Title:
IMPROVEMENTS IN METERING DEVICES
Document Type and Number:
WIPO Patent Application WO1998053676
Kind Code:
A3
Abstract:
A device for delivering a controlled dose of a fluid to an outlet from a fluid supply at an operating pressure which includes an actively operable check valve and pressure exerting means to selectively exert first and second pressures on the check valve. When one of the first and second pressures is exerted on the check valve, the valve prevents the passage of fluid at operating pressure through the outlet. When the other pressure is exerted on the check valve, the valve permits the passage of spray fluid at operating pressure. Signal generating means to generate a control signal characteristic of the fluid operating pressure, and control means derive at least one of the said first and second pressures from the control signal.
Inventors:
RAWLINGS MATTHEW JAMES HAROLD (GB)
Application Number:
PCT/GB1998/001546
Publication Date:
March 04, 1999
Filing Date:
May 27, 1998
Export Citation:
Assignee:
RAWLINGS MATTHEW JAMES HAROLD (GB)
International Classes:
B05B1/30; B05B12/04; F16K5/04; F16K7/17; F16K15/14; (IPC1-7): A01M/
Foreign References:
| FR1227737A | 1960-08-24 | |||
| GB2164126A | 1986-03-12 | |||
| CH227839A | 1943-07-15 |
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