| 摘要 |
The invention relates to a pressure feed line for concrete, particularly for use in concrete distributor masts of mobile and stationary concrete pumps. Pressure feed lines of this type generally contain an end hose (12) arranged on the mast tip (10) of the distributor mast, which points down with its outlet aperture (16), via which the transported concrete is discharged on the construction site. In order to avoid undesirable demixing in the end hose, even if the concrete is being pumped slowly, is stiff or low in sand, it is proposed, according to the invention, that an expansion throttle (18) which can be spread open under the effect of the exiting concrete is arranged in the region of the outlet aperture (16) of the end hose (12).
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