Pressure ratings for API 6A seals correspond to the valve's working pressure classification, ranging from 2,000 PSI through 20,000 PSI in standard increments. Common pressure classes include 2M, 3M, 5M, 10M, 15M, and 20M, where M designates thousand PSI working pressure. Each seal design must maintain its integrity throughout the rated pressure range while accommodating pressure fluct... https://globalsealstech.com/