Pressure ratings for API 6A gate valve seals are classified by working pressure levels designated as 2M, 3M, 5M, 10M, 15M, and 20M, where M represents thousands of psi. Each rating corresponds to specific design parameters and testing protocols. Higher pressure ratings require more robust seal geometries and advanced materials capable of withstanding greater compressive forces without... https://globalsealstech.com/product-category/oil-gas-seals/api-6a-gate-valve-seals/