IMPROVEMENTS IN VALVES FOR STEAM ENGINES
Year: 1873

page_text: LETTERS PATENT to George Haseltine, of the International Patent
Office, Southampton Buildings, London, Doctor of Laws, for the
Invention of "IMPROVEMENTS IN VALVES FOR STEAM ENGINES."—A com-
munication from abroad by Henry Isaac Hoyt, of Norwalk, Con-
necticut, United States of America.
Sealed the 16th December 1873, and dated the 6th September 1873.
PROVISIONAL SPECIFICATION left by the said George Haseltine at the
Office of the Commissioners of Patents, with his Petition, on the
6th September 1873.
I, GEORGE HASELTINE, of the International Patent Office, South-
ampton Buildings, London, Doctor of Laws, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN VALVES FOR STEAM
ENGINES," a communication, to be as follows:-
The object of my Invention is to secure a simple and compact means
of arresting a piston valve moved partly by a tappet arm or other
mechanical contrivance, and partly by steam, when operating in connec-
tion with or independently of a condenser o vacuum chamber, however
obtained.

page_text: Heretofore separate cushion cylinders with intervening stuffing boxes
and springs have been employed, which were not only cumbersome and
costly, but easily put out of order.
In the accompanying Drawing a section of my improved valvo is
shown as applied to a direct acting steam pump.
A represents the steam chest; B, the cushion cylinder; O, its piston;
D, the main valve; E, the steam jacket; f, the main steam inlet; 9, 9,
the air cocks; 7, the main exhaust pipe; i, i, small ports in end of main
valve; j,j, grooves around the main valve communicating with small
ports i, i; k, k, safety ports opening into the exhaust to prevent steam
passing back of the piston; M, M, steam passages from main cylinder;
o, o³, main steam ports; p, p', main exhaust ports.
I accomplish the desired effect by attaching a piston C of different
diameter than the main valve D at each end of the main valvo rod to
work in its cylinder B, with the air cocks placed at varying distances
about an inch from the extreme end of the cylinder. As the main.
valve D moves forward its rod moves the cushion piston C over the port
of an air cock g, closing it and confining the air beyond within the
remaining space of the cylinder B, the resistance of which confined air
arrests its motion.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Haseltine in the Great Seal Patent Office
on the 3rd March 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
ITASELTINE, of the "International Patent Office," Southampton Build-
ings, London, Doctor of Laws, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of September, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty-
seventh year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said George Haseltine, Her special licence that I,
the said George Haseltine, my executors, administrators, and assigns, or
such others as I, the said George Haseltine, my executors, administrators,

page_text: and assigns,, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN VALVES FOR STEAM
ENGINES," a communication to me from abroad by Henry Isaac Hoyt,
of Norwalk, Connecticut, United States of America, upon the condition
(amongst others).that I, the said George Haseltine, my executors- or
administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describe and ascertain tho
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Scal Patent
Óffice within six calendar months next and 'immediately after the date of
the said Letters Patent.
NOW KNOW YE, that I, the said George Haseltine, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by tho
following statement, reference being had to the accompanying* Drawing
forming a part of this Specification, and which shows a section of my
improved valve applied to a direct acting steam pump :-
=
A represents the steam chest; B, the cushion cylinder; C, its piston;
D, the main valve; 'E, the steam jacket; f, the main steam inlet; 9, 9,
the air cocks; h, the main exhaust pipe; i, i, small ports in end of main
valve; j,j, grooves around the main valve communicating with small
ports i,i; k, k, safety ports opening into the exhaust to prevent steam
passing to the back of the piston; M, M, steam passages from main
cylinder; 0, 0, main steam ports; P, P, main exhaust ports.
The object of this. Invention is to secure simple and compact means
for arresting a piston valve moved partly by a tappet arm or other
mechanical contrivance, and partly by steam. This arrangement of a
piston valve is equally well adapted for use upon direct-acting engines
when operating with or without connection with a condenser or vacuum
chamber however formed.
When operating in connection with a condenser the cocks g, I, are
opened, and the valve is cushioned upon air trapped in the chamber B.
When operating without a condenser the air cocks are connected with
the exhaust steam passage, and a cushion is formed by the entrapped

page_text: steam. Although I prefer the construction shown in the Drawing, if
deemed advisable a plain head may be substituted for the bonetted
cylinder head, as shewn, in which case the cushion becomes a continua-
tion of the valve cylinder.
Having thus described my said Invention as communicated to me by
my forcign correspondent, and shewn how the same may be conveniently
and advantageously carried into practice, I wish it understood that I
claim,―
First. The herein described cushion cylinder and piston operating as
herein set forth for the purpose specified.
Second. The combination of cylinder B, piston C, air cocks g, valvo D,
jacket E, and steam passages and ports i, j, k, M, O, and P, constructed
and operating together substantially as described.
In witness whereof, I, the said George Haseltine, have hereunto
set my hand and seal, this Third day of March, in the year of 1
our Lord One thousand eight hundred and seventy-four.
Witness,
JAMES EDWARDS,
S, Southampton Buildings,
London.
GEORGE HASELTINE. (L.s.)