Velan manufactures four types of maintenance valves for nuclear service. All four come in a size range of 1/4 - 2'' (8 - 50 mm) with a pressure rating of ASME Class 150 - 1500. The CLAMA and RAMA Light nuclear check valves have socket weld connections, the RAMA Bellows Seal globe valves offer butt weld connections, and RAMA nuclear globe valves have socket weld, butt weld connections.