| 摘要 |
<p>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 in a valve body (10) through 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 valve body port (50) on the same flow axis (22) as the upstream pipe. In both embodiments the flow turns in a component (12) installed, through the body access port (50). The above embodiments include floating and trunnion-mounted ball and partial ball valves, and butterfly valves. The preferred embodiment of a 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 valve member (11) from the valve body (10) through the access port (50).</p> |
