Section 61.—PUMPING ENGINES, TYPES OF.
VERTICAL ENGINES.
[1114]. Vertical direct-acting, with either ram pump, ram and piston pump, or piston only. See [Section 56].
[1115]. Slot and crank motion, a variety of the last named. Of course any other kind of crank driving can be employed. See [Section 10].
The frame standards are frequently used as air vessels or valve chests.
[1116]. Direct-acting ram pump, with fly-wheel worked off crosshead pin.
[1117]. Direct-acting, with yoke crosshead; much used in the northern counties. The standards form air vessels and valve boxes, and they are made both of the piston and ram types.
[1118]. Three-cylinder, with yoke crosshead. Either the centre cylinder or the two side ones can be used as the steam motor cylinders, or the pumps.
HORIZONTAL ENGINES.
[1119]. The ordinary direct-acting engine, with either steam-moved or tappet valves, see Tangye’s “Special,” the “Coalbrookdale,” and others, in which the slide valve is operated by pistons controlled by auxiliary tappet valves on the same principle as [No. 1506].
[1120]. Direct-acting, with crosshead and guide bars between the cylinders.
[1121]. Two modifications of [No. 1120].
[1123]. Direct-acting, with rocking lever valve motion; see the “Worthington” and other “Duplex” pumps, in which two engines are combined so that one works the valve of the other.
[1122], [1124], & [1125]. Other forms of direct-acting engines.
[1126]. Horizontal compound direct-acting. The high-pressure cylinder, low-pressure ditto, and receiver are side by side, and the air pump and main pump in line with the steam cylinders.
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[1127]. Horizontal pumping engine, with yoked crossheads and crank in centre.
[1128] & [1129]. Horizontal compound lever engines.
[1130]. Davey’s patent vertical compound beam mining pump.
The Cornish beam pumping engine is too well known to need illustration.
In mining pumps the pump rod has occasionally been made of iron pipe and employed as the rising main.
[1131]. Geared pumping engine, with steam cylinder and pump side by side; the speed of the steam piston is reduced on the pump by spur gearing.