong resistance to acid and chloride-containing environments.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 551 MPa min |
| 0.2% Yield Strength | 241 MPa min |
| Elongation | 30% min |
| Hardness | Approx. 217 HB max |
| Density | Approx. 8.08 g/cm3 |
*Mechanical requirements depend on product form, heat treatment and applicable ASTM/ASME specification. Confirm final values against the material specification used for the pressure relief valve component.
High-performance material specifications for our complete Pressure Relief Valve range.
Designed for demanding pressure systems where material compatibility, corrosion resistance and reliable pressure protection are essential.
Commonly selected for sulfuric acid process and transfer systems.
Reliable for mixed acids, salts and corrosive chemical media.
Used in clean chemical handling and batch process systems.
Suitable for selected acidic and sanitary process environments.
Used in corrosion-resistant refinery and petrochemical skids.
Dependable pressure protection where stainless steel is not sufficient.
Pipe-Lok Vales & Fittings manufactures high-quality alternatives to the following standard industry part numbers
| Swagelok Part No. | Pipe-Lok Vales & Fittings Equivalent | Availability |
|---|---|---|
| SS-4R3A | Available | Ready to Ship |
| SS-4R3A1 | Available | Ready to Ship |
| SS-4R3A5 | Available | Ready to Ship |
| SS-4R3A5-BU | Available | Ready to Ship |
| SS-4R3A5-EP | Available | Ready to Ship |
| SS-4R3A5-KZ | Available | Ready to Ship |
| SS-4R3A5-NE | Available | Ready to Ship |
| SS-4R3A5-RT | Available | Ready to Ship |
| SS-4R3A-BU | Available | Ready to Ship |
| SS-4R3A-EP | Available | Ready to Ship |
| SS-4R3A-KZ | Available | Ready to Ship |
| SS-6R3A-MM | Available | Ready to Ship |
| SS-8R3A-MM | Available | Ready to Ship |
| SS-R4M8F8 | Available | Ready to Ship |
| SS-R4M8S8 | Available | Ready to Ship |
| SS-R4S8 | Available | Ready to Ship |
| SS-R4S12MM | Available | Ready to Ship |
| SS-RL3M4-F4 | Available | Ready to Ship |
| SS-RL3M4F4-RT | Available | Ready to Ship |
| SS-RL3M4-S4 | Available | Ready to Ship |
| SS-RL3S4 | Available | Ready to Ship |
| SS-RL3S4-SC11 | Available | Ready to Ship |
| SS-RL3S4-EP | Available | Ready to Ship |
| SS-RL3S4-MO | Available | Ready to Ship |
| SS-RL3S4-KZ-11002 | Available | Ready to Ship |
| SS-RL3S6MM | Available | Ready to Ship |
| SS-RL3S8MM | Available | Ready to Ship |
| SS-RL4M8F8 | Available | Ready to Ship |
| SS-RL4MR8 | Available | Ready to Ship |
| SS-RL4S8 | Available | Ready to Ship |
| SS-RL4S12MM | Available | Ready to Ship |