| 摘要 |
<p>A valve control group for the continuous operation of a fluid or liquid pumping element (11,12) by means of a control air feeding (13,14), comprising a first, at least three-way, valve element (16), which is also movable in a discharge position (19), and which normally connects a control air source (13, 14) and an inner control chamber (17) of said pumping element (11, 12). The valve element (16) is driven (in 22, 23, 24) by the air over-fed in said inner control chamber (17) to drive said pumping element. A throttling element (18) is placed between said first valve element (16) and said control air source (13, 14) and is connected to the discharge valve; said throttling element receives continuously an air feeding and, selectively, discharge air through a duct (21) from said first valve element (16). <IMAGE></p> |
