An Improvement in Slide Valves in Steam Engines.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
An Improvement in Slide Valves in Steam Engines.
RICHARD STEPHENSON 37 Richmond Grove Longsight Manchester, Secretary,
and FRANK CHORLTON, 24 Corporation Street, Manchester, Chemist, do hereby
declare the nature of this invention to be as follows:-
This invention is a piston valve and cylinder, cone, liner, divided discs, spring &
spindle.
This cone is bored to fit the spindle inside, outside the divided discs, which when
in opposition are the diameter of the cylinder. A suitable spring at the base of
the cone keeps up pressure of the cone against the discs. Between the discs is a
liner, and on the spindle two distance pieces are fastened to prevent the discs from
moving out of position. The discs slide backward & forward over the port in the
usual way and as they are kept distended by the action of the spring pressing the
cone to distend them are kept steam tight whilst steam is prevented from blowing
through the cone by a packing ring or stuffing box.
Dated this First day of July 1895.
RICHD. STEPHENSON.
FRANK CHORLTON.
An Improvement in Slide Valves in Steam Engines.
We, RICHARD STEPHENSON, of 37 Richmond Grove, Longsight, Manchester,
in the County of Lancaster, Secretary, and FRANK CHORLTON, of 24 Corporation
Street, Manchester aforesaid, Chemist, 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:-
Our invention relates to an improvement in slide valves applicable to marine,
locomotive, stationary, portable and other steam motors.
The improved slide valve is a piston valve constructed and arranged substantially
as hereinafter described with reference to the accompanying drawing which is a
longitudinal section of the improved valve and its casing.
In this view, a designates the valve cylinder or casing, a¹ the steam inlet,
a the port or passage admitting steam to the cylinder, and as the exhaust;
b the cover, c the stuffing box and d the valve spindle. On the spindle d are fixed
two distance pieces e and fand between them are fitted a cone g and two divided
discs and an intermediate washer or liner j.
The distance piece e is shown fixed by means of a stud e¹ on the spindle & and
the piece by means of a screw thread and nut f¹ to admit of adjustment; but
any other suitable mode of securing the pieces in position may be employed.
The cone
is fitted to slide upon the spindle d and at its outer larger end is
fitted with a stuffing box k so arranged as to maintain a steam tight joint whilst
allowing the cone to slide freely on the spindle.
The discs hi have their peripheries turned to fit the interior of the valve
casing a and are bored internally to accurately fit the cone g and they are split or
1027

page_text: divided into any convenient number of segments, capable of being expanded by
the cone g.
Between the discs hi is placed the thin metallic or other washer j of the same
diameter as the discs and bored out to fit the cone g.
A coiled spring or any other suitable form of spring is compressed between the
distance piece f and the disc i and similarly coiled or other springs are compressed
between the distance piece e and the parts g and h, the spring m. bearing on the
cone 9 and the spring n on the disc h.
The pressure of the springs serves two purposes namely to act on the sliding
coney and thereby expand the segments of the discs h and i against the inside of
the casing a so as to make with the washerja steam tight joint, and also to press
against the side face of the disc and so balance the pressure of steam admitted
through the inlet a' against the side face of the disc i.
Between the front distance piece and the face of the disc i a space of about
one-sixteenth of an inch is left so that when steam is shut off the spring n
overcomes the resistance of the spring and moves the disc against the distance
piece whereby all wear is taken off the valve; but when steam is again admitted
the pressure against the side face of the disc i forces the discs back up the cone g
and keeps them in contact with the inside of the casing a.
We wish it to be clearly understood that we do not limit ourselves to the exact
details berein shown and described as the same may be varied or modified without
departing from the nature of our invention. For example, we may employ more
than two discs, and other forms of springs and distance pieces and the washer j
may be dispensed with.
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 :-
1. The combination with the divided discs and sliding cone provided with a
stuffing box, of the distance pieces and springs substantially as and for the purposes
herein set forth.
2. The general arrangement and combination of parts embodying our improve-
ment in slide valves substantially as herein described and as illustrated by the
accompanying drawing.
Dated this 1st day of April 1896.
H. B. BARLOW & GILLETT,
17 St. Ann's Square, Manchester, Agents for Applicants.