| 摘要 |
<p>999,913. Valves. FILTRATION & WATER SOFTENING PROPRIETARY Ltd. Feb. 1, 1963 [Feb. 2, 1962], No. 4291/63. Heading F2V. [Also in Division B1] A multiway control valve has a cylindrical chamber formed between upper and lower body-sections 10, 12, Fig. 1; the latter embodies a cylindrical liner 16 with four equally spaced ports 17, Fig. 3, which open into body passages 18 which are curved so that the outer end of each passage is coaxial with the outer end of an opposite passage and parallel to the axis common to the outer ends of the remaining two passages. The upper body-section 10, which is provided with a large through-bore 20, Fig. 1, and a bearing ring 22, incorporates an inflow or outflow passage 23 that is not controlled by the valve and communicates laterally with the top end of the interior of the upper body-section 10. An elbow 24 is in register with the bore 20. A rotary closure-member 26 of elbow shape with a through passage 27 is journalled in the ring 22 and supported upon a pivot 26a so that upon rotation an inflow or discharge passage 24 is connectible to any one of passages 18, the other three of which latter are open to passage 23. The outer end of the member 26 is formed with rings 26b, Fig. 3, whereby each port 17 is closed before it registers with the passage 27. The member 26 is rotated through a spindle 28 via gearing or otherwise from a hand crank 31 or a motor, not shown. The valve may be used with a suction filter comprising four chambers 32-35, Fig. 4, the water from each of which is lead to a separate one of the four passages 18, Fig. 3; a suction pump 38 drains water from the passage 23, Fig. 2, and the pump delivery is connected to a service pipe 39 and another pipe 40 which is joined to the passage 24; a valve 42 connects the pump discharge to either one of the pipes 39, 40. In normal operation, the valve 42 directs the pump discharge to the service pipe 39. In order to back-wash any of the filters, the closure 26 is turned to that passage 18 which leads to the corresponding filter and the valve 42 is positioned to connect the pump discharged to pipe 39. A similar arrangement may be used with a gravity-filter system. As applied to a multi-chamber pressure filter, Fig. 5, not shown, the multiway valve is arranged centrally above the filter chamber whilst the water to be filtered is led to passage 23 and the passage 24 leads to a wash-water discharge-pipe 45. A valve is provided in the common filtrate-discharge pipe.</p> |
