| 摘要 |
<p>To reduce noise in a displacement machine, e.g. a radial or axial piston or gear pump or motor, in which two separate arcuate valve openings 25, 27, connected respectively to the inlet and the outlet of the machine, are alternately swept, in use, by, and have a common interface with, valve orifices each connected to a respective working chamber of the machine, a passage 31, 32 is connected to one of the arcuate openings 27 and opens into the interface upstream of that opening and is swept, in use, by the valve orifices, and an adjustable throttle 33 is provided in that passage to control fluid flow between the passage and the said one opening. <IMAGE></p> |
