Extended bonnets position stem sealing components and actuator mounting interfaces far enough from the cryogenic valve body that ambient temperatures prevent freezing and maintain elastomeric seal flexibility despite cryogenic product flowing through the valve. Some designs incorporate active heating systems with electrical trace heating or steam jacketing to ensure external component... https://globalsealstech.com/product-category/oil-gas-seals/api-6d-ball-valve-and-lng-seals/