| 摘要 |
<p>1284169 Valves H R GERDTS and W F GERDTS [trading as GUSTAV F GERDTS KG] 4 Sept 1970 [4 Sept 1969] 42565/70 Heading F2V A non-return valve comprises a metallic tubular body 1, an annular plastics member 4, 6 at each end of the body 1 held thereto by collars 2, 3, and a valve disc 9 made of plastics material urged towards a seat 5 by a spring 14. The valve disc 9 carries stroke-limiting projections and guide ribs 11. The annular members 4, 6 may alternatively be adhered to the body 1.</p> |
