Fluid flow-controller with improved diaphragm
US5295662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1993 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Mar 22, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K7/16
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A diaphragm type fluid flow controller comprises a valve body having formed therein an inlet and an outlet passage, the passages communicating with a valve chamber formed in the valve body. The valve chamber is sealed by a flexible diaphragm. A threaded valve stem is rotated by a handle to cause pressure to be applied to the diaphragm to selectively open or close the valve. A stop ring limits movement of the valve stem in the direction of the diaphragm so that the pressure applied to the diaphragm is limited once the valve is closed. The diaphragm comprises a plurality of nested thin metal dome-shaped plates having upturned peripheral edges which are clamped between the stop ring and a rim formed on the valve body at the upper extent of the valve chamber. The plural plates insure air-tightness of the valve chamber because any rotation of the stop ring, resulting from tightening the valve after closure, is not transmitted to the lower-most diaphragm plate. The upturned edges make individual diaphragm plates easier to handle. In addition, plural nested plates may be assembled and inserted into a valve as a unit. The upturned edges of the plates make it easier to grip and remove the p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.