| 摘要 |
<p>1,042,997. Valves. PALL CORPORATION. Jan. 16, 1964 [Feb. 19, 1963], No. 1955/64. Heading F2V. [Also in Division B1] A spring washer 40 of frusto-conical form (dotted lines) normally closes an annular aperture against fluid flow, but at a predetermined pressure snaps open (full lines) to permit flow, and thereafter may remain open or may close when pressure falls, the " opening " being achieved by departure from the initial frustoconical form. The washer is made of spring steel, stainless steel, nickel-chromium alloy, polytetrafluoroethylene or polyoxymethylene.</p> |
