Improvements in Valves for Controlling and Utilising Surplus Steam of Comparatively High Pressure.
Year: 1892

page_text: Date of Application, 13th Dec., 1892
Complete Specification Left, 8th Sept., 1893-Accepted, 14th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Valves for Controlling and Utilising Surplus
Steam of Comparatively High Pressure.
We, GEORGE COCKBURN, and ALLAN WATSON BAIRD, of Sussex Street,
Kinning Park, in the County of Renfrew, North Britain, Engineers, do hereby
declare the nature of this invention to be as follows, that is to say :-
Our said invention has for its object to provide improved valves for use in cases
in which, in the same works, steam of comparatively high pressure is generated
and used as such whilst there is also apparatus in which steam of comparatively
low pressure is employed.
In carrying out our invention the high-pressure boiler is connected through
a valve box with the low-pressure apparatus; and in the valve box there is
arranged a valve controlled by an external spring which is adjustable, the valve
opening and allowing surplus steam to pass to the low-pressure apparatus, when
the boiler pressure exceeds the pressure for which the spring is adjusted. The
valve spindle is fixed to a flexible diaphragm which is of the improved compound
kind described in our Patent Specification No. 6447 of 1886.
Dad thich J. of Dember 1800
EDMUND HUNT,
Applicants' Agent.
.
COMPLETE SPECIFICATION.
Improvements in Valves for Controlling and Utilising Surplus
Steam of Comparatively High Pressure.
We, GEORGE COCKBURN, and ALLAN WATSON BAIRD, of Sussex Street,
Kinning Park, in the County of Renfrew, North Britain, 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, that is to say :-
Our said invention has for its object to provide improved valves for use in cases
in which, in the same works, steam of comparatively high pressure is generated
and used as such whilst there is also apparatus in which steam of comparatively
low pressure is employed.
In carrying out our invention the high-pressure boiler is connected through a
valve box with the low pressure apparatus; and in the valve box there is arranged
a valve controlled by an external spring which is adjustable, the valve opening and
allowing surplus steam to pass to the low-pressure apparatus when the boiler
pressure exceeds the pressure for which the spring is adjusted. The valve spindle
is fixed to a flexible diaphragm which is of the improved compound kind described
in our Patent Specification No. 6447 of 1886.
And in order that our said invention and the manner of performing the same
may be properly understood we hereunto append a sheet of explanatory drawings
to be hereinafter referred to and showing our improved valve.
Figure, 1, of the drawings is a vertical section of our improved valve and
Figure, 2, is a sectional plan, as with the valve-box cover removed.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the valve box, A, which connects the high-pressure boiler with the low-
pressure apparatus there is arranged a valve, B, of an ordinary form and closes

page_text: down against a seat, C, fixed in an opening in an inner part of the casting which
separates the inlet, D, from the outlet, E. The amount of opening of the valve, B,
is limited by its contact with the lower end of a spindle, F, which extends up
through a central guide eye in the valve box cover, G, and has a helical spring, H,
applied to its outer end. This spring, H, is held down and adjusted by a screw
pin, J, bearing on its upper end and screwed through a top plate, K, tied to the
cover, G, by rods, L. The valve, B, opens and allows surplus steam to pass to
the low-pressure apparatus when the boiler pressure exceeds the pressure for which
the spring, H, is adjusted. The valve spindle, F, is fixed to a flexible diaphragm, M,
which is of the improved compound kind described in our Patent Specification
No. 6447 of 1886, being made of copper or other suitable metal and with
corrugations, its outer edge being fixed in the joint between the cover, G, and the
body of the valve box, A, whilst its inner edge is held between a collar, N,
formed on the valve spindle, I, and a ring, P, which is fixed by a nut, Q. screwed
on the spindle. The ring, P, is formed with a groove or rebate round it and a
similar groove or rebate is formed round the inner edge of the cover, G, and
between these two grooves there are placed a series of metal segments, R, which
lie upon the diaphragm, M, and which are fitted into the grooves and in contact
with each other with just sufficient looseness to allow of their inner ends moving
freely up and down with the valve spindle, F. These segments, R, strengthen
the diaphragm, M, and equalise its action without diminishing its flexibility.
Projections, S, are formed on the top of the valve box, A, to keep the diaphragm, M,
in its place.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
The combination, arrangement, and construction of parts forming our improved
valve for controlling and utilising surplus steam of comparatively high pressure
substantially as hereinbefore described and as shown in the accompanying
drawings.
Dated this Seventh day of September 1893.
EDMUND HUNT,
Applicants' Agent.