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.
Built for seawater, hydrofluoric acid and alkaline service where nickel-copper alloy performance is preferred. Monel pressure relief valves offer excellent toughness, marine corrosion resistance and dependable operation in demanding non-oxidizing environments.
High-Performance Flow & Safety Instrumentation Solutions
Monel 400 is a nickel-copper alloy with excellent resistance to seawater, steam at high temperature, salts and caustic solutions.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 28.0 - 34.0 |
| Iron (Fe) | 2.50 max |
| Manganese (Mn) | 2.00 max |
| Carbon (C) | 0.30 max |
| Silicon (Si) | 0.50 max |
| Sulfur (S) | 0.024 max |
*Composition limits are indicative for the listed grade family; applicable product specifications may vary depending on valve component and product form.
Monel 400 provides good strength and toughness over a broad temperature range with strong resistance to marine corrosion.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 480 MPa min |
| 0.2% Yield Strength | 170 MPa min |
| Elongation | 35% min |
| Hardness | Approx. 65 HRB min |
| Density | Approx. 8.8 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.
Monel K500 is an age hardenable nickel-copper alloy in which aluminium and titanium additions allow precipitation strengthening, while retaining the corrosion resistance of Monel 400.
| Element | Weight Percentage (%) |
|---|---|
| Nickel (Ni) | 63.0 min |
| Copper (Cu) | 27.0 - 33.0 |
| Aluminium (Al) | 2.30 - 3.15 |
| Titanium (Ti) | 0.35 - 0.85 |
| Iron (Fe) | 2.00 max |
| Manganese (Mn) | 1.50 max |
| Silicon (Si) | 0.50 max |
| Carbon (C) | 0.25 max |
| Sulfur (S) | 0.010 max |
*Composition limits are as per the applicable ASTM/ASME specification for UNS N05500; actual limits may vary depending on valve component and product form.
In the age hardened condition Monel K500 provides roughly three times the yield strength of Monel 400, along with low magnetic permeability and resistance to galling, making it ideal for stems, springs and fasteners.
| Property | Typical / Minimum Value |
|---|---|
| Tensile Strength | 965 MPa min |
| 0.2% Yield Strength | 690 MPa min |
| Elongation | 20% min |
| Hardness | 27 HRC min |
| Density | Approx. 8.44 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.
Suitable for seawater cooling, shipboard lines and offshore instrumentation systems.
Used in non-oxidizing acids, alkalis and salt solutions.
Reliable for sour-adjacent and chloride-bearing service after media review.
Often selected for hydrofluoric acid service under controlled conditions.
Used in feedwater heaters and auxiliary corrosion-resistant systems.
Suitable for brine and seawater pressure control applications.
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 |