| 摘要 |
<p>The pump (18) has a barrel (36) including a bore (38), an inlet (42) and an outlet (44). Check valves (70,80) control the flow of fluid from the inlet to the outlet during reciprocation of a piston (50) within the bore (38). The piston (50) is driven by a cam (30) having a special profile cam surface with an idle surface (34) of at least 100 degrees. The flow area of the first check valve (70) is greater than that of the second check valve (80).</p> |
