Push button for metered flow
US6425145B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2001 |
| Grant date | Jul 30, 2002 |
| Priority date | — |
| Expiry date | Sep 21, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE03D3/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
By depressing a push button (13), a user deforms a flexible diaphragm (30) and thereby causes an incompressible fluid to flow from a first actuation-chamber segment (42) through openings (48) in a divider wall (46) and into a second chamber segment (44). That flow deforms a second flexible diaphragm (40), which accordingly causes an actuator shaft (58) to break the seal formed by an O-ring (57) and thereby permit flow from a main valve inlet (11) through a main valve outlet (12). When the user releases the push button (13), an actuator check valve (50) prevents the incompressible fluid from returning through the divider-wall openings (48) to the first chamber segment (42). The actuator therefore returns only slowly, through a bleed orifice (72). A pressurizer conduit (86) communicates the valve's outlet pressure to a stop chamber (82) and thereby causes the position of a stop member (76) to be dependent on that pressure. The position of the stop member (76) determines the length of the button travel and thus the time required for the valve to close. This reduces the effect of inlet pressure on the amount of fluid that one valve operation causes to be delivered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.