Pressure actuator diaphragm casing with air passages
US6827001B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2003 |
| Grant date | Dec 7, 2004 |
| Priority date | — |
| Expiry date | Feb 6, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control valve pressure actuator of the pressure-to-close type is provided with a housing in which an upper diaphragm casing thereof includes one or more air passage channels. Each of the air passage channels facilitates circulation of air above a diaphragm within the pressure actuator at all times, including when the diaphragm is in a fully open position. By permitting the circulation of air above the diaphragm even when in a fully open position, adjacent an inside surface of the top of the upper diaphragm casing, there is not a tendency for the diaphragm, biased toward the open position by springs, to stick to the inside surface of the top of the upper diaphragm casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.