IMPROVEMENTS IN THE CONSTRUCTION OF VALVES
Year: 1882

page_text: PROVISIONAL SPECIFICATION left by the said James Baldwin at the
Office of the Commissioners of Patents on the 26th April 1882.
JAMES BALDWIN, of Keighley in the County of York, Engineer IMPROVEMENTS
IN THE CONSTRUCTION OF VALVES
The object of my invention is to construct valves in such a manner that the
valve seating and cover can be removed from the valve casing and new ones
replaced whilst the pressure is in the pipe communicating with the underside of
the valve.
This I accomplish by forming the bottom part of the interior of the valve casing
conical, having an opening on one side of same communicating with the pipe
supplying the liquid or steam which is to pass through the valve. This conical
part is fitted with a hollow plug having an opening in the side corresponding with
the one before mentioned this plug is free to revolve and is secured to the casing
by means of a nut.
Immediately above the before mentioned plug is fitted the valve seating the
cover of which is screwed down by means of a hand wheel and spindle mounted in
the same manner as when fitted to ordinary combined check and stop valves.
When the valve seating requires to be replaced the plug is turned such a distance
that the opening in the side thereof is closed, and the spindle and upper portion of
the valve removed: the nut securing the plug in position is then unscrewed and
the bottom part of the plug struck upwards thereby raising the seating which is
then free and which can be withdrawn and replaced with a new one.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Baldwin in the Great Seal Patent Office on the 25th October
1882.
JAMES BALDWIN of Keighley in the County of York, Engineer, IMPROVEMENTS
IN THE CONSTRUCTION OF VALVES.
The object of my invention is to construct valves in such a manner, that the
valve seating and cover can be removed from the valve casing and new ones
replaced whilst the pressure is in the pipe communicating with the valve; and
consists in placing a hollow plug with an opening in it, in the bottom part of the
valve casing; a corresponding opening being made in the casing of the valve.
Directly above the plug is the valve seating and cover, the latter being screwed
down in the ordinary manner. When the seating requires replacing the plug is
turned so as to close-the-opening-in-the-casing; the nut securing the plug is
loosened and by gently striking the plug upwards the scating is raised, the plug is
then secured by the nut and on the removal of the top part of the casing the valve
seating can be taken out.
Such being the nature and object of this my invention, I will proceed to describe
_the same in detail, and in order that it may be clearly understood I have hereunto
annexed a drawing and have marked the same with-letters-of reference...
The accompanying drawing represents a part section of one of my improved
combined check and stop valves; the conical part of the casing is indicated by the
letter A, the opening-B-communicating with the steam or water pipe. The hollow
plug C is fitted into the before mentioned conical part of the casing A-and-the-
opening D in the plug C corresponds with the opening B in the casing.
The nut and washer marked respectively E and F secure the plug in the casing;
the valve seating G is made slightly conical and is "ground" into the casing
making a steam-tight joint without the use of a screw-thread, white lead or cement.
The cover H is screwed down by means of a hand wheel J and spindle K which
are fitted in the usual manner.
When it is necessary to replace the valve seating G the hollow plug C is turned
that the opening B is closed. The nut E securing the plug is then unscrewed and
on the bottom of the plug being struck upwards, the seating G is raised and can
be withdrawn; when the nut E is tightened and the cover H removed from the
top of the valve casing.
Having now described my Invention and the manner in which the same may be
carried into effect, I would have it understood that what I claim as my Invention
is: The construction of valves in which the cover and valve seating can be
removed from the casing when the pressure of steam or water is in the pipes
connected with the valve, all arranged substantially in the manner as described
and as illustrated by the accompanying drawing.
In witness whereof I the said James Baldwin have hereunto set my hand
and seal this 23rd day of October in the year of our Lord One thousand
eight hundred and eighty two.