Method of regulating a central or district heating plant by means of a differential pressure valve, and unit for working method
US5178324A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Nov 12, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7722
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A central heating plant (either single pipe or double pipe) supplies heat carrying fluid to several rooms, each having a radiator (5) provided with a thermostat valve (6). The plant has a differential pressure valve (11, 111) placed downstream of the radiators, with a closing device (24, 25) controlled by a membrane (23) for regulating the flow of heat carrying fluid in a passage (19) between an inlet (17) and an outlet (18). If the windows in several rooms are opened, the thermostat valves (6) will open, whereupon the differential pressure valve should regulate the combined flow, which a conventional valve cannot do since the pressure difference across the two surfaces of the membrane (23) is small even with full flow. This drawback is avoided by means of a differential pressure valve (11, 111) with an adjustable throttle (15) between the inlet (17) and the closing device (24, 25), and by adjusting the throttle, regardless of the pressure distribution, to allow the maximum amount of fluid to pass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.