IMPROVEMENTS IN THE ARRANGEMENT OR CON- STRUCTION OF DOUBLE-ACTING STEAM PUMPS
Year: 1877

page_text: LETTERS PATENT to Peter Burt, of Glasgow, in the County of Lanark, North
Britain, for the Invention of "IMPROVEMENTS IN THE ARRANGEMENT OR CON-
STRUCTION OF DOUBLE-ACTING STEAM PUMPS."
Sealed the 23rd November 1877, and dated the 1st June 1877.
PROVISIONAL SPECIFICATION left by the said Peter Burt at the Office
of the Commissioners of Patents on the 1st June 1877.
PETER BURT, of Glasgow, in the County of Lanark, North Britain. "IM-
PROVEMENTS IN THE ARRANGEMENT OR CONSTRUCTION OF DOUBLE-ACTING STEAM
PUMPS."
This Invention, which relates to improvements in the arrangement or construc-
tion of double-acting steam pumps, consists of a vertical cylinder fitted with a
piston, piston rod, and slide valve for driving the same, carried on the upper part of
a vertical framing. One half of the framing constitutes the water, chest, and the
other half the air vessel.
The piston rod is attached to a vertical plunger in the pump situated beneath it.
From the respective valve chests of the pump branches lead to the water chest and
air vessel.
The valve chests are arranged in front of the pump barrel, one above the other,
and the valve seats are fitted horizontally therein, in which position they are held
by keys or wedges, on loosening which the valve seats are or may be at once
removed.
The crank shaft passes through a bearing in the water chest, being also supported
in another bearing at the outer end.

page_text: Figure 1 represents a front elevation or a pump arranged or constructed according
to my said Invention.
Figure 2 is a vertical section of the framing of the pump, and of the pump barrel
and plunger.
And Figure 3 is a section of the valve chest, drawn to a larger scale than that to
which Figures 1 and 2 are drawn.
A vertical cylinder A fitted with a piston, piston rod a, and slide valve a¹ for
driving the said piston are mounted upon the upper part of a hollow vertical
framing B, having its interior divided into two chambers C, D, (see Figure 2). One
of these chambers C constitutes the water chest, and the other chamber D con-
stitutes the air vessel. The inlet pipe E (Figure 2) leads from the liquid to be
forced or raised by the pump and opens into the water chest C, from which the
inlet branch E (Figure 1) is in communication with one of the valve chests of the
pump, the outlet branch F leading from the other valve chest, and opening into
the air vessel. The discharge pipe F leads from the air vessel to the place of
discharge.
The piston rod a is attached to a vertical plunger G (Figure 2) working in the
pump barrel H. I prefer to construct the said plunger as shewn in Figure 2. The
end of the plunger rod is screwed to receive screw and lock nuts g, g², g³, between
which is carried the plunger, consisting of annular metal plates h, h, h, having
between them discs of india-rubber i, i. By screwing up the nuts the metal plates
h, h, h, are forced together, which by compressing the discs of india-rubber between
them cause the said discs to press water-tight against the interior of the pump
barrel. Although I prefer this construction of plunger yet I do not limit myself
thereto; as any other suitable construction of plunger may be used with my
improved pump.
The valve chests I are arranged in front of the pump, as shewn at Figure 1, one
above the other. The valve seatings J (Figure-3) are not cast with the valve chests
but are made separately, and are fixed therein by being slidden into horizontal
grooves j, formed in the said valve chests, the said seats being secured in place by
keys or wedges, preferably of hard-steel. When it is desired to repair or replace
the valve seatings-they-can-easily-be-removed by loosening the keys.k, and sliding.
the said seatings from the grooves j.
_The crank shaft K of the pump is carried in a bearing L passing through the
-water-chest, and in a bearing Lat the outer end
بعد
-Having now-described-and-particularly ascertained the nature of my said
Invention, and. the system, mode, or manner in or under which the same is or may
be used or practically carried into effect, I would observe in conclusion that what
I consider to be novel and original, and therefore claim as the Invention secured to
me by the herein-before in part recited Letters Patent is,--
First. The general arrangement or construction of double-acting steam pumps,
herein-before described and illustrated in the accompanying Drawing.
Second. Fixing the valve seats of double-acting steam pumps in the valve chests
by sliding them into grooves in the said chests and securing them by wedges,

page_text: essentially as illustrated in and described with respect to Figure 3 of the accom-
panying Drawing.
In witness whereof, I, the said Peter Burt, have hereunto set my hand and
seal, this Twenty-ninth day of November, One thousand eight hundred and
seventy-seven.
לדתם.
DITD
PETER BURT.
(L.S.)