Improvements in Apparatus for Controlling the Flow of Fluids under Pressure.
Year: 1892

page_text: Date of Application, 24th Nov., 1892
Complete Specification Left, 23rd Aug., 1893-Accepted, 4th Nov., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Controlling the Flow of Fluids
under Pressure.
I, JOHN CAPARN CALVERT, of the Firm of Calvert & Co., Hope Foundry,
Folly Hall, Huddersfield, in the County of York, Engineer, do hereby declare the
nature of this invention to be as follows
:-
This invention relates to an improved auxiliary valve for controlling the passage
of fluid under pressure to and from one side of a piston that actuates a main valve
for the purpose of closing and opening said main valve and thus regulating the
flow of working fluid to apparatus to be operated, it may be, for example, a
hydraulic hoist or a hydraulic or other motor for blowing an organ or other
purpose.
The casing of the auxiliary valve, which is formed in two parts suitably secured
together, is provided at opposite ends with valve seats and openings, one of said
openings leading to an exhaust pipe and the other leading to a pipe that is
connected with the main supply pipe upon the inlet side of the main valve. The
space within the valve casing between the two valve seats is in communication with
the upper side of the piston which actuates the main valve.
Within the valve casing is a valve formed with a valve face at each end that fit
the above mentioned valve seats, and provided with a spindle which extends
through a stuffing box at one end of the casing. The construction of the valve is
such that when it is in its middle position both the above mentioned openings are
closed and the passage of fluid is prevented; while when it is in either extreme
position one opening is closed and the other open. The valve is moved
longitudinally by means of a hand lever connected to the valve spindle which has
formed upon it a screw that works in a correspondingly screw threaded hole formed
in an arm attached to the valve casing.
When the exhaust opening of the auxiliary valve is closed and the supply
opening open fluid from the main supply passes through the auxiliary valve to the
upper side of the piston thereby closing the main valve the area of which is less
than that of the piston. Upon the auxiliary valve being moved so as to close the
supply opening and open the exhaust opening and the fluid above the piston thereby
relieved of pressure the main valve is raised, the fluid above the piston being
caused to flow back through the auxiliary valve to the exhaust.
The auxiliary valve may be modified to suit special requirements without
departing from the essential features of the invention.
لسم
1000
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Controlling the Flow of Fluids
under Pressure.
I, JOHN CAPARN CALVERT, of the Firm of Calvert & Co., Hope Foundry,
Folly Hall, Huddersfield, in the County of York, 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 :-
This invention relates to an improved auxiliary valve for controlling the passage

page_text: of fluid under pressure to and from one side of a piston that actuates a main valve
for the purpose of closing and opening said main valve and thus regulating the
flow of working fluid to apparatus to be operated, it may be, for example, a
hydraulic hoist or a hydraulic or other motor for blowing an organ or other
purposes.
The casing of the auxiliary valve, which is formed in two parts suitably secured
together, is provided with oppositely arranged valve seats and openings, one of the
said openings leading to an exhaust pipe and the other leading to a pipe that is
connected with the main supply pipe upon the inlet side of the main valve. The
space within the valve casing between the two valve seats is in communication with
the upper side of the piston which actuates the main valve.
Within the valve casing is a valve formed with valve faces, one at each end, that
fit the above mentioned valve seats, and provided with a spindle which extends
through a stuffing box at one end of the casing. The construction of the valve is
such that when it is in its middle position both the above mentioned openings are
closed and the passage of fluid is prevented; while when it is in either extreme
position one opening is closed and the other open. The valve is moved
longitudinally by means of a hand lever connected to the valve spindle which has
formed upon it a screw that works in a correspondingly screw threaded hole formed
in an arm attached to the valve casing.
When the exhaust opening of the auxiliary valve is closed and the supply
opening open fluid from the main supply passes through the auxiliary valve to the
upper side of the piston thereby closing the main valve the area of which is less
than that of the piston. Upon the auxiliary valve being moved so as to close the
supply opening and open the exhaust opening the fluid above the piston will be
thereby relieved of pressure and the main valve will be raised, the fluid above the
piston being caused to flow back through the auxiliary valve to the exhaust.
The auxiliary valve may be modified to suit special requirements without
departing from the essential features of the invention.
Referring to the accompanying sheet of drawings
Fig. 1 is a sectional elevation of an auxiliary valve according to my invention
the inlet being fully open and the exhaust closed.
Fig. 2 is a similar view with the inlet closed and the exhaust open, the arrange-
ment for operating the valves in this case being modified.
Fig. 3 shews to a reduced scale one form of main valve which the auxiliary
valve is intended to control.
The auxiliary valve casing is formed in two parts A. and B. secured or otherwise
fixed together centrally and formed with oppositely arranged valve seats C and D
arranged at a suitable distance apart. Between these valve seats is a valve with
valve faces C and D that engage with the valve seats C and D respectively.
The casing B is chambered out to admit of a branch E through which the actuating
fluid (which enters the casing by the supply branch E¹) flows to and from the
upper side of the piston F (Fig. 3) of the main supply valve to be controlled.
G is an exhaust or discharge branch formed with the valve casing A. The casing A
is provided with a stuffing box and gland a through which projects the double
valve spindle H. In the arrangement shewn in Fig. 1 the upper part of the
spindle H is formed with a screw thread J working in a correspondingly screw-
threaded hole formed in an arm J' secured to the casing A and is actuated by a
lever J, this arrangement may be modified as illustrated in Fig. 2 wherein the
valve spindle H is held down on the valve seat D. by a weighted lever K. that
actuated by a cam K and handle or lever K². When the weighted lever K is raised
the pressure of the actuating fluid beneath the valve H causes it to rise and open
the inlet branch E'.
The valve seats C and D are bored out parallel for a short distance and then
tapered down to a smaller diameter as shewn in Figs. 1 and 2, whilst the body of
the valve that is the part between the valve faces C and D¹ is made to fit and
slide in the parallel part of the valve seats C and D thus forming a piston and a

