| 摘要 |
The invention relates to an arrangement for the pulsation-free delivery of a liquid medium from a storage reservoir to a consuming unit by means of at least two bellows pumps driven by hydraulic fluid acting directly on the pump's displacement elements with overlapping areas of identical hydraulic flows whose reversing elements can be connected alternately to the consuming unit or to the storage reservoir, a throttle element being inserted into the return line to the storage reservoir, the resistance of which throttle element is adjustable to the resistance of the consuming unit and serves to provide a practical solution for driving of the displacement elements of the bellows pumps by means of hydraulic fluid acting on the displacement elements, in order to make the arrangement usable even for higher liquid delivery pressures of up to approximately 300 bar or more, as are usual, for example, in high pressure spraying. According to the invention it is also proposed in order to feed the hydraulic fluid to the displacement elements of the bellows pumps to arrange (lacuna) on the side of the displacement elements which is not acted upon by the hydraulic medium between the drive for the displacement elements and the servo parts, by means of which the hydraulic fluid drawn off from an auxiliary circuit is so regulated that the speed of lift of the displacement elements matches the speed of lift of the slide of the servo valves. <IMAGE>
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