Improvements in Pumping Engines and other Engines having their Valves Operated by Steam or other Motive Fluid.
Year: 1891

page_text: Date of Application, 17th Feb., 1891
Complete Specification Left, 12th Nov., 1891-Accepted, 12th Dec., 1891
PROVISIONAL SPECIFICATION.
Improvements in Pumping Engines and other Engines having their
Valves Operated by Steam or other Motive Fluid.
I JOHN NICHOLAS FLOYD of Cornwall Cottage, Murdock Road, Handsworth
in the County of Stafford Mechanical Engineer, do hereby declare the nature of
this invention to be as follows:-
My invention relates to engines which have their valves operated by steam or
other motive fluid and has more especial reference to the engines of the pumps
known as Tangye's special pumps. Hitherto the steam or motive fluid, after it has
acted upon the valve is exhausted into the exhaust passage from the cylinder of the
engine.
According to my invention I make, at each end of the valve casing and main
cylinder, passages forming communications between them so that the exhaust steam
or motive fluid after it has operated upon the valve passes or exhausts into the ends
of the main cylinder and acts as a cushion for the piston thereof.
D17 Walmart 1001
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.
COMPLETE SPECIFICATION.
Improvements in Pumping Engines and other Engines having their
Valves Operated by Steam or other Motive Fluid.
I JOHN NICHOLAS FLOYD of Cornwall Cottage Murdock Road Handsworth
in the County of Stafford Mechanical Engineer do hereby declare the nature of
my said 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 engines which have their valves operated by steam or
other motive fluid and has more especial reference to the engines of the pumps
known as Tangye's special pumps. Hitherto the steam or motive fluid from the
valve has been exhausted into the exhaust passage from the main cylinder of the
engine. According to my invention I provide at each end of the valve casing and
main cylinder, passages forming communications between them so that the steam or
motive fluid exhausts from the valve into the ends of the main cylinder and acts as
a cushion for the piston thereof.
Figure 1 of the accompanying drawing shews an arrangement according to my
invention, A is the main cylinder, B the piston thereof, C the valve and c' the
pistons on it working in the cylinders a² of the valve casing a, are the passages
which lead from the cylinders a² to exhaust motive fluid therefrom to cause the
valve to move when the tappets E are operated by the piston B.
The passages at e by which the motive fluid is supplied to and exhausted from
the main cylinder open thereinto at e inward of orifices d which open into the
outmost ends of the cylinder A so that when the tappets E are opened by the
piston B (against the pressure of the springs shewn tending to close them) the
motive fluid exhausted from the valve cylinders a² is caused to enter the main
cylinder when the piston is near the end of its stroke and so constitute a cushion
therefor.
Figure 2 shews diagrammatically the connections of the pipes from the valve
cylinders to the main cylinder ends in a duplex pumping engine to which my
invention is especially applicable.

page_text: The pipes a a connect the ends of the main cylinder A with the valve cylinders in
the corresponding ends of the valve box X of the main cylinder A2 and the pipes a³ a³
connect the ends of the main cylinder A with the valve cylinders at the reverse
or opposite ends of the valve box X of the main cylinder A. It will be readily
understood from the description of Figure 1 that, as the ends of the pipes'a and a³
where they open into the main cylinders A and Aare provided with tappets E and
passages as in Figure 1 the. cushioning is obtained. by the steam or motive fluid.
as hereinbefore described but from the valve cylinders of the opposite main
cylinder.
Having now particularly described. and ascertained the nature of my said.
invention and in what manner the same is to be performed I declare that what I
claim.is:-
1. In engines having valves operated by fluid pressure passages from the cylinders
of the valve or valves to the main cylinder or cylinders so arranged as to cause the
motive fluid from the valve cylinders to be exhausted into the ends of the main
cylinder or cylinders substantially as and for the purpose hereinbefore described.
2. In a duplex pumping or other engine having valves operated by fluid pressure.
passages from the cylinders of the valves to the main cylinders so arranged as to
cause the motive fluid from the respective valve cylinders to be exhausted into the
ends of the opposite main cylinders substantially as and for the purpose herein-
before described with reference to Figure 2 of the accompanying, drawings..
Dated this 12th day of November 1891.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.