API 603 is a standard published by the American Petroleum Institute (API) that specifies the requirements for corrosion-resistant, bolted bonnet gate valves designed for use in severe service applications, particularly in the oil, gas, and petrochemical industries.
Key Features of API 603 Gate Valves:
1. Material Requirements
◦ Designed for corrosion-resistant applications, typically using materials like stainless steel (CF8, CF8M, CF3, CF3M) or other high-alloy metals.
◦ Suitable for harsh environments, including high-pressure, high temperature (HPHT), and corrosive media (e.g., sour gas, acids).
2. Bolted Bonnet Design
◦ Unlike pressure-seal bonnets, API 603 valves have a bolted bonnet, which allows for easier maintenance and inspection.
◦ The bonnet is secured with bolts, ensuring a tight seal under varying pressures.
3. Pressure & Temperature Ratings
◦ Complies with ASME B16.34 for pressure-temperature ratings.
◦ Typically rated for Class 150 to Class 1500, depending on size and material.
4. Fire-Safe Design (Optional)
◦ Some API 603 valves meet API 607/API 6FA fire-safe standards to prevent leakage in case of fire.
5. End Connections
◦ Flanged ends (ASME B16.5/B16.47) or butt-weld ends (ASME B16.25).
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