Sliding gate valves and components thereof.

摘要

Valve plates for sliding gate valves have constructions exemplified by Figure 1 in which the refractory components are mounted in metal trays. The valve plate (18) has two refractory plate members (20, 21) bedded on cement (19) in the bottom of the tray (17); plate member (20) is orificed (at 14) to convey molten metal to an undermounted nozzle (16), which is joined to the plate member (2) by a male and female structure (28) such that the male part (29) of the plate member (20) protects the vulnerable inlet end of the nozzle (16). The plate member (20) - but not plate member (21) - is designed to be contacted in service by molten metal and is replaceably secured in the tray (17) which has apertures (32) for access of tooling used to displace the plate member (20) out of the tray when replacement of the palte member (20) is necessary.