| 摘要 |
<p>1479888 Valves M STEAD and G HEAP 6 Sept 1974 [26 Sept 1973] 45085/73 Heading F2V A pivoted closure member 1 for a valve comprises a substantially disc-shaped portion 3 and two flow modifying portions 7 in the form of quarter-spheres. Openings are provided in the spherical portions in the form of holes or slots. Flow through the openings may be silenced by the provision of baffles or silencing material or by designing the openings to give tortuous paths.</p> |
