Actuator mechanism for pump sealing apparatus
US5261786A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 5, 1991 |
| Grant date | Nov 16, 1993 |
| Priority date | — |
| Expiry date | Mar 5, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/146
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A centrifugal pump of the hydraulic sealing type has a novel and improved sealing apparatus for establishing a hydraulic seal and limiting the flow of liquid from a pump casing into a reservoir or seal housing at one end of the pump casing, and a valve assembly in the seal, housing has a valve member normally urged into engagement with the seal housing to isolate liquid in the seal housing from the casing by washer-like spring elements. When the pump is activated and brought up to speed, centrifugal force-responsive pivot members will impart sufficient opening pressure to overcome the resistance of the spring members when the pump approaches operating speed to move the valve member away from sealed engagement with the seal housing; and when the speed is reduced below the operating speed level the spring elements will rapidly undergo deflection to cause the valve member to return to a closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.