AN IMPROVED DIMINISHING VALVE, CAPABLE OF BEING USED ALSO AS A STOP VALVE
Year: 1884

page_text: I JOHN LONGTON Mechanic of Brinscall near Chorley in the County of
Lancaster do hereby declare the nature of my invention for "AN IMPROVED
DIMINISHING VALVE, CAPABLE OF BEING USED ALSO AS A STOP VALVE," to bo as
follows:-
The principal object of this invention is to construct a simple and efficient
diminishing valve for reducing the pressure of steam to any required degree by
means of a dead weight; and by a simple addition thereto this improved
diminishing valve may be used also as a stop valve, to cut off the supply of
steam altogether.
Cast in one piece with the body of the valve is an internal vertical cylindrical
chamber, one side of which is in communication with the inlet opening.
This cylindrical chamber is concentric with the vertical spindle of the valve and.
its ends at the top and bottom are open and communicate by the passages with the
outlet opening.
In the open ends are provided seatings aud against the latter work two disc
valves fixed on the spindle and closing upwards as the spindle rises, so that the
steam from the inlet entering into the cylindrical chamber passes upwards and.
downwards through the valves and along the passages to the outlet, but the steam
entering between the two discs has no tendency to close the valve.
The upper part of the spindle which passes out through an elastic packing ring
is made with an enlargement, and above this rest the movable weights.
So long as the steam remains at the normal pressure the weight on the spindle
keeps the valves open, but should the pressure of the steam increase beyond the
required degree the increased pressure against the lower side of the enlargement on
the spindle raises the weight and closes the valves until the pressure has been
reduced to the required degree, when the weight will again open the valves.
If this valve is required to act as a stop valve as well as a diminishing valve
I fit the bottom of the valve body with a gland through which passes a screwed
spindle working in a nut. The lower end of this screwed spindle is provided with
a small hand wheel or other means of turning the same; and by screwing this
spindle up against the lower valve it will raise both discs against their seatings
and thus act as a stop valve.

page_text: COMPLETE SPECIFICATION.
"
the County of
AN IMPROVED
and in
I JOHN LONGTON Mechanic of Brinscall near Chorley in
Lancaster do hereby declare the nature of my invention for
DIMINISHING VALVE, CAPABLE OF BEING USED ALSO AS A STOP VALVE
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:
The principal object of this invention is to construct a simple and efficient
diminishing valve for reducing the pressure of steam to any required degree by
means of a dead weight, and by a simple addition thereto; this improved
diminishing valve may be used also as a stop valve to cut off the supply of steam
altogether.
Such being the nature and object of my said Invention I will now proceed to
describe in detail the manner in which the same is to or may be performed or
carried into practical effect and in order that the same may be clearly understood
I have annexed hereunto a sectional drawing illustrative thereof and have marked
the same with letters of reference corresponding with those in the following
explanation thereof.
Cast in one piece with the body a, a of the valve is an internal vertical cylindrical
chamber b, b one side of which is in communication with the inlet opening c, c.
This cylindridal chamber b, b is concentric with the vertical spindle d, d of the
valve and its ends at top and bottom are open and communicate by two passages e, e
with the outlet opening f, f.
In the open ends are provided seatings and against the latter work two disc
valves g, g fixed on the spindle d, d and closing upwards as the spindle rises, so
that the steam from the inlet c c entering into the cylindrical chamber b, b passes
upwards and downwards through the valves gg and along the passages e, e to
the outlet ff but the steam entering between the two discs g, g has no tendency
to close the valve.
The upper part of the spindle which passes out through an elastic or other
packing ringk, k is made with an enlargement i, i and above this rest the
inovable weights k, k.
So long as the steam remains at the normal pressure the weights k, k on the
spindle keeps the valve g, g open but should the pressure of the steam increase
beyond the required degree the increased pressure against the lower side of the
enlargement i, i on the spindle d, d raises the weight k, k and closes the valves g, g
until the pressure has been reduced to the required degree, when the weight will
again open the valves.
If this valve is required to act as a stop valve
I fit the bottom of the valve body with a gland l,
spindle m, m working in a nut n, n.
as well as a diminishing valve
through which passes a screwed
The lower end of this screwed spindle m, m is provided with a small hand
wheel o, o or other means of turning the same; and by screwing this spindle up
against the lower valve it will raise both discs g, g against their seatings and thus
act as a stop valve.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be or performed I declare that what
I claim is the improved dead-weight diminishing valve, applicable also as a stop
valve constructed substantially as hereinbefore described and illustrated by the
5 drawings annexed.
Dated this 11th day of December 1981