| 摘要 |
<p>A pressure control device for maintaining a constant predetermined excess pressure in a fluid dispensing container, which device comprises a first chamber, a fluid connection between the first chamber and the container, a valve with a closing member for releasing and closing said fluid connection and a resilient pressure element exerting said predetermined excess pressure onto the closing member in closing direction, the resilient pressure element comprising a second chamber being filled with a gas at the predetermined excess pressure and relative to which the closing member is movable, the first chamber being filled with a gas at a pressure higher than said predetermined excess pressure, while in use the fluid connection is released if the fluid pressure in the container drops below the predetermined excess pressure, so that gas flows from the first chamber to the container and the pressure in the container increases until the fluid connection is closed again by the closing member as a result of the increased pressure in the container, characterized that the closing member is movable in a reciprocated manner between an upper extreme position and a lower extreme position, whereby the fluid connection is closed, which extreme positions are defined by the width of a circumferential recess in the valve and the release position of the closing member is defined between the upper and lower closing positions. <IMAGE></p> |
