Improvements in Combined Stop and Reducing Valves.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Combined Stop and Reducing Valves.
I, JOHN LONGTON, Mechanic, of New Ground, Brinscall, near Chorley, Lan-
cashire, do hereby declare the nature of this invention to be as follows:-
The alteration of reducing valve as now made by me.
The amendment being in part termed the shutter the valve spindle being of a
much larger diameter than before thus checking the travel of reduced steam up
into the aperture thereby effecting a more constant pressure on the reduced side.
My invention is to further take the combined stop & reducing valve made now
by me & make slight alterations in the part termed the shutter. My intention is
to make the valve spindle of a much larger diameter at the top so as to be a
sliding fit in steam aperture, the object of this being to keep the reduced steam
at a more constant pressure which now owing to the gathering of steam in said
aperture varies according to pressure accumulated.
.
I, JOHN LONGTON, Mechanic, of New Ground, Brinscall, near Chorley, in the
County of Lancaster 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:-
The principal object of this invention is to construct a simple and efficient valve
for reducing the pressure of steam to any required degree and by a simple addition
thereto to retain the said pressure.
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 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 cylindrical 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.

page_text: In the open ends are provided seatings and against the latter work two disc
valves g, g, cast 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 past the valves g, g, and along the passages e, e, to the
outlet f, but the steam entering between the two disc's g, g, has no tendency
to close the valve.
The upper part of the spindle d, d, which passes out through the top of valve h, h,
is cast with a piston or plunger i, i, which is extended down to top of disc 9, 9,
thereby dispensing with wings (on top of g g) as heretofore used, the object being
to give a more constant steam pressure on the reducing side of valve.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:-
In steam reducing valves:-the extension downwards of the piston or plunger
too top side of disc valves g, g, as hereinbefore described.
Dated this 18th day of February 1898.
JOHN LONGTON.
Applicant.