Suck back valve
US5938119A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 1998 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Mar 2, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K23/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A suck back valve is proposed which prevents change in the amount of fluid which is sucked by the suck back valve, and which improves response accuracy of a diaphragm, together with accurately controlling a displacement amount and a displacement speed thereof. A diaphragm displaceably disposed confronting an interior of a flow passage is formed from a first membrane and a second membrane stacked on the first membrane, wherein the first membrane is sucked into contact with the second membrane through holes defined in the second membrane, by activation of a negative pressure generating source which is connected to a chamber through a passage, and wherein the form of the first membrane is maintained by the second membrane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.