| 摘要 |
<p>A fixed link between water inlets and outlets is substituted by a drilled hole, into which a control housing (CH) (28) is built. The CH has a control piston (30) with an average-diameter center area carried on the CH's inner radial narrow part (36). A vertical drilled hole links an underside of an annular piston (38) to the pressure side of a pump.</p> |
