Abstract: A flow valve comprising two valve members having contacting flat surfaces, one of the members containing spaced inlet and outlet fluid passages and the other of the valve members containing an intermediate passage, the valve members being mounted such that relative rotation of the flat surfaces can be effected to locate the intermediate passage either fully or partially in or out of communication with the inlet and outlet passages, and a channel is provided around at least part of the periphery of the contacting flat surfaces to receive molten metal and dross leaked between them.

Abstract: A casting is made from a low melting point alloy having a solidus temperature in the range of 35.degree.-300.degree. C. by subjecting a charge of molten alloy to pre-pressurization then delivering the charge at a flow rate of 0.1 to 1 kg/sec into a die and maintaining the metal in the die under pressure for a time in excess of that required to fill the die.

Abstract: A soldering flux which comprises an aqueous solution containing a mixture of 25 - 75% by weight of a hydrobromide of an aliphatic hydroxyamine and 75 - 25% by weight of a hydrobromide of an aliphatic amine.