Anti-hammer pilot operated valve with tortuous flow path between inlet and pilot chamber
US5732929A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1996 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Nov 26, 2016 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/404
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A soft closing liquid valve of the pilot control type including an inlet chamber, an outlet chamber, a third pilot chamber, a first conduit for liquid communication between the inlet chamber and the third chamber and a second conduit for fluid communication between the third chamber and the outlet chamber whereby the liquid flow rate through the first conduit is reduced by the conduit including a tortuous path means so that the flow rate into the third chamber is substantially reduced and when the second conduit is closed causes the third chamber to fill at a slower rate than in conventional pilot controlled valves, the resultant slow rate of change of pressure causing a slow closure of the flow path between the inlet and outlet chambers by a diaphragm thus minimizing water hammer. The first conduit may include a third conduit and a fourth chamber in liquid communication with the tortuous path, the third conduit acting as a filter means for the tortuous path by selecting its cross-sectional size to be smaller than that of the tortuous path. In another embodiment, the first conduit is formed through and using the peripheral bead of the diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.