**DIN ISO 4126** is an international standard that defines the requirements for **safety valves** used to protect systems from excessive pressure. These valves are critical in ensuring the safe operation of pressure vessels, pipelines, and other industrial equipment.
- **General Requirements**: Covers safety valves for all types of fluids, including gases, steam, and liquids.
- **Set Pressure Range**: Applicable for valves with a set pressure of 0.1 bar gauge and above.
- **Flow Diameter**: Specifies a minimum flow diameter of 4 mm**.
- **No Temperature Limitations**: The standard does not impose restrictions on operating temperature.
- **Discharge Capacity**: Ensures that the valve can relieve excess pressure efficiently.
- **Backpressure Considerations**: Defines how backpressure affects valve performance.
- **Sizing & Selection**: Based on system requirements and fluid properties.
- **Coefficient of Discharge**: Determines the efficiency of pressure relief.
- **Leakage Testing**: Ensures tight sealing under normal conditions.
- **Material Specifications**: Typically stainless steel, carbon steel, or special alloys for durability.
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