Fig. [466] represents the working barrel of a deep well pump, such as are used frequently in connection with the larger sizes of aermotors.
The tube is usually made of heavy brass—this is drawn so perfectly, as to size and smoothness, that a re-boring is not needed.
The plunger is here shown with four cup leather packings, with one ball valve; the bottom valve is also a ball with the seat resting within a conical coupling at the bottom, this with a leather packing makes a water tight joint.
Should any accident happen to the bottom valve it may be withdrawn by lowering the sucker-rod until the threaded portion comes in contact with the nut underneath the plunger. By turning the sucker-rod the nut engages the thread on the top of the lower valve-cage. Then by withdrawing the sucker-rod both valves may be drawn up for examination or repairs.
ROTARY AND
CENTRIFUGAL
PUMPS
Fig. 467.
