| 摘要 |
<p>A positive displacement pump particularly useful in pumping viscous fluids which may or may not contain gases, including water vapor, and/or suspended solids in which the actual flow equals the theoretical maximum flow through a check valve associated with the pump, said pump including a piston having a plug valve incorporated therein which has limited reciprocable movement within an extension of the piston, and, also, within a cage which is reciprocable within said extension, the flow area within the piston downstream from the plug being at least equal to the flow area past the plug.</p> |
