API 6A defines pressure ratings using a four-digit designation system (e.g., 2M, 3M, 5M, 10M, 15M, 20M) where M represents 1,000 PSI. Gate valve seals must maintain integrity across these classifications under both working and test pressures. The standard requires seals to withstand 1.5 times working pressure during hydrostatic testing without leakage. Seal design parameters adjust ac... https://globalsealstech.com/