| 摘要 |
<p>An automatic recirculation valve (10) comprising: an inlet ( 16); a main outlet (18); a recirculation outlet (20); a main valv e element (78) responsive to flow between said inlet (16) and sai d main outlet (18); and a bypass valve element (32) responsive to movement of said main valve element for regulating the flow of f luid between said inlet (16) and said recirculation outlet (20), said bypass element (32) comprising an orifice opening (52a), cha racterised by means for counterbalancing the fluid pressure force s acting on said orifice opening (52a), said counterbalancing mea ns comprising a second orifice (52b) opening in said bypass eleme nt (32).</p> |