page_text: taper seated drop valve combined. The arrangement is such that when the valve
spindle H. is in its middle position, neither valve resting ou its tapered seat, the
body part between the valve faces C and D forms a plug having sufficient lap to
close both the passage to the branch E and the passage to the exhaust G. G are
grooves cut in the valve spindle H immediately above the upper valve face to allow
the actuating fluid to escape to the exhaust branch G. In Fig. 1. the exhaust
branch G is closed and the inlet branch E' is full open as is also the branch E
which is connected to the upper end of the cylinder in which works the piston F.
The auxiliary valve connected to the main valve M receives its actuating fluid
from a branch E2 on the main supply valve or supply pipe. When the auxiliary
valve is in action and is in the position represented in Fig. 1. the main valve M will
be closed since the actuating fluid will enter the cylinder above the piston F by
the branch E3 and being at the same pressure as the fluid in the main supply pipe
will, as it is acting on a larger area than the actuating fluid beneath the smaller
piston F and valve, cause the pistons F, F¹ and connected main valve M to descend
and shut off the supply through the branch N to the motor. When the auxiliary
valve is in the position indicated in Fig. 2 the main valve will be full open as
shewn in Fig. 3, the fluid above the piston F as the latter is forced upwards by the
pressure acting below the main valve M escaping through the branch E3 into the
auxiliary valve by the branch E. and thence past the valve seat C. through
the grooves in the valve spindle H into the exhaust branch G where it flows to
waste. The main valve will remain open until the valve spindle H is again raised
to admit the actuating fluid (at the same pressure as that to the main supply) on
the upper side of the piston F which being of greater area causes as above stated
the main valve M to descend on to its seat and shut off the supply to the motor.
By my arrangement of auxiliary valve no soft packing or leathers are required for
keeping the valves tight, and large valves under high pressures may be easily
opened and closed without jar or concussion, the speed at which they work
depending on the relative areas of the auxiliary valves and connecting tubes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. An auxiliary valve having a casing formed in two parts and provided with
oppositely arranged valve seats, each comprising a parallel part and a tapering
part, and an adjustable spindle provided with two valve faces each comprising a
parallel part and a tapering part the arrangement being such that when the spindle
is moved into one extreme position operating fluid can pass between one valve face
and its seat to the main valve or other device to be actuated, when the spindle is
moved into the other extreme position the flow of fluid to the said main valve or
other device will be prevented and fluid that has previously passed to the said
main valve or other device can pass between the other valve face and its seat to the
exhaust, and when the spindle is moved into an intermediate position fluid will be
prevented from passing between either of the said valve faces and its seat
substantially as described.
2. Apparatus for controlling the flow of fluid under pressure to hydraulic
machines such as hoists or the like, constructed arranged and operating substantially
as shewn in and described with reference to the drawings.
02-1
1002
J. C. CALVERT,
By L. W., per F. B.