ANGLE ENTRY ROTARY VALVE

摘要

Straight line flow rotary valves with the valve member flow passage (21) turned away from the pipeline flow axis (22), to dispose the valve internals to an access port (50) located downstream on the same flow axis of the valve member (11 ). Another embodiment is used in place of pipe elbows where the rotary valve internals are accessed through a port (50) on the same flow axis (22) as the upstream pipe. In both valve body embodiments, the flow is turned again, downstream of the valve member (11), to communicate with the connecting downstream piping which, in the first embodiment is along the same axis as the upstream pipe (22), and in the second embodiment, is on a different axis (39), and, is generally 45 or 90 degrees turned from the upstream pipe. In both embodiments the flow turns in a component (12) installed, through the body access port (50). In all embodiments the turning component also services as the pressure boundary access cover over the body opening (50). In a variety of embodiments the turning component (12) additionally services as the valve seat (13), and as a behind the seat seal (16). Sealing member embodiments include floating and trunnion-mounted ball and partial ball valves, and butterfly valves. The preferred embodiment of butterfly valve has a removable resilient seal material (71) such as PTFE or a graphite-based laminate, retained to the valve disc member (11) to facilitate complete repair of all flow isolation surfaces without having to remove the disc member from the valve through the access port (50). Method for removing and installing valve internals through the access port is disclosed.