Toggle linkage check valve
US5072753A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1991 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Jan 22, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7898
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A toggle linkage check valve including a housing having an inlet and an outlet and a sealing plug disposed within the housing and adapted for movement between a first, closed position for preventing flow of liquid between the inlet and the outlet, and a second, open position for substantially permitting flow of liquid between the inlet and the outlet. The check valve includes a spring assembly removably disposed within the housing. The sealing plug is mounted upon the spring assembly. The spring assembly includes a rod member and a means for biasing the rod member toward the sealing plug. In the first position of the sealing plug, the rod member lies substantially perpendicular to a plane of the sealing member across the inlet, and in the second position of the sealing plug, the rod member lies at an acute angle to the plane of the sealing member. The means for biasing acts upon the rod member to apply, to the sealing plug, a biasing force of a second degree less than the first degree, whereby the spring assembly acts upon the sealing plug to provide a maximum resistance against liquid flow from the inlet toward the outlet when the sealing plug is in the first, closed position and …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.