| 摘要 |
<p>A vacuum regulating device for regulating the vacuum in milking installations with a main valve and an auxiliary valve. A main valve chamber(4) is connected to the outside and via a valve seat (5) to the vacuum pipe(3). A control chamber (10) is separated by a first diaphragm (9) from the main valve chamber (4) and a second diaphragm (17) from the outside. Both diaphragms (9, 17) are connected to a movable supporting piece (18) which carries the main valve body and which has active surfaces (18a, 18b) of different size facing towards the main valve chamber (4) and the outside. The position of the main valve is dependent on pressure in the control chamber (10) of which the pressure is determined by the auxiliary valve which is disposed in the supporting piece (18). The auxiliary valve has two auxiliary chambers (13a, 13b) separated by an auxiliary diaphragm (12) to which is attached the auxiliary valve body (11). The first is connected to the vacuum pipe (3), the second to the outside. The position of the auxiliary valve is dependent on the pressure difference in the auxiliary chambers (13a, 13b) and the force of an adjustable spring (15). Control chamber (10) and first auxiliary chamber (13a) are connected to the vacuum pipe (3) via a centrally extending channel (19).</p> |
