Dual function condensate drain trap for negative or positive pressure air handling unit
US6931882B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Jun 4, 2004 |
| Grant date | Aug 23, 2005 |
| Priority date | — |
| Expiry date | Jun 4, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F13/222
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A dual function condensate drain trap for positive or negative pressure air handling unit applicable in positive or negative pressure environments by switching connecting directions includes a drain trap which has a water inlet and a water outlet on two sides to connect to a drain pipe, and a valve seat and a retaining element located on the valve seat movable between a first position to be in contact with the valve seat and a second position to be away from the valve seat. When the pressure of water column in the water inlet is smaller than that of the water outlet, the retaining element is on the first position to form an air lock to prevent air from entering or escaping from air handling unit. By contrast, when the pressure of water column in the water inlet is greater than that of the water outlet, the retaining element is moved to the first position to drain water.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.