Improvements in Slide or Distributing Valves and Valve Seats for Steam Engines.
Year: 1887

page_text: Date of Application, 15th July, 1887
Complete Left, 9th Apr., 1888
Complete Accepted, 11th May, 1888
Improvements in Slide or Distributing Valves and Valve Seats for
Steam Engines.
JAMES LANG Engineer 27 St. Vincent Crescent Sandyford Glasgow do hereby
declare the nature of my invention for IMPROVEMENTS IN SLIDE OR DISTRIBUTING
VALVES AND VALVE SEATS FOR STEAM ENGINES to be as follows:-
My invention relates to improvements in slide or distributing valves and valve
seats for cylinders of common; compound; triple; quadruple, or multiple expansion
stean engines, and it consists in making the valve seat or seats separate from and
attached to the cylinder by bolts, studs or screw pins inside of the ordinary valve
casings the valves are of the piston type, and it is proposed to use one, two, three or
more of them in the separate valve seats.
The improved valve seat is a casting with steam and exhaust ports, corresponding
to the steam and exhaust ports of the cylinder, and having the piston valves fitted
into it, when the steam is admitted at the outer ends of the valves, the exhaust is in
the centre, but when the steam is admitted in the centre the exhaust is by the
outer ends.
The valves have spindles extending down, and coupled to a crosshead inside of
valve casing. This crosshead which is by preference made in two halves, is attached to
a central spindle which passes through the ordinary valve casing, or the piston valve
spindles may be made to extend through the valve casing and connected by a similar
crosshead as described above to a central spindle which is moved by the excentrics or
the valve motion.
The valves can be made to suit either the ordinary three port or five port
arrangement.
In cases where an expansion valve is required the separate valve seat is made with a
face at the back of it, and with two ports opening from the back which admits the
steam through the back of the valve seat, to the piston valves, the top and bottom ends
of the piston valves are closed.

page_text: The expansion valve is by preference of the well known Mayer type, having two
plates on a spindle on which right and left hand screws are cut. The one plate being on
the right, and the other on the left hand screw, and by turning the spindle the plates
are drawn closer together or separated further as desired, the valve being moved by
a different excentric from the one which moves the piston valves. But any other of
the well known types of expansion valves can be used in combination with the
improved valve seat and piston valves.

page_text: Improvements in Slide or Distributing Valves and Valve Seats for
Steam Engines.
JAMES LANG Engineer 27 St. Vincent Crescent Sandyford Glasgow 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 :-
My Invention relates to improvements in slide or distributing valves, and valve
seats for Cylinders of common: compound: triple: quadruple or multiple expansion
steam engines, and consists in making the valve seats seperate from and attached to
the cylinder face by bolts, studs, or screw pins inside of the ordinary valve casings,
the valves are of the Piston type and it is proposed to use one, two three, or more of
them in the seperate valve seats.
The Invention is illustrated by the accompanying Drawings in which Figures 1,
and 2, are sections at right angles showing the improved valve seat as applied to an
ordinary three ported valve arrangement. Figures 3, and 4, are sections at right
angles showing the improved valve seat as applied to an ordinary five ported valve
arrangement. Figure 5, shows a horizontal view of the piston valve. Figures 6.
and 7. are sections at right angles showing the improved valve seat as applied to an
ordinary three ported valve arrangement with an expansion valve working on the
back of the valve seat, and which can also be applied to the five ported valve
arrangement.
The same letters or numerals indicate the same parts in each view. In Figures 1,
to 5, a, a, is the ordinary valve casing, b, b, the steam ports in Cylinder face, c, c, the
exhaust ports, d. d. the seperate valve seat attached to the Cylinder face by bolts,
studs, or screw pins, and having steam, and exhaust ports cast in it to suit the
corresponding ports in the cylinder face, and with one, two, or more circular orifices
at right angles to the steam, and exhaust ports, in which the piston valves work, e, e,
the piston valves which may be solid blocks, or have packing rings either with or
without springs, f. f. the crosshead made in halves, connecting the piston valve rods
to the central rod from the excentrics or other motion rod, this crosshead may be
either inside or outside the ordinary valve casing, 1, 1,doors in back of valve seat admitts
to exhaust side of the piston valves.
In Figures 6, and 7, g. g. are the steam inlet, from the ordinary valve casing,
covered by expansion plates, h, h, which can be adjusted or altered by turning the
rod, i. k. k. are pistons on the outer ends of the piston valve rods, working in
continuations of the piston valve orifices, and their use is to close the piston valve
orifices from communication with the steam in the ordinary casing. This closing of
the piston valve orifices can be done by seperate covers bolted on to the ends of the
orifices, the cover for the bottom end having a stuffing box in it where the rod passes
through. The pistons, k, k, may then be dispensed with. 1, l, doors in back of valve
seat admitts to exhaust side of the piston valves.

page_text: Steam is admitted in the usual manner to the ordinary valve casing and the exhaust
steam is taken away in the usual manner to the ordinary valve casing, and the
exhaust steam is taken away in the usual manner so that the improvements are directly
applicable to existing engines.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I have to state that I do
not restrict myself to the precise details herein described, and illustrated but that
what I believe to be, novel and original, and claim as the Invention is :-
First. The improved valve seat seperate, but attached to the cylinder face, with
piston valves, either singly, or in groups of two or more as illustrated, and described
in Figures 1, 2, 3, 4.
Second. The improved valve seat with piston valves, and expansion valves on back
of valve seat, as illustrated and described in Figures 6, and 7.
Third. The combination of seperate valve seat and piston valves with an ordinary
valve casing substantially as herein described and illustrated.
Fourth. The combination of valve seat and piston valves in groupes coupled together
by a crosshead in an ordinary valve casing and worked by an excentric or other motion
rod substantially as described and illustrated.
1
+11000
JAMES LANG,
27, St. Vincent Crescent,
Sandyford, Glasgow,
Engineer.