Improvements in Compound Pumping Engines.
Year: 1890

page_text: Date of Application, 24th Mar., 1890
Complete Specification Left, 23rd June, 1890-Accepted, 16th Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in Compound Pumping Engines.
We TANGYES LIMITED of Cornwall Works Soho in the County of Stafford Engineers
and JOHN NICHOLAS FLOYD of Cornwall Cottage Murdock Road Handsworth in the
County of Stafford Mechanical Engineer and DAVID HOME MORTON of No. 52
Holyhead Road Handsworth aforesaid Mechanical Engineer do hereby declare the
nature of this invention to be as follows:-
The said invention relates to direct acting compound steam pumps of the type known
in commerce as the "Special" compound pumping engines that is pumping engines in
which a high pressure steam cylinder and one or more low pressure steam cylinders is
or are arranged in line or side by side and the said invention consists of the improve-
ments hereinafter described in actuating and controlling the slide valves of the low
pressure steam cylinder or cylinders of the said pumps or pumping engines.
The high pressure steam cylinder and its appliances are of the ordinary construction
its steam piston valves actuating its own slide valve by means of tappets as usual. The
slide valve of the low pressure cylinder is operated by a piston working in a small
auxiliary steam cylinder at one end (or at each end) of and preferably in line with
piston valves in the steam chest of the said low pressure cylinder. The ends of the
said small auxiliary steam cylinder are connected by means of pipes to the respective
steam ports or ends of the high pressure steam cylinder. The slide valve in the steam
chest of the low pressure steam cylinder may be of the D or other type and the said
slide valve is fitted with piston valves the pistons of which work in short cylinders at
opposite ends of the steain chest.
The said piston valves carrying the slide valve of the low pressure cylinder are
operated by the piston working in the auxiliary steam cylinder in connection with the
high pressure cylinder by means of the aforesaid pipes. We use the piston valve in
the steam chest of the low pressure cylinder for controlling the motion of the said
auxiliary piston in the following manner. Each end of the steam chest where the
piston of the slide valve works is provided with an auxiliary port which auxiliary
ports connect the ends of the steam chest in which the slide valve pistons work with
the interior of the steam chest in which the slide valve works. The auxiliary poris
described are capable of being opened and closed and regulated by means of screwed
plugs or valves.
By means of the said auxiliary ports in the steam chest the space between the back
of each of the piston valves of the slide valve and the end of the steam chest in which
it works is charged with steam and when the auxiliary piston is moved by the steam
entering its cylinder by the pipes in connection with the high pressure cylinder the
steam is compressed in one or other of the spaces at the ends of the low pressure
steam chest so as thereby to cushion the slide valve piston and retard the motion of
the auxiliary piston. By these means the main pistons in the high and low pressure
cylinders make a pause at the end of their stroke thereby permitting the pump valves
to seat themselves quietly on their seats.
We do not limit ourselves to this arrangement for controlling or retarding the action
of the auxiliary piston as in place thereof an oil, water or air cylinder may be used
the piston of the last named cylinder being connected with the slide valves the dis-
placement of the oil water or air in the said cylinder by the motion of the piston
effecting the retardation of the slide valve as hereinbefore described.
Or the retardation of the motion of the low pressure slide valve may be effected by
regulating the supply of steam to the auxiliary cylinder by placing stop valves in the
pipes by which the said auxiliary cylinder is connected with the steam ports or ends of
the high pressure steam cylinder.

