Notes on the construction and working of pumps by Marks Edward Charles Robert

Author:Marks, Edward Charles Robert
Language: eng
Format: epub, pdf
Tags: Pumping machinery
Publisher: London : Technical Pub. Co. ; New York : D. Van Nostrand Co.
Published: 1902-03-25T05:00:00+00:00

Fig. 56.

Fig, 55 is an external view of a later type pulsometer, having hinged doors to allow of more ready and convenient access to the valves.

For attaining a more economical use of the steam the Pulsometer Company arrange their " Grel" cut-off valve at the upper end of the pump. A sectional illustration of the upper end of a pulsometer fitted with a Grel valve is given at fig. 56. The makers thus describe the arrangement :—

" The operation of the combined valve is as follows : Commencing at the moment when the left-hand chamber D

is full of water, and the distributing valve C has moved to close the right-hand chamber E and open the left-hand chamber D, the expansion valve being open, the full steam pressure enters the left-hand chamber D and partially empties it. During this time, steam has been entering the special chamber F through the orifices G and G^, thereby increasing the pressure therein, and as the water in the body of the pump falls there is a reduction of pressure without this chamber, the effect of which is to cause the movable part F of the expansion valve to rise and cut off the steam by closing the steam pipe. The expansion of the steam and the expulsion of the water continues until the chamber is nearly emptied, when the difference of pressures in the pump chambers brings over the distributing valve C By this time the escape of the steam from the chamber F permits the pressure of steam in the steam pipe B to depress the movable part of the valve, and the steam rushes in to expel in turn the water which has flowed into the right-hand chamber during the emptying of the left-hand chamber, the correct working of the valve depending on the proper manipulation of the regulating screws."

The " Aqua-Thrustbh."

Fig. 57 represents an external view, and fig. 58 a sectional view, of this pump, which is made by Messrs. W. H. Bailey and Co. Limited, of Albion Works, Salford. As will be observed, the spherical or ball valve for controlling the admission of steam in the pump last considered is in this machine replaced by a rocking plate or disc. In connection with the sectional view, the makers supply the following description :—

" The left-hand chamber is filling whilst the right is being emptied by the steam which is being admitted by the valve in the head of the pump. By the time the right-hand chamber is emptied the left one has filled; the valve is drawn to the right, and the steani now forces the water out of the left-hand chamber and through the delivery valves, and water rushes into the right-hand chamber through the suction valves."

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