| 摘要 |
<p>A fuel pressure regulator comprises a piston 14 moveable under the influence of the fuel pressure to control the degree by which an opening 17 is obscured. A return passage connects an outlet of a pump 10 to the inlet and the opening 17 is located in the return passage. An additional flow restriction 19 is located in the return passage downstream of the opening 17. Preferably the restriction 19 is variable, the piston 14 being slideable in a sleeve 12 which can have its angular or axial position adjusted to provide the variation of the restriction 19. The sleeve 12 may be located in a bore (21, figure 4) in a housing (22), and have collar (20) cooperating with bore (21) to define the restriction (19).</p> |
