Diaphragm valve air vent device for water systems
US4299248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1979 |
| Grant date | Nov 10, 1981 |
| Priority date | — |
| Expiry date | Mar 13, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7374
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An air vent device for automatically venting entrapped air from hot water heating and chilled water cooling systems. The device can vent a large volume of air in a relatively short time by using a large vent opening, controlled by a pilot valve operated diaphragm venting valve. The pilot valve, actuated by a spring and connected to a float, permits air pressure within the device to pass to the rear of the diaphragm valve to maintain it in a closed position during normal operation of the system. When the float drops to a predetermined position the float weight overcomes the spring force and the pilot valve vents the rear side of the diaphragm valve to atmosphere, allowing it to open, thereby venting the air collected in the device to atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.