| 摘要 |
1,147,073. Valves. TEKNOVA A/S. 28 June, 1966 [1 July, 1965], No. 29008/66. Heading F2V. A change-over pressure regulator for bottled gas systems controls flow from two inlets 12a, 12b to a common outlet through similar valves 14. A spring-loaded diaphragm (3), Fig. 1 (not shown) which is responsive to pressure in the outlet chamber, acts through a lever (34), when this pressure falls, to move a plate 29 to the left. Journalled on a bent-over part 30 of the plate are two push rods 31a, 31b operative to lift the valves 14. A slot 28 in the plate slides on a pin 25 which is fast with a rotatable control knob carrying a pointer 22. Pin 25 is eccentric to the axis 17 of the knob and is biased by a hairpin spring 26 anchored at 27. In the position shown, inlet 12a is open and 12b is closed. This condition is indicated by the pointer on a scale portion 23a. On falling pressure, inlet 12a opens further and inlet 12b is also opened. This is indicated on a scale portion 23b. If the supply pressure at inlet 12a is restored the device returns to the first condition. If however this supply pressure is permanently exhausted, the knob is turned manually through about 180 degrees to bring the pointer against corresponding scale portions 23c, 23d, so that the regulation continues automatically with the valve of inlet 12b leading that at the other inlet in the opening direction. In a modification, Figs. 3 and 4 (not shown), the inlets are parallel and the diaphragm lever acts through a yoke (70). |
