IMPROVEMENTS IN VALVES FOR STEAM OR OTHER ENGINES
Year: 1882

page_text: LETTERS PATENT to Francis Gill of Tyne Dock South Shields in the County
of Durham Brass Finisher, for an Invention of IMPROVEMENTS IN VALVES
FOR STEAM OR OTHER ENGINES
PROVISIONAL SPECIFICATION left by the said Francis Gill at the Office of
the Commissioners of Patents on the 8th November 1882.
FRANCIS GILL of Tyne Dock, South Shields in the County of Durham, Brass
Finisher, "IMPROVEMENTS IN VALVES FOR STEAM OR OTHER ENGINES
"
The object of my Invention is to obtain a valve which will fulfil all the required
functions of admission suppression and release with simplicity of construction and
absence of friction and wear in working.
I construct a cylindrical case which is in communication with the ends of the
steam or other cylinder and with the pipe supplying the steam or other motive
power. Within this case is fitted a cylindrical valve having at each end an
opening or port communicating with the ports in ends of the cylinder and so
placed in relation to each other that when one is open to the cylinder port the
other is closed.
At each end of this cylindrical valve and at right angles to the steam port is an
exhaust port communicating with an opening from the steam chest to the
condenser or to the open air. The cylindrical valve being revolved, either
continuously in one direction, or reciprocally through quarter revolutions or
thereabout, opens alternately to steam at one end of the cylinder and to the
exhaust at the other end, one revolution of the valve, or two quarter revolutions
reciprocally, admitting steam to and exhausting it from each side of the piston.
The working gear of the valve may be any of the most simple ordinary
descriptions for effecting rotary movement and may be worked from the main
shaft or from any other revolving shaft preferably by toothed gearing which by
suitable clutch fitting or other ordinary mechanical expedient may be caused to
reverse the action of the valve and of the engine when required.
When continuous rotation of the valve is not adopted reciprocating rotation may
be effected from any reciprocating point of the working gear of the engine or by
a crank or any other well known mechanical expedient.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Francis Gill in the Great Seal Patent Office on the 8th May
1883.
FRANCIS GILL of Tyne Dock South Shields in the County of Durham Brass
Finisher IMPROVEMENTS IN VALVES FOR STEAM OR OTHER ENGINES
The object of my invention is to obtain a valve which will fulfil all the required
functions of admission suppression and release with simplicity of construction and
absence of friction and wear in working.
I construct a cylindrical case which is in communication with the ends of the
steam or other cylinder and with the pipe supplying the steam or other motive
power. Within this case is fitted a cylindrical valve having at each end an
_opening or port communicating with the ports in ends of the cylinder and so
placed in relation to each other that when one is open to the cylinder port the
other is closed.
At each end of this cylindrical valve and at right angles to the steam port is an
exhaust port communicating with an opening from the steam chest to the condenser
or to the open air. The cylindrical valve being revolved, either continuously in
one direction, or reciprocally through quarter revolutions or thereabout, opens-
alternately to steam at one end of the cylinder and to the exhaust at the other end,
one revolution of the valve, or two quarter revolutions reciprocally, admitting"
steam to and exhausting it from each side of the piston.
The working gear- of-tho-valve-may be any of the most simple ordinary
descriptions for effecting rotary movement and may be worked from the main shaft
or from any other revolving shaft preferably by toothed gearing which by suitable
clutch fitting or other ordinary mechanical expedient may be caused to reverse the
action of the valve and of the engine when required.
When continuous rotation of the valve is not adopted reciprocating rotation may
be effected from any reciprocating point of the working gear of the engine or by a
crank or any other well known mechanical expedient
DESCRIPTION OF DRAWINGS
On the accompanying sheet of drawings I shew the mode in which I propose to
carry out my invention.
Figure 1. is a longitudinal section of a cylinder and valve casing fitted with
cylindrical valve, and steam chest and Figure 2 is a transverse section of same.
A is the cylinder with ports B B' at each end.
C is the cylindrical valve with steam ports D D' and exhaust ports E E¹ at
either end, the valve being in such a position that the port B of cylinder is opposite
the steam port D of the valve, and through it in communication with the steam
chest F, while the other port B¹ of cylinder is in communication with the exhaust
port E of the valve and through it with the condenser or waste steam pipe.
When the piston has completed its stroke in the direction of the arrow the valve C
has by its operating mechanism made one quarter of a revolution the port B' of the
cylinder being now open, through the port D' of valve C, with the steam chest F
while the port
is open through the exhaust port E with the condenser or waste
steam pipe.
Figures 3 and 4 shew respectively a longitudinal and transverse section of the
cylinder A and of the cylindrical valve C which is in this case formed so as to
receive the steam through its interior by the steam branch S the steam ports B B¹
D D¹ and exhaust ports E E¹ being disposed and operating as previously
described.

page_text: Figure 5 is an external view of the valve C and
Figure 6 a transverse section though A B (Figure 5) shewing the steam
ports D D¹ and exhaust ports E E'
The valve is kept steam tight between one end and the other by a packing
piece P fitted with an adjustable spring or by some similar device
It will be seen that the valve is perfectly free from pressure and works almost
without friction in the case. In some cases I propose to fit packing rings to the
valve to further reduce the friction and keep it perfectly steam tight. One
quarter revolution of the valve, whether it is continuously revolved or making
reciprocal portions of a revolution, causes its operation to be reversed and the
engine to run in the opposite direction and this change of position I propose to
effect by clutches operating toothed gear or by a loose wheel with a driver or any
other suitable mechanical device
Having now described my invention and illustrated its practical application
I would have it understood that what I claim as new and secured to me by
Letters Patent is :
A Cylindrical revolving valve working in equilibrium in a casing with ports so
arranged as to admit and release steam or other motive power to or from the
Cylinder the whole constructed arranged and operating substantially as shown
and described
In witness whereof I the said Francis Gill have hereunto set my hand and
seal this fifth day of May in the year of our Lord one thousand eight
L and nighty throa
5 Witness:
T. J. DANSON Fel: Inst: P. A.
Consulting Engineer & Patent Agent
Newcastle on Tyne
FRANCIS GILL (LS.)