| 摘要 |
An improved sampling pump has utility for withdrawing contaminated flui d from a low pressure source and outputting cleaned fluid to a sampling container. The fluid pump assembly of the present invention includes an operator unit for reciprocating plunger, and a side body port positioned within the pump body for receiving a removable filter. The pump assembly includes a discharge check valve which is ideally positioned within the pump body for minimizing "dead areas" within the pump, but is also adjustable for controlling the downstream pressure generated by the pump. An operator unit for the pumping assembly may include a spacer attached to the operator piston for selectively controlling the pump stroke. The pump assembly preferably has a pump body inlet port substantially aligned with th e plunger axis. High pump reliability is obtained by the preferred filtering technique which cleans both the fluid supplied to the pump and the fluid supplied to the operator unit.
|
