Universal dispensing sack and valve assembly for pressurized dispensers
US4159789A · kind A · utility
Inventor
Key dates
| Filing date | Dec 14, 1977 |
| Grant date | Jul 3, 1979 |
| Priority date | — |
| Expiry date | Dec 14, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D83/68
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A pressurized dispenser includes an apertured vessel having a pressure chamber. An impervious sack of flexible material is nested within the chamber holding a fluid-like material to be dispensed. A neck as an integral part of said sack has a bore, projects through and is secured to said vessel and suspends the sack within the vessel, said neck defining a valve housing. A valve retainer encloses and overlies said neck and is secured to the vessel and contains an apertured primary valve gasket which is sealed over the neck and includes an apertured valve seat. A movable dispensing valve stem extends into the neck bore and projects out through the retainer and includes a valve stem normally biased against the valve seat and a nozzle. Pressurized gas is sealed within the pressure chamber for applying continuous pressure over the sack so that manual unseating of the valve stem releases controlled quantities of a fluid-like material through the neck, valve stem and nozzle. A modification includes normally-closed bleed passages formed in the neck interconnecting the pressure chamber and the neck bore for releasing limited quantities of pressurized gas through the nozzle for clearing the n…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.