| 摘要 |
661,738. Check valves. TECHNICAL ASSETS, Inc. Oct. 6, 1949 [Oct. 12, 1948] No. 25692/49. Class 135. [Also in Groups XI and XIII]. An arrangement of check valves allowing movement of a pulsating fluid downwardly only in a conduit 24 and upwardly only in a conduit 25 comprises fixed lips 34 mounted on supports 35 extending across the pipes and hinged or flexible flaps 35 normally resting against the lips 34 and directed downwardly in the pipe 24 and upwardly in the pipe 25. |
