Abstract: An apparatus for removing solid particles from cooling water having a tubular housing (1), a funnel-shaped trap sieve (4) attached to the inner housing wall with the tip facing in the flow direction, and a pressurized water sprayer (11). The sprayer includes a washer arm (14), concentrally rotatable about the downstream side (23) of trap sieve (4), and having at least one slit nozzle (15) directed toward the downstream surface (23). A suction tube (8) extends into a collecting chamber (10) of trap sieve (4). To prevent large particles from jamming rotating components, trap sieve (4) is cleaned by spraying water only against the downstream side. The tip of the sieve is defined by a cylindrical container (5) having a closed bottom (6). The intake end (9) of suction tube (8) extends into the container. Wash water is introduced into washer arm (14) through an inner end fixedly attached to a hollow flange (13) mounted on a rotary shaft (12) of pressurized spray apparatus (11).

Abstract: A retrieval device (6) is disclosed for retrieving spherically shaped cleansing bodies cyclically circulated through the cooling system of a tubular heat exchanger (2). The device has a cylindrical housing (8) subdivided into two chambers (12,13) by a filter plate (11). The end (21) of a drain tube (14) reaches into a chamber (12), while ends (19,20) of a feed tube (5), a discharge tube (7) and a rinse tube (17), respectively, into a second chamber (13). Two exteriorly driven shafts (23,24) are centrally mounted in the housing (8) and each has adjustable valve plates (32,34 and 33,35) mounted to seal against the upper and lower tube ends (19,21 and 20,22). The device (6) has three operating modes which are set by rotating the shafts to only two operational positions.

Abstract: An apparatus (8) is provided for retrieving spherically shaped cleansing bodies circulated through the cooling system of a tubular heat exchanger. It has a cylindrical housing (11) into which feed and discharge tubes (6,9) and associated extensions (14,15) reach. To achieve simplified operation, valve plates (20,21) are mounted on a central shaft (18) to form a seal flush against the angularly inclined ends of pipe extensions (14,15) by appropriately rotating shaft (18). Further a sieve plate (24) is fixedly mounted in housing (11) perpendicular to shaft (18). Shaft (18) may be rotated through 180.degree. and has three operative settings. In a first, control setting extensions (14,15) and cutout (25) are closed, in a second, flow-through setting all three are open, and in a third, retrieval setting extensions (14,15) remain open while cutout opening (25) is closed.