| 摘要 |
1,210,858. Valves. SAUNDERS VALVE CO. Ltd. 30 July, 1969 [7 Aug., 1968], No. 37708/68. Heading F2V. A plug cock type fluid flow valve comprises a plug 3, a member 8 having an aperture 11 therein to provide a flow passage through the valve, the aperture 11 being asymmetric with respect to the axis of the plug bore in the fully open position of the valve, and the member 8 being adapted to be selectively disposable in at least two different angular positions to provide different flow characteristics for the flow passage. The asymmetric orifice is triangular in shape and co-operates with the circular orifice of the plug 3. When the member 8 is secured to the end connection 2 then rotation of the connection 2 (after the removal of four securing bolts) through 90 degrees at a time gives a possible number of four different flow characteristics. The member may instead be provided with a series of peripheral apertures (14) (Figs. 4, 5, not shown) co-operating with a dowel (15) of the end connection (2). Alternatively the angular position may be made infinitely variable by providing the member (8) with a series of gear teeth (20) (Fig. 6, not shown) which co-operate with a worm 21. |