page_text: In a compound pump or pumping engine with more than two cylinders the low
pressure cylinder aforesaid would become an intermediate cylinder and the slide valve
of the third cylinder would be connected with the ports or ends of the intermediate
cylinder and operated exactly as described with respect to the low pressure cylinder
of a two cylinder compound pumping engine.
In the same manner the invention may be applied to a fourth cylinder if desired.
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Compound Pumping Engines.
We, TANGYES LIMITED, of Cornwall Works, Soho, in the County of Stafford,
Engineers, and JOHN NICHOLAS FLOYD, of Cornwall Cottage, Murdock Road,
Handsworth, in the County of Stafford, Mechanical Engineer, and DAVID HOME
MORTON, of No. 52 Holyhead Road, Handsworth aforesaid, Mechanical Engineer, 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 said Invention relates to compound pumping engines in which a high pressure
cylinder and a low pressure cylinder or two or more low pressure cylinders are used
and the said Invention consists of the improvements hereinafter described in actuating
and controlling the slide valves of the low pressure cylinder or cylinders of the said
pumping engines by means of motive fluid from the high pressure cylinder.
The Invention may be used with engines operated by either steam or air but for
simplicity of description we will describe it as applied to a steam pumping engine
from which its application to engines operated by air will also be understood.
The high pressure steam cylinder and its appliances may be of any ordinary con-
struction suited for the application of this Invention, such for instance as that used
in the pump known as "Tangyes Special Pump" and we will describe with reference
to the accompanying drawing (which is a longitudinal vertical section) the application
of the invention to a pump of that kind from which its application to pumps of other
descriptions will also be understood. A is the high pressure cylinder and B is the low
pressure cylinder. The slide valve C of the low pressure cylinder B is operated by a
piston 1 working in an auxiliary steam cylinder È preferably in line with the valve C
of the said low pressure cylinder B which may receive its steam from the high pressure
cylinder in the usual or any convenient way.
The ends of the said auxiliary steam cylinder E are connected by means of pipes F
and G or equivalent steam ways to the steam ports or ends of the high pressure steam
cylinder A as shewn. The slide valve C in the steam chest of the low pressure
steam cylinder B may be of the D or other type and the said slide valve is fitted with
piston valves
Hthe pistons of which work in short cylinders J J at opposite ends
of the steam chest and the piston D is connected to one of the said piston valves H by
the rod d.
In the arrangement illustrated we use the piston valves H H in the steam chest of
the low pressure cylinder B for controlling the motion of the piston D of the auxiliary
cylinder E in the following manner.
Each end of the steam chest where the pistons H H of the slide valve C work
is provided with an auxiliary port K which auxiliary ports connect the ends of the
steam chest JJ in which the slide valve pistons H H work with the interior of the
steam chest in which the slide valve works. The auxiliary ports K K described
may be capable of being opened and closed and regulated by means of screwed plugs
or valves L L.
By means of the said auxiliary ports K K in the steam chest the space between
the back of each of the piston valves H H of the slide valve C and the end of the
steam chest J J in which it works is charged with steam and when the piston L of

page_text: the auxiliary cylinder E is moved by the steam entering its cylinder by the
pipes F G or steam ways in connection with the high pressure cylinder A the steam
is compressed in one or other of the spaces J J at the ends of the low pressure
steam chest so as thereby to cushion the slide valve piston and retard the motion of
the auxiliary piston D.
By these means the main pistons in the high and low pressure cylinders A and B
are caused to make a pause at the ends of their strokes thereby permitting the pump
valves to seat themselves quietly on their seats.
We do not limit ourselves to this arrangement for controlling or retarding the
action of the auxiliary piston D as in place thereof an oil, water or air cylinder may
be used the displacement of the oil water or air in the said cylinder by the motion
of the piston effecting the retardation of the slide valve Ccs hereinbefore
described.
Or the retardation of the motion of the low pressure slide valve C may be effected
by regulating the supply of steam to the auxiliary cylinder by placing stop valves M M
in the pipes F G by which the said auxiliary cylinder E is connected with the steam
ports or ends of the high pressure steam cylinder.
In a compound pump or pumping engine with more than two cylinders the low
pressure cylinder aforesaid would become an intermediate cylinder having its valve
actuated by steam as described and the slide valve of the third cylinder would be
connected with the ports or ends of the intermediate cylinder and be operated by
steam as described with respect to the low pressure cylinder of a two cylinder
compound pumping engine.
In the same manner the invention may be applied to a fourth cylinder if desired.
We wish it to be understood that we do not limit ourselves to the precise details
hereinbefore described with reference to the accompanying drawings as they may be
varied without departing from the nature of this invention.
Having now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed we declare that what we
claim is:-
1. In compound pumping engines actuating the slide valve of the low pressure
cylinder or of the intermediate cylinder or cylinders and low pressure cylinder by
means of motive fluid derived from the preceding cylinder or cylinders substantially
as hereinbefore described.
2. In compound pumping engines the combination of motive fluid pipes or passages
leading from the higher pressure cylinder or its ports to an auxiliary cylinder
containing a piston connected with the piston valve of the slide valve controlling
the supply of motive fluid to the lower pressure cylinder substantially as hereinbefore
described.
3. In compound pumping engines motive fluid pipes or passages leading from the
higher pressure cylinder or its ports into the ends of an auxiliary cylinder containing
a piston connected with piston valves in connection with the valve of the lower
pressure cylinder the chambers (J) in which the piston valves work being connected
with the motive fluid space by passages K or being cushioned by oil or other fluid all
substantially as and for the purposes hereinbefore described.
4. The arrangement and combination of parts constituting the compound pumping
engine as hereinbefore described and illustrated in the accompanying drawing.
Dated this 10th Ly of June 1890
TANGYES LIMITED.
W. J. Parkins,
Secretary.
JOHN NICHOLAS FLOYD.
DAVID HOME MORTON.