Fig. 561.
Fig. 562.
Fig. 563.
The action of the pulsometer is as follows: When all chambers and pipes are empty, the air check-valves have to be closed, and the globe valve opened for an instant; then steam will enter one of the chambers, expel the air, and condense, forming a vacuum. This operation being repeated several times, both chambers will be filled with water through the induction pipe. Each air-valve in the chambers must now be opened a little, to secure a regular and successive action, which will be recognized by the regular pulsations and smooth working of the steam-ball without rattling.
Steam, being now admitted, continuously enters the chamber not closed by the ball, and forces out the water through the discharge-valves, until its surface is lowered below the discharge-orifice. At that instant the steam begins to escape into the discharge-pipe, and condenses; thus a partial vacuum is formed in the chamber. The water in the other chamber now presses the ball, which rolls over and closes the first chamber, when water enters through the induction-valves to fill the vacuum. This operation alternately changes from one chamber to the other.
The principal parts of a pulsometer are shown in the seven figures upon this and the preceding pages.
Fig. [557] represents the regular flat valve, seat and guard, Fig. [558] the guard detached, while Fig. [559] is the plain flat rubber valve. The valve seat for clean water is shown in Fig. [560].
