| 摘要 |
<p>916,624. Valves. CITROEN S. A., ANDRE. April 5, 1961 [Nov. 18, 1960], No. 12130/61. Addition to 854,716. Class 135. [Also in Group XXXII] An hydraulic distributer for use in apparatus for automatically levelling the frame of a motor vehicle comprises a body portion 1 comprising a pressure-fluid inlet connection 4, an outlet connection 5 to exhaust, and a connection 3 to the working pipe, a spool valve 2 determining whether the connection 3 is isolated, as shown, or is connected, according as to whether the spool is moved to the left or to the right, to one or other of the connections 4 and 5. The spool 2 extends at either end into chambers formed between the body portion 1 and diaphragms 6 and 6a, the diaphragms 6 and 6a being positioned, respectively, between discs 7 and 8, and 7a and 8a. Light springs 17 and 17a are interposed between the discs 7 and 7a and annular plates 15 and 15a respectively, pressing the latter against the body portion 1. The discs and diaphragms are positioned on each side between screwed members 10 and 10a and circlips 9 and 9a respectively and dust covers 11 and 11a are fitted on each side. Calibrated orifices 16 and 16a in the plates 15 and 15a register with annular grooves 13 and 13a in the body portion, the grooves being connected by a passage 12 which communicates through a passage 14 to a supply of liquid at atmospheric pressure. The member 10a is. shaped to facilitate connection to a control member. If the spool 2 is moved, say in the direction of the arrow f, the plate 15a is moved away from the body 1 by a shoulder 18a and liquid is forced through the throttling orifice 16 from the left-hand chamber into the right-hand chamber. The return flow of liquid is not impeded because the pressure of the returning fluid moves the plate 15 away from the body member, until the mid-position is reached. Similar conditions obtain when the spool is moved in the other direction.</p> |
