| 摘要 |
<p>A method for connecting a ring line to a riser or standpipe, for liquid distribution systems, has a variable flow constriction inserted via an access port, to control the recirculating flow. The flow restriction is provided with a movable element (12) held in position by a spring and has tapering seal. The element is coaxial with a guide on a coaxial axis to the duct.</p> |
