Patent ID: 6161580
Filing Date: 2000-12-19
Classification: A01J,Y10T

Abstract:
A pulsator comprising:a valve element;a first chamber;a second chamber;a first circuit having a first outlet and a second outlet which, by displacement of the valve element, are arranged to be connected alternately to a first source of a first pressure level and a second source of a second pressure level, respectively, the valve element being displaceable by means of a pressure difference between the first and second chambers; anda second circuit which is arranged to provide said displacement of the valve element and which comprises a first inlet connected to the first source and a second inlet connected to the second source, the second circuit being designed to take one of a first stable position at which the first inlet is connected to the first chamber at the same time as the second inlet is connected to the second chamber or a second stable position at which the first inlet is connected to the second chamber at the same time as the second inlet is connected to the first chamber,wherein the second circuit comprises two valve members having respective first and second control inlets each comprising a closing member that at a rest position closes the control inlet and which are arranged to enable change-over of the second circuit from one of said stable positions to the other of these positions by means of a connection of short duration to the second pressure source by an opening of the closing member of the respective control inlet.