Improvements in connection with Pumping Engines and Air Compressors.
Year: 1894

page_text: Date of Application, 10th Oct., 1894
Complete Specification Left. 10th July, 1895-4ccepted. 14th Sent
1305
Date of Application, 10th Oct., 1894
Complete Specification Left. 10th July. 1895-4ccepted 14th Sent
1305
PROVISIONAL SPECIFICATION.
Improvements in connection with Pumping Engines and Air
Compressors.
I JOHN DOBSON WARDALE of Redheugh Engine Works Gateshead-on-Tyne
in the County of Durham Engineer do hereby declare the nature of this invention
to be as follows:-
My invention relates more particularly to direct acting duplex pumping engines
but is also applicable to air-compressors and consists in the application to the pump
cylinder in place of mushroom or similarly constructed valves depending upon a
vacuum caused by the piston or plunger for their working, of valves constructed
similarly to ordinary D slides or as piston valves and worked automatically by
levers from the steam piston rods or other suitable moving part of the steam engine
for the admission and delivery of liquids to and from the pump cylinder.
According to my invention the suction and delivery ports or passages to and
from the pumping cylinder are opened and closed by means of a slide valve the
inner port of which opens to the suction passages, the outer port thereof opening to
the delivery passages. This slide valve can be worked by the lever which operates
the slide valve of the steam cylinder. By crossing the ports of the steam cylinder
so that they open to the valve chest thereof at the ends opposite to those at which
they communicate with the pump cylinder the same lever that works the slide
valve for the steam cylinder can be made to open the slide valve of the pump
cylinder. The valve of one engine may receive motion from any suitable moving
part of the other engine.
The valves of the steam cylinder or of the pump cylinder may be either slide
valves or piston valves and the ports of the pump cylinder may be crossed instead
of those of the steam cylinder as hereinbefore described but I prefer to cross the
ports or passages of the steam cylinder and have the ports or passages to and from
the pump cylinder as short as possible.
Dated this 10th day of October 1894.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in connection with Pumping Engines and Air
Compressors.
'
I, JOHN DOBSON WARDALE of Redheugh Engine Works, Gateshead-on-Tyne,
in the County of Durham, 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:-
My invention relates more particularly to direct acting duplex pumping engines
but is also applicable to air-compressors and consists in the application to the pump
cylinders in place of mushroom or similarly constructed valves depending upon a
vacuum caused by the piston or plunger for their working, of valves constructed
Di, 1

page_text: similarly.to ordinary D slides or piston valves and worked automatically by levers
from the steam pistob rods' or other suitable moving parts of the steam engine, for
the admission and delivery of fluids to and from the pump cylinders.
According to my invention the suction and delivery ports or passages to and
from the pumping cylinder are opened and closed by means of a slide valve the
inner port or cavity of which valve cominunicates with the suction passage in the
port face of the cylinder the delivery ports in the said port face being each caused
by the movement of the valve to communicate with the suction passages and with
the valve chest alternately to which valve chest the delivery pipes are attached.
By crossing the ports of the steam cylinder so that they open to the valve chest
thereof at the ends opposite to those at which the ports of the pump cylinder open
to the valve chest of the said pump cylinder the same lever that works the slide
valve for the steam cylinder can be made to operate the slide valve of the pump
cylinder. The valve of one engine may receive motion from any suitable moving
part of the other engine.
In order that my invention may be clearly understood I will further describe the
same with reference to the accompanying drawings as applied to a duplex pumping
engine for liquids from which its application to air compressors will be clearly
understood.
Figure 1 represents a longitudinal vertical section of a duplex pumping engine
constructed according to my invention.
Figure 2 is a transverse section taken along the line 1-2; Figure 1, through the
pump cylinders.
Figures 3 and 4 are transverse sections through the steam cylinders taken along
the lines 3-4 and 5-6 respectively and
Figure 5 is a section taken along the line 7-8, Figure 4, through the ports of
the steam cylinder.
A A are the pump cylinders surrounded by a chamber B in connection with the
suction pipes and communicating with the port or passage C situated in the port
face of the cylinder between the ports or passages D which connect the opposite
ends of the cylinder A with the delivery or valve chamber E. Each pump
cylinder according to my invention is provided with a slide valve F for governing
the passage of liquid through the ports C and D which valve as shewn in the
drawing is similar in construction to an ordinary D slide valve. Through the
centre cavity a of this valve the liquid from the chamber B passes to one or other
end of the cylinder A by one or other of the ports D according to the position of
the valve, the liquid contained in the cylinder being forced therefrom,, by the
movement of the piston G, into the valve chest E through the port D which is not
at the time covered by the valve, the pressure of the liquid in the said valve chest
by acting on the back of the valve, maintaining the said valve in contact with the
port face bard if necessary or desired any excess of pressure on the back of the
valve F may be counteracted by providing a counter pressure slide to work with
the valve. The valves F of the two pump cylinders may be operated by any
suitable moving part of the engine. I have shewn them as being operated by
means of levers H from the piston rods I, the levers being coupled at c to links d
connecting the spindles of the valves F to the spindles of the valves K in the
steam chest of the steam cylinders L. The pistons M in the cylinders L are
carried on the same rods I which carry the pistons G of the pump cylinders. The
lever H for working the valves of one engine is operated from the piston rod or
other suitable moving part of the other engine.
The ports of each of the steam cylinders cross one another as shewn in Figures 1
to , so that the steam is caused to pass from the steam chest E' into the steam
cylinders L at the ends, the reverse to those through which the fluid is caused to
pass from the pump cylinders A into the valve chest E, thereby admitting of the
slide valves of the steam cylinder and the pump. cylinder, being operated by the
same lever H. In these figures the steam admission ports are marked 1 and 2
the exhaust ports are marked 3 and 4 and the main exhaust passage is marked 5.

page_text: The steam inlet ports 1 connect the right hand end of the steam chests with the
left hand end of the cylinder and the ports 2 connect the left hand end of the steam
chest with the right hand ends of the steam cylinders. In like manner the exhaust
ports 3 connect the left hand end of the cylinders with the right hand end of the
steam chest and the exhaust ports 4 connect the' right hand end of the cylinders
with the left hand end of the steam chest. Instead of ☐ slide valves as shewn and
described, piston-valves may be employed and instead of crossing the ports of the
steam cylinders they may be made as usual, and the ports of the pump cylinder be
crossed as described, I prefer however to cross the steam ports and to make the
ports or passages to and from the pump cylinder as short as possible.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed I declare that what I
claim is:
1. In duplex pumping engines or air compressors the use of slide valves or piston
valves for governing the admission and delivery of liquid or air (as the case may
be) to and from the pumping cylinder or cylinders substantially as hereinbefore
described.
2. In a duplex pumping engine for fluids the combination of slide valves or
piston valves for governing the admission to and delivery from the pumping
cylinders, of the fluid to be pumped, and the means for operating the valves of
one of the engines from a moving part of the other engine as hereinbefore
described.
3. The combination and arrangement of parts constituting the duplex pumping
engine substantially as hereinbefore described and illustrated by the accompanying
drawing.
Dated this 10th day of July 1895.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.