| 摘要 |
<p>1,271,268. Valves. ROBERTSHAW CONTROLS CO. 5 June, 1969 [6 June, 1968], No. 28499/69. Heading F2V. [Also in Division G3] A valve, which provides a relatively unrestricted flow in one direction and a comparatively restricted flow in the opposite direction, comprises a casing 10, two juxtaposed plate members 20 and 30 which are retained between casing shoulders 16 and 18, and a freefloating valve member 24, the two plate members being formed with aligned central apertures 22 and 32 respectively and the plate member 30 being additionally formed with a spiral throttling groove 34 which extends between aperture 32 and one of a number of peripheral recesses 36. In operation, fluid flowing from aperture 22 to an aperture 12 formed in the casing 10, tends to force valve member 24 against a plurality of projections 14 such that a relatively unrestricted flow takes place through apertures 22, 32, through channels formed between the valve member 24 and the projections 14, and finally through aperture 12. Upon the direction of flow being reversed, valve member 24 is caused to engage plate member 30 and a restricted flow takes place from aperture 12, through the one recess 36, through the spiral groove 34 and finally through the apertures 32 and 22. Figs. 6 and 7, not shown, indicate possible modifications of the throttling groove. Figs. 8 to 11, not shown depict a modification of the valve which includes, inter alia, an additional passage radially offset with respect a central passage corresponding to passage 22, the central passage having fluid flowing therethrough only in the unrestricted direction whilst being blocked by the valve member when such flow is reversed, with the fluid flowing through the valve, upon such flow reversal taking place, leaving the valve via the additional passage subsequent to passing through the restricted passage.</p> |
