350 MODERN STEAM PRACTICE . The air pmnps for the injection System are either single or in duplicate , lying at an angle ; when one pump is used it is … Fig . 223 . — Single Air Pump and Condenser . a , Condenser . b , Airpump , c , Air - pump cover . d , Exhaust passage . e , Hole for injection valves . generally placed forward in connection with the cylinders ; when two are adopted , one is forward and the other aft of the centre line of the…
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