Low leakage plunger assembly for a high pressure fluid system
US8757047B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2008 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Apr 15, 2031 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M59/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A fluid control device for use in a high pressure fluid system, the device including a device body with a cavity and a high pressure circuit, a plunger positioned for reciprocal movement in the cavity, and a leakage reduction cap mounted to the plunger for reducing fluid leakage flow. In one implementation, the leakage reduction cap includes a flexible portion positioned between the device body and the plunger, and defining an annular clearance gap between the leakage reduction cap and the device body. The flexible portion of the leakage reduction cap resiliently flexes radially outwardly in response to fluid pressure forces to reduce the annular clearance gap so as to minimize fluid leakage flow through the annular clearance gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.