| 摘要 |
<p>912,077. Valves. CLAYTON DEWANDRE CO. Ltd. Aug. 19, 1960 [Aug. 28, 1959], No. 29454/59. Class 135. [Also in Group XXXII] A levelling valve for use in a vehicle airsuspension system comprises a housing 1 accommodating a longitudinally-movable valve element 28 controlling air flow between ports 13, 22, 21 connected respectively to the air supply, to an air spring and to exhaust, and rotary cam, crank or like means 5 extending transversely through and journalled in the housing and carrying an operating lever 9, the valve element or an extension thereof having an operable connection with the cam or like means. When the element 28 is displaced to the right it first lifts a disc valve 25, preferably of resilient material, from its seat 23 to permit air from the port 13 to flow past a non- return valve 14 through a port 20 and a groove 18 to the port 22. Further movement lifts a second valve 26 from its seat 24 to provide a greater rate of flow. Movement of the element in the opposite direction connects the spring to exhaust by uncovering the end of a bore 29 leading to the exhaust port 21 through a passage 30, a port 19 and grooves 17, 31. The crank 5 has a pin 8 fitted with a bush 32 to engage the element 28 and may be reversed to allow left or right-hand operation of the valve. A cam may be substituted for the crank, the element 28 then being spring-loaded.</p> |
