Abstract: A nozzle for a pump comprises an inner tube (18) and a housing (1,10) with an end wall in which is formed an elliptical outlet (13). The tube (18) is provided with an elliptical opening (21). The outlet and opening are off center and can be brought into registry by rotating the tube (18). Such rotation is effect by means of a sleeve (22) mounted on the housing, connected to the tube (18) by means of a slot (35) receiving a projection (29) on the tube. The sleeve is rotated by means of an axially movable cam follower engaging in a part helical cam surface (24).

Abstract: A method of enhancing the corrosion resistance of sintered stainless steel, particularly against attack by acids, such as acetic acid, under non-oxidizing conditions. The sintered stainless steel is activated, for example by treatment with acid and is then treated with a phosphate containing solution. The sintered stainless steel has improved resistance to subsequent attack by acid.