Improvements in Water Gauges for Steam and other Boilers.
Year: 1890

page_text: Date of Application, 29th Mar., 1890
Complete Specification Left, 24th Dec., 1890-Accepted, 14th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Water Gauges for Steam and other Boilers.
We, JOHN DEWRANCE and GEORGE HENRY WALL, both of 158, Great Dover
Street, Lambeth, in the County of Surrey, Engineers, do hereby declare the
nature of this invention to be as follows:-
This invention has for its object certain improvements in the automatic valves of
water gauges, similar in purpose to those described in the Patent No. 14,952 of 1888
granted to us.
In the top arm of a water gauge we provide an automatic valve by preference a
ball valve to cut off the inconvenient rush of steam that occurs under high pressure.
when the glass breaks.
The ball valve is contained in a chamber hereinafter called the valve box, con-
nected to the screw plug which closes the opening through which the glass is
introduced. The upper part of this valve box fits into a diaphragm formed in the
body of the water gauge, and between the valve box and the end of the screw of
the plug there are suitable openings for the passage of steam to the valve box and
one of these openings we prefer to employ to introduce the ball valve into the
valve box.
The passage for steam from the boiler is above the diaphragm and above the top.
of the valve box. Underneath the diaphragm is a circular cavity larger and
deeper than the valve box communicating with the glass: there is a hole which we
call a large hole in the side of the valve box below the diaphragm for the passage
of steam to the glass. The floor of the valve box is inclined, the ball rests at the
opposite side away from the large hole, so that when in a state of equilibrium there.
is a full & free passage from the boiler to the glass, but when the glass breaks the
ball is driven over & closes the large hole.
In order to give sufficient steam to clean the glass and to give an indication when
the glass breaks and also to restore the equilibrium of pressure, we by preference
make a hole in the valve box or a small by-pass may be made in any other way.
The valve box may be separate from the screw plug and rest upon a seating in the
diaphragm, in this case we provide a suitable handle to take it out by.
The diaphragm which divides the passage into the boiler from the passage to.
the glass may be vertical and fit the valve box at its sides and is supplemented by
such surfaces as are necessary to ensure that the passage may be only through the
valve box. In this case the valve box is arranged to go in only one way and the
inlet is on one side and the outlet to the glass on the opposite side; the valve box
may be in one piece with the cover if bolts are used or it may be connected in any
suitable
way or it may be separate with a handle by which to lift it out.
Dated this 28th day of March 1890.
JOHN DEWRANCE.
GEORGE HENRY WALL.
COMPLETE SPECIFICATION.
Improvements in Water Gauges for Steam and other Boilers.
We, JOHN DEWRANCE and GEORGE HENRY WALL, both of 158, Great Dover
Street, Lambeth, in the County of Surrey, Engineers, do hereby declare the
nature of this invention, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention has for its object certain improvements in the automatic valves of
water-gauges, similar in purpose to those described in the Patent No. 14,952 of 1888.
granted to us.

page_text: "
.
In the top arm of a water-gauge we provide an automatic valve by preference a
ball valve to cut off the inconvenient rush of-steam that occurs under high pressure
when the glass breaks.
The ball valve is contained in a chamber, hereinafter called the valve box, con-
nected to the screw plug which closes the opening through which the glass is
introduced. The upper part of this valve box fits into a diaphragm formed in the
body of the water-gauge, and between the valve box and the end of the screw of
the plug there are suitable openings for the passage of steam to the valve box and
one of these openings we prefer to employ to introduce the ball valve into the
valve box.
The passage for steam from the boiler is above the diaphragm and above the top
of the valve box; underneath the diaphragm is a circular cavity larger and deeper
than the valve box communicating with the glass; there is a hole which we call the
large hole in the side of the valve box below the diaphragm for the passage of
steam to the glass. The floor of the valve box is inclined, the ball rests at the
opposite side away from the large hole, so that when in a state of equilibrium there
is a full and free passage from the boiler to the glass, but when the glass breaks the
ball is driven over and closes the large hole.
In order to give sufficient steam to clean the glass and to give an indication when
the glass breaks, and also to restore the equilibrium of pressure, we by preference
make a second hole in the valve box or a small by-pass may be made in any other
way. The valve box may be separate from the screw plug and rest upon a seating
in the diaphragm, in this case we provide a suitable handle to take it out by.
The diaphragm which divides the passage into the boiler from the passage to the
glass may be vertical and fit the valve box at its sides and is supplemented by such
surfaces as are necessary to insure that the passage may be only through the valve
box in this case the valve box is arranged to go in only one way, and the inlet is
on one side and the outlet to the glass on the opposite side. The valve box may be
in one piece with a cover if bolts are used or it may be connected in any suitable
way or it may be separate with a handle by which to lift it out.
The accompanying drawing illustrates one of the ways of carrying out our inven-
tion in which a is the body of the top arm of a water gauge, the glass tube, e the
usual screw plug by the removal of which the passage into the boiler may be
cleared by a rod, d is the top cap, e is the valve box in which the automatic ball
valve rests, are bars of metal connecting the valve box to the top cap d, and
between which the ball valve is passed into the valve box, h is the large hole or
passage to the glass, k is the diaphragm, 1 is the circular cavity which provides a
passage from the large hole h in whatever position it may be, m is the small hole or
bye-pass; in its working condition the ball valve occupies the position shewn, but
when the glass tube breaks the ball valve is driven up and against the large hole h
and shuts off the rush of steam.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is:-
I. The improved apparatus and arrangements hereinbefore described whereby an
automatic valve is put into and taken out from the top arm of a water-gauge sub-
stantially as described.
Dated this 24th day of December 1890
JOHN DEWRANCE.
GEORGE HENRY WALL.