Pilot-operated pressure regulator valve
US4442680A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1982 |
| Grant date | Apr 17, 1984 |
| Priority date | — |
| Expiry date | Apr 23, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7768
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A pilot-operated pressured regulator valve includes a main valve for controlling refrigerant flow in a refrigeration suction line. A pilot valve which is responsive to evaporator pressure controls a flow of high pressure refrigerant to the main valve for modulating the main valve. A bleed is provided for bleeding the high pressure refrigerant from the main valve. A solenoid-actuated shut-off valve controls the bleed flow from the main valve. The shut-off valve is selectively closed for maintaining the high pressure refrigerant in the main valve for closing the main valve. A bleed flow of high pressure is provided to the main valve when the shut-off valve is closed in order to maintain the main valve closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.