Fig. 182.
Fig. 183.
The steam end of the ordinary single steam pump, and also of the duplex pump, differs from the steam cylinder of the steam engine in that the former has four ports to each cylinder, i. e., two steam ports and two cushioning ports as shown hereafter in figures.
Under the division of the work allotted to the “Steam Pump” will be found all necessary further notice of the steam ends of Pumps.
Pump Valves. The valve apparatus is perhaps the most important part of any form of pump and its design has a material bearing upon its efficiency.
