Hartcliffe and Malkin
From Graces Guide
1899 'Messrs. Hartcliffe and Malkin, Salford, Manchester, have brought out a special design of their patent straight full-way valve, with a solid bottom, the object of which is to prevent any possibility of leakage. In this valve an ingenious arrangement of angle blocks is introduced, so designed as to compensate for any slight wear of the valve faces, and the adjustment of the valve plates is effected by means of a nut and coil on the end of the spindle.'[1]
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