S. S. Welch and Co

January 1888. Triple expansion yacht engines.

1888.

S. S. Welch and Co, maker of triple expansion engines, of Plymouth

1888 Description and engravings of non·condensing triple - expansion marine engines, fitted by Welch Co., of the Docks Iron Works, in the new Millbrook steamer Iolanthe. These engines presented some remarkable features, 'amongst which, it may be mentioned, that packing rings have been entirely dispensed with both in the piston val ves and pistons ; the latter, however, have a series of grooves turned on them to check leakage. The piston valves are designed so that the glands through which the valve-rods, pass a r exposed to the pressure of exhaust steam from the cylinders only, and do not, therefore, require as tight packing as would otherwise be necessary. By these devices the engine friction has been reduced to a minimum and the engines have run with 24lb. of steam pressure only in the boiler; though the normal working pressure is 160 lb.
The reversing gear is peculiar, all the valves being worked off two eccentrics only, rendering the engine very compact in a fore-and-aft direction. Reversing is effected by an ordinary spiral slotted sleeve which alters the position of the eccentrics realtively to the cranks. ....'

Later became the Millbury Pier Engineering Co.

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