596 HYDRAULICS AND ITS APPLICATIONS 



it has, however, become possible to adopt much higher speeds, even with 

 automatic valves. 



One modern type of high-speed pump which has proved itself capable 

 of excellent results is the Gutermuth (Fig. 283). 1 The illustrations show 

 a sectional plan and elevation of one of a pair of three-throw pumps of 

 this type, having plungers 6f inches diameter by 16 inches stroke and 

 delivering 1,000 gallons per minute against 750 feet head at 180 revolu- 

 tions per minute. Each pump is driven from a 275 H.P. three-phase 

 motor through a flexible coupling. The design is very compact, the pump 

 bodies being mounted on a suction air vessel of cylindrical form, which 

 also acts as a bedplate. On this air vessel is cast a branch flange for 

 connecting up to the suction main. On top of one of the pump bodies 

 is bolted a delivery air vessel, having flanged branches to connect to the 

 pump bodies, and with the end flanged to connect to the retaining valve 

 on the delivery main. 



The connecting rods are of cast steel with marine type babbited ends 

 or the crank pin, and gun-metal wedge adjustment boxes for the cross - 

 head end. The plungers are of gun-metal, and are supported in gun-metal 

 bushed glands and neck rings. 



Forced lubrication is fitted throughout, while the two delivery air vessels 

 are supplied by an independent electrically-driven two-stage air charger of 

 the Reavel type, the compressor being capable of compressing 5 cubic 

 feet of free air per minute to a pressure of 350 Ibs. per square inch. 



The valves, which are of the Gutermuth type and are perhaps the most 

 interesting part of these pumps, are contained in cylindrical bronze valve 

 seats, each pump having one set for suction and one for delivery. These 

 are held in place and tightened by means of wedges which are readily 

 accessible when the valve covers are removed. 



The sectional end view of Fig. 283 shows very clearly the straight ai 

 unobstructed passages offered to the water in this type of pump. 



Frictional losses are thus low ; the lightness of the valve and its smt 

 opening tend to reduce shock on closing ; and the possible speed of rotatioi 

 is correspondingly increased. 



The high speed at which these pumps can be run, as a direct result 

 the valve action, permits of a design which takes up considerably 1< 

 floor space than the ordinary slow running pump, the actual overall lenj 

 being, in this case, 11 feet 8 inches X 8 feet 6 inches. It also allows tl 

 pump to be direct connected to the motor, which, though adding somewl 

 to the expense of the latter, does away with transmission gears which 



1 By courtesy of the manufacturers, Messrs. Eraser & Chalmers, Ltd. 



