Piston pressure-type vacuum breaker
US5125429A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1991 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Jan 23, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7841
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pressure-type vacuum breaker for use in a fluid flow line has a housing defining a central bore and an inlet, an outlet and a discharge vent. A piston assembly disposed within the central bore is movable within the bore between first and second positions. In the first position of the piston assembly, the inlet is closed, the discharge vent is open and the outlet is in communication with the discharge vent and the atmosphere. In the second position of the piston assembly, the discharge vent is closed, the inlet is open and the outlet is in communication with the inlet, thereby to permit liquid flow between inlet and outlet. The position of the piston assembly is in predetermined response to pressure of liquid at the inlet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.