IMPROVEMENTS IN AND CONNECTED WITH PUMPS FOR GIVING MOTION TO GASES AND THE VAPOUR OF VOLATILE FLUIDS
Year: 1879

page_text: LETTERS PATENT to Frederick Noel Mackay, of Liverpool, in the County of
Lancaster, Engineer, for the Invention of "IMPROVEMENTS IN AND CONNECTED
WITH PUMPS FOR GIVING MOTION TO GASES AND THE VAPOUR OF VOLATILE
FLUIDS."
ealed the 2nd April 1880, and dated the 9th October 1879.
PROVISIONAL SPECIFICATION left by the said Frederick Noel Mackay at
the Office of the Commissioners of Patents on the 9th October 1879.
FREDERICK NOEL MACKAY, of Liverpool, in the County of Lancaster, Engineer.
"IMPROVEMENTS IN AND CONNECTED WITH PUMPS FOR GIVING MOTION TO GASES
AND THE VAPOUR OF VOLATILE FLUIDS."
The said Invention relates more especially to the construction and arrangement
of the valves and valve chambers of pumps employed for exhausting and forcing
gases and the vapours of fluids, and has for its main objects to ensure durability
and freedom of action in the valves, to reduce the space between the inlet and
outlet valves, and between the valves and the cylinder, to so construct the valves
and valve chambers that access to the said valves may be facilitated, and to provide
simple and efficient means for moving and retaining the valves from their seats
until the pump is properly started.
First. I combine together an inlet and outlet valve working on or guided in
their motion by spindles, with a pump cylinder having one port or opening situated
between the said valves, so that the gases or vapours pass through the said port or
opening, both when entering and leaving the cylinder. When a double acting
cylinder is used two sets of valves and a port or opening at each end are
employed.
Second. I construct one of the valves, preferably the delivery valve, flat or
nearly so, and the other valve curved or so shaped that the space between the two
valves when closed shall be very small. The said valves are constructed of thin
sheet metal faced with leather or the like where they rest on their seats, and
springs are provided to retain them in position.
Third. I construct one of the valves, preferably the delivery valve, of larger
diameter than the other valve, and so arrange the said valves in the valve chamber
that when the cover to the chamber is removed, the valve nearest the cover may
be withdrawn through the opening so made, and the other valve may be removed
through the seat of the first mentioned valve.
Fourth. In combination with the pumps constructed as above described, I make
use of screw, excentric, or other suitable appliances for lifting and retaining the
suction valves from their seats until the pump is properly started.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frederick Noel Mackay in the Great Seal Patent Office on the 9th
April 1880.
FREDERICK NOEL MACKAY, of Liverpool, in the County of Lancaster, Engineer.
"IMPROVEMENTS IN AND CONNECTED WITH PUMPS FOR GIVING MOTION TO GASES
AND THE VAPOUR OF VOLATILE FLUIDS."
The said Invention relates more especially to the construction and arrangement
of the valves and valve chambers of pumps, employed for exhausting and forcing
gases and the vapours of fluids, and has for its main objects to ensure durability
and freedom of action in the valves, to reduce the space between the inlet and
outlet valves, and between the valves and the cylinder, to so construct the valves
and valve chambers that access to the said valves may be facilitated, and to
provide simple and efficient means for moving and retaining the said valves from
their seats until the pump is properly started.
First. I combine together an inlet and outlet valve working on or guided in their
motion by spindles with a pump cylinder having one port or opening situated
between the said valves, so that the gases or vapours pass through the same port or
opening both when entering and leaving the cylinder. In double acting cylinders
two sets of valves and a port or opening at each end are employed.
Second. I construct one of the valves, preferably the delivery valve, flat or
nearly so, and the other valve curved or so shaped that the space between the two
valves when closed shall be very small, or both valves may be curved to effect
the same object. The said valves are constructed of thin sheet metal faced with
leather or the like where they rest on their seats, and springs are provided to
retain them in position.
Third. I construct one of the valves, preferably the delivery valve, of larger
diameter than the other valve, and so arrange the said valves in the valve chamber
that when the cover to the chamber is removed, the valve nearest the cover may
be withdrawn through the opening so made, and the other valve may be removed
through the seat of the first mentioned valve.
Fourth. In combination with the pumps constructed as above described, I make
use of screw, excentric, or other suitable appliances for lifting and retaining the
suction valves from their seats until the pump is properly started.
The accompanying Drawing, partly in section and partly in elevation, shows as
much of a pump and gear as is sufficient to illustrate my Invention. a, pump
cylinder; b, piston; c, chamber bolted to the cylinder a and provided with a valve
box at each end; d, way or passage through which the gases or vapours enter the
chamber and pass to the cylinder; e, ways or passages through which the gases or
vapours pass away from the cylinder.
Under the first part, I use the inlet valves fand outlet valve g guided in their
motion by the spindles h, i, in combination with the pump cylinder a, having a
port or opening ; situated between the said valves fand g, so that the gases or
vapours pass through the same port or opening both when entering and leaving the
cylinder.
Under the second part, I construct the delivery valve g flat and the suction
valve f curved or dished, so that the space k between the said valves when on their
seats shall be very small. The said valves are constructed of thin sheet metal discs
Z faced with leather m rivetted thereto. Instead of leather, wood or other like
agent may be used. Spring n serves to keep the valves to their seats.
Under the third part, I construct the delivery valve g of larger diameter than
the suction valve f, and form the valve opening for the cover o and the seatings
p, q, of diminishing size, in such manner that when the said cover o is removed
the delivery valve may be passed through such opening to and from its seating; the

page_text: suction valve in the absence of such delivery valve may be withdrawn through the
seating p and cover opening o.
Under the fourth part, I use in combination with pumps constructed as above
described screw gearing r, which is operated by the hand wheel and bevel gearing 8,
so as to lift the suction valve f from its seat and retain it until the pump is
properly started. The handwheel &' operates similar screw gearing for lifting the
suction valve at the opposite end of the cylinder from its seat. Both sets of screw
gear may be actuated by one bandwheel. Excentric or other suitable gear may be
substituted for the screw gear shown; t are guides for the valve spindle; u, buffer
of horn or suitable material to arrest the motion of the delivery valve.
Having now described and ascertained the nature of the said Invention in such
manner that others will be enabled to carry my improvements into effect,
I claim,―
First. Combining valves with pump cylinders, substantially as set forth.
Second. Constructing, arranging, and combining pump valves, substantially as
and for the purpose set forth.
Third. Constructing and arranging valve boxes, covers, valve seats, and valves,
substantially in the manner and for the purpose set forth.
Fourth, Screw, excentric, or like gear operating in combination with pumps,
valves, substantially as and for the purposes set forth.
In witness whereof, I, the said Frederick Noel Mackay, have hereunto set
my hand and seal, this Eighth day of April, in the year of our Lord One
thousand eight hundred and eighty.