| 摘要 |
Overpressure- and ventilating valve at an aeration device for supplying carbon acid to water in a water bottle (1), where the neck of the water bottle is provided with a fastening means (2) arranged to cooperate with a corresponding fastening means (3) of a pipe end (4) of the device, which pipe end is connected, via a controllable valve (7), with a gas bottle (6) comprising carbon dioxide, which valve is opened by a user by the help of a non-locking first control means (10) which may be pressed down or in so that gas flows from the gas bottle down into the water via a nozzle (9). The invention is characterised in that the overpressure- and ventilating valve (14) comprises a piston (16) which is movable in a sleeve (15), which piston is displaceable between a first, closing position and a second, opening, position, in that the piston (16) in the closing position is arranged to seal off an outlet channel (18) from the water bottle (1), arranged at a first end (17) of the sleeve (15), and in the opening position open the outlet channel (18), in that a second outlet channel (20) is arranged at the said first end (17) of the sleeve, arranged so that in the opening position of the piston (16) a connection between the first outlet channel (18) and the environment via the second outlet channel (20) is opened, in that a second control means (21) is arranged in the sleeve (15) and arranged to be displaceable in the sleeve towards and away from the first end (17) of the sleeve, in that a spring (22) is arranged between the piston (16) and the end (23) of the second control means (21) located in or at the sleeve, in that the said spring (22) has a spring constant such that the overpressure- and ventilating valve (14) opens when the first control means (10) is kept pressed down or in by a user and the pressure in the water bottle (1) is above a first predetermined value, in that a force is applied against the second control means (21) when the first control means is released by the user and has sprung back, which force is such that the overpressure- and ventilating valve (14) opens when the pressure in the water bottle (1) rises above a second predetermined value. |
