IMPROVEMENTS IN THE CONSTRUCTION OF TAPS FOR STEAM OR HOT FLUIDS
Year: 1876

page_text: LETTERS PATENT to John Edward Dooley, of Stockport, in the County of
Chester, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF TAPS
FOR STEAM OR HOT FLUIDS."
Sealed the 4th August 1876, and dated the 9th February 1876.
PROVISIONAL SPECIFICATION left by the said John Edward Dooley at the
Office of the Commissioners of Patents on the 9th February 1876.
JOHN EDWARD DOOLEY, of Stockport, in the County of Chester. "IMPROVE-
MENTS IN THE CONSTRUCTION OF TAPS FOR STEAM OR HOT FLUIDS."
This Invention applies to conical plug taps, and the object of my Invention is to
prevent the unequal expansion and contraction which takes place in steam taps of
the ordinary construction when the tap is closed and the steam is in communication
with one side only of the plug.
The Invention consists principally in making a hollow steam chamber all round
the body of the tap, which chamber is in communication with the steam side of the
plug so that the latter is at all times equally heated all round whether the tap is
turned on or off, and thus unequal expansion and contraction is avoided.
The plug is hollow with an opening in the side and in the bottom, and does not
reach quite to the bottom of the tap, so that when the tap is opened the steam can
pass through the bottom of the hollow plug into a chamber and thence up a
passage to the pipe.
In taps of large size I propose to cast the body of the tap in iron and insert a
lining of brass which at the same time forms the inner wall of the steam chamber
and the conical bed for the plug.
0 SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said John Edward Dooley in the Great Seal Patent Office on the 8th August
1876.
JOHN EDWARD DOOLEY, of Stockport, in the County of Chester. "IMPROVE-
MENTS IN THE CONSTRUCTION OF TAPS FOR STEAM AND HOT FLUID."

page_text: This Invention relates to conical plug taps, and the object of the improvements
is to prevent the unequal expansion and contraction which takes place in steam
taps of the ordinary construction when the tap is closed and the steam is in
communication with one side only of the plug.
The Invention consists principally in making a hollow steam chamber all round
the body of the tap, extending nearly the full length of tho barrel, such chamber
being in communication with the steam side of the plug so that the latter is at all
times equally heated all round whether the tap is turned on or off, and thus unequal
expansion and contraction is avoided.
The plug is hollow with an opening in the side and in the bottom, and does not
reach quite to the bottom of the tap, so that when the tap is opened the steam can
pass through the hollow plug into a chamber and thence up a passage to the pipe.
In taps of large size I propose to cast the body of the tap in iron and insert a
lining of brass, which at the same time may form the inner wall of the steam
chamber and the conical bed of the plug.
The accompanying Drawing will serve as illustrating a convenient mode of
performing my said improvements.
Fig. 1 is a sectional plan, and Fig. 2 a sectional elevation of a steam tap con-
structed according to my Invention.
C is a hollow steam chamber surrounding the hollow plug E. In both Figures
the tap is shown open. F is steam chamber at bottom of plug; F', steam passage
way; D is the inner wall of the hollow chamber C.
I do not however confine myself to the way illustrated, as it is obvious that the
Invention may be performed in several ways without departing from the nature of
my Invention, but the mode shown is the best I am at present acquainted with.
In witness whereof, I, the said John Edward Dooley, have hereunto set my
hand and seal, this Fourth day of August, in the year of our Lord One
thousand eight hundred and seventy-six.
JOHN EDWARD DOOLEY
JOHN EDWARD DOOLEY.
(i.s.)