| 摘要 |
<p>Method and dispensing pump of constant rate, for feeding compressible fluids, in the production of expanded polyurethanes. The pump comprises at least a first and a second pumping unit connected in parallel, provided with means of cooling the fluid that is to be pumped; the pump further comprises cam type control means acting in sequence on the pumping units, whose active profile, corresponding to the working stroke of the pumping unit, comprises a phase of compression of the fluid and a subsequent phase of dispensing at constant rate, and in which the compression phase of one pumping unit happens to coincide with a final portion of the dispensing phase of the preceding pumping unit. <IMAGE></p> |
