| 摘要 |
1,240,530. Valves. AUTOKEMI A.B. 4 Sept., 1968 [24 Nov., 1967], No. 42028/68. Heading F2V. [Also in Divisions G3 and F1] A pneumatically operated pulsator comprises an ejector nozzle which is supplied with air under pressure and is aligned, as shown, with an exhaust outlet 216, communication with the outlet being controlled by a valve member 213. The valve member is operated by a diaphragm 218 responsive to pressure in a control chamber 211 which communicates with the passage 215 in which the nozzle is mounted through a fixed or variable restrictor at 217 to set the response time. Build-up of pressure in the position shown will cause the valve to move downwardly to open position, whereupon the pressure in chamber 211 is depressed by the ejector and the valve returns to closed position. A snap action is achieved by a magnet 220 with abutments 221, 222 defining extreme positions of the valve. In the embodiment shown, the nozzle is in permanent communication with a conduit 214 which is alternately pressurized and opened to exhaust. This conduit may be connected through a manifold to a bank of diaphragm pumps, Fig. 2 (not shown) to operate the pumps. An extension 226 of the valve member may actuate or control external mechanical, electrical, pneumatic or hydraulic devices. |
