FIG. 55. Common form of force pump. S P, solid plunger; S V, suction valve; 

 C V, check valve; A C, air chamber; D P, discharge pipe. 



FIG. 56. 



(126) 



Common form of force pump. S V, suction valve; P V, plunger valve; 

 S B, stuffing box; A C, air chamber; D P, discharge pipe. 



