Method and apparatus for flushing the plunger of a positive displacement pump
US4086029A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 1976 |
| Grant date | Apr 25, 1978 |
| Priority date | — |
| Expiry date | Dec 6, 1996 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B2201/0208
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for flushing the plunger of a positive displacement pump which handles a suspension of abrasive particles. Flush liquid is introduced at two or more locations to the packing surrounding the pump plunger. The larger volume of flush liquid is introduced in front of the packing to wash abrasive particles from the plunger in the usual manner. A smaller volume is introduced intermediate front and back sets of packing rings. Initially the back packing rings provide the seal for the plunger, but when they wear, flush liquid from between the two sets of packing rings leaks past the back packing rings to furnish an indication of the wear. The front packing rings now provide the seal, and it is known that the back packing rings should be replaced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.