and exhaust valves are of gun metal , and on the double - beat construction . Their areas are as follows : — = - jtjth area of cylinder . Steam valve, . 5 ° s ( l - i n - = iVth > > Equilibrium valve , . 50 , , — iV - h > > Exhaust valve, . „ piston rod and pump rod are connected with a crosshead… … top of the pump , as in ordinary Fig . 131 . — Sectional Elevation of Pump . plunger pumps for colliery pur - a , Suction pipe . b , Suction - valve ehest , c , Delivery - poses . The area of each plunger valve ehest , d , Plunger , e , Stuffing box and gland . f , Stand pipe . is 132 square inches…
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