. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e (f), half of this water passing out into thecolumn pipe (d), the other half passing down and following the differentialplunger (h). The discharge valve (f) now being closed, the main anddifferential plungers which are connected by means of side rods moveagain to the right, the main plunger drawing the water through thesuction valve (e) and the differential plunger displacing its volume andforcing the same through the discharge passage (c) into the column pipe (d). The cross s
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. e (f), half of this water passing out into thecolumn pipe (d), the other half passing down and following the differentialplunger (h). The discharge valve (f) now being closed, the main anddifferential plungers which are connected by means of side rods moveagain to the right, the main plunger drawing the water through thesuction valve (e) and the differential plunger displacing its volume andforcing the same through the discharge passage (c) into the column pipe (d). The cross sectional areas of the main and differential plungers (j and h)are generally made in the proportion of about 2 to i so as to equalisethe work done on both the forward and return strokes. The side rods (g) THE RIEDLER PUMP. I^I connect the cross heads of the main and differential plungers and are always in tension, and in large pumps are furnished with a cast iron guide. It will be noticed that in front of the discharge (c) and connecting to the column (d) there is a clack valve. This is for the purpose of holding. the water in the column pipe when it is desired to take out the valvesor examine the interior of the pump. A clack valve is preferred for thispurpose as it will open automatically when the pump is restarted, whereasif a stop valve were used it might through carelessness be left closed andso cause damage to the pump. 132 MACHINERY FOR METALLIFEROUS MINES. The Riedler pump can be driven either by steam, air, water, orelectricity. At the Niagara Falls Water Works there is a Riedler drivenby direct connection with a Pelton wheel, the buckets of which are placedaround the rim of the flywheel on the crank shaft. This pump has acapacity of 6,000,000 gallons per 24 hours against a head of 358 ft. Inother cases an electric motor is placed direct on the crank shaft, thusavoiding all intermediate gearing. If a high-speed motor is used thengearing or belting is necessary, but this
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