Dashpot mechanism for self-closing plumbing valves
US4165857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 1977 |
| Grant date | Aug 28, 1979 |
| Priority date | — |
| Expiry date | Nov 2, 1997 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/48
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved liquid-filled dashpot mechanism for use with a spring-biased, axially-displaceable valve stem, comprising: a housing having a passageway therein, a stem in the passageway adapted for reciprocation therein, a pair of annular rolling diaphragms disposed in spaced-apart, face-to-face relationship within the passageway in the housing, each diaphragm being respectively secured in fluid sealing relationship to the housing and the stem to collectively form an enclosed container for the dashpot liquid, a piston fixedly mounted on the stem intermediate the rolling diaphragms adapted for operative displacement within the housing and dividing the container into two chambers, a liquid metering passageway in the piston for providing fluid communication between the two chambers, and a check valve secured to the piston to permit the unidirectional flow of liquid therethrough, and when the dashpot liquid is not permitted to flow through the check valve, to direct the flow of dashpot fluid through the liquid metering passageway, thereby effecting dashpot action.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.