Controlled dosing of liquid cryogen
US12031680B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2024 |
| Grant date | Jul 9, 2024 |
| Priority date | — |
| Expiry date | Jan 29, 2044 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2270/059
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An aseptic liquid cryogen dosing head has a liquid cryogen reservoir in communication with a dosing outlet. An electromagnetic actuator is attached to an upper end of a dosing valve stem and is operable to move the dosing valve stem to open and close the dosing outlet. An air-tight seal extends about the dosing valve stem and separates the liquid cryogen reservoir from a cavity between the seal and the electromagnetic actuator. A controller is operable to perform a head leakage test, including pressurizing the cavity with a pressure higher than a pressure within the reservoir, to check for leakage past the seal; and pressurizing the reservoir to check for leakage from the liquid cryogen reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.