| 摘要 |
<p>PCT No. PCT/SE97/01203 Sec. 371 Date Dec. 23, 1998 Sec. 102(e) Date Dec. 23, 1998 PCT Filed Jul. 3, 1997 PCT Pub. No. WO98/01688 PCT Pub. Date Jan. 15, 1998The invention relates to a valve for changing the flow direction of a fluid in conduits, which conduct the fluid to and from, respectively, a heat exchanger. Heat exchangers used in systems where the cooling water is taken from natural streams, river water, sea water etc often have problems with clogging. A method of keeping the heat exchanger clean is to regularly backflush it, i e to reverse the flow direction for example a few times every day, so that silt and particles, which have got stuck in the inlet region of the heat exchanger, are flushed out the same way as they entered. The valve according to the invention comprises a cylindrical casing and a valve body (18) enclosed therein. The conduits, which conduct the fluid to and from, respectively, said heat exchanger, are connected to two diametrically arranged connection tubes in the respective end plate on the casing, and by rotation of the valve body substantially 90 DEG the valve body can be placed in two different positions, so that said fluid either is conducted via through passages (19 and 20) or via through passages (21 and 22).</p> |
