IMPROVEMENTS IN VALVE BOXES OR STOP BOXES USED FOR REGULATING THE COMMUNICATION BETWEEN HYDRAULIC PRESSES AND PUmps
Year: 1871

page_text: LETTERS PATENT to John Richard Forman, of Kingston-upon-Hull, in
the County of York, Mechanical Draughtsman, for the Invention
of "IMPROVEMENTS IN VALVE BOXES OR STOP BOXES USED FOR REGULATING
THE COMMUNICATION BETWEEN HYDRAULIC PRESSES AND PUmps.”
Sealed the 26th September 1871, and dated the 20th April 1871.
PROVISIONAL SPECIFICATION left by the said John Richard Forman
at the Office of the Commissioners of Patents, with his Petition,
on the 20th April 1871.
I, JOHN RICHARD FORMAN, of Kingston-upon-Hull, in the County
of York, Mechanical Draughtsman, do hereby declare the nature of the
said Invention for "IMPROVEMENTS IN VALVE BOXES OR STOP BOXES USED FOR
REGULATING THE COMMUNICATION BETWEEN HYDRAULIC PRESSES AND PUMPS," to
be as follows:-
The object of this Invention is to simplify the construction of the
valve boxes or stop boxes employed for regulating the communication
between hydraulic presses and pumps, and consists in dispensing with
one of the screwed spindles, and with the necessary pinions for gearing
the double spindles together, as hitherto employed, and in substituting
a single screwed spindle for the purpose, working in a chamber or

page_text: compartment arranged with three passages, two of which are situated
directly opposite to and concentric with each other, and the third leading
off to the hydraulic press. This spindle has tlie usual conical end for
closing the bottom passage which leads to the pressure side of the
hydraulic pump, and it is also provided near its lower extremity with
an enlarged part or boss the upper annular edge of which is also made
conical, but in an opposite direction, so as to act as a valve for closing
the top passago leading back to the pump cistern. It will thus be seen
that if my spindle is so placed that neither passage is closed the liquid
will pass from the hydraulic pump back to the cistern without having
had any effect upon the press, but if the spindle is raised until the top
valve is closed the liquid will then pass into the hydraulic press, and
if the spindle is depressed until the bottom valve is closed the liquid
will be free to flow back from the press into the cistern, thus acting on
the same principle as the old stops, in a much simpler manner. When
a back pressure or check valve is used it may be placed beneath the
spindle, in which case the lower end of the spindle would act as a stop
for such valve to strike against, whilst at the same time the lowering|
of the spindle would close the back pressure or check valve.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said John Richard Forman in the Great Seal Patent
Office on the 6th October 1871.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
RICHARD FORMAN, of Kingston-upon-Hull, in the County of York,
Mechanical Draughtsman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria; by Her
Letters Patent, bearing date the Twentieth day of April, in the year
of our Lord One thousand eight hundred and seventy-one, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said John Richard Forman, Her special
licence that I, the said John Richard Forman, my exccutors, admi-
nistrators, and assigns, or such others as I, the said John Richard
Forman, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,

page_text: use, excrcise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN VALVE BOXES OR STOP BOXES USED FOR REGULATING THE
COMMUNICATION BETWEEN HYDRAULIC PRESSES AND PUMPS," upon the condition
(amongst others) that I, the said John Richard Forman, my executors
or administrators, by an instrument in writing under my, or their, or
one of their hands and scals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE, that I, the said John Richard Forman, do hereby
declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The object of this Invention is to simplify the form of the valve boxes
(or stop boxes) employed for regulating the communication between
hydraulic presses and pumps, and consists in dispensing with one of the
screwed spindles and with the necessary pinions for gearing the double
spindles together as hitherto employed, and in substituting a single
screwed spindle for the purpose, working in a chamber or compartment
arranged with three passages, two of which are situated directly opposite
to and concentric with each other, and the third leading off to the
hydraulic press. This spindle has the usual conical end for closing
the bottom passage which leads to the pressure side of the hydraulic
pump, and it is also provided near its lower extremity with an enlarged
part or boss, the upper annular edge of which is also made conical
but in an opposite direction, so as to act as a valve for closing the top
passage leading to the pump cistern. It will thus be seen that if my
spindle is so placed that neither passage is closed the liquid will pass
back from the bydraulic pump to the cistern without having any effect
upon the press, but if the spindle is raised until the top valve is closed
the liquid will then pass into the hydraulic press, and if the spindle
is depressed until the bottom valve is closed the liquid will be free
to flow back from the press into the cistern, thus acting on the same
principle as the old stops, but in a much simpler manner.
When a
back pressure or check valve is used, it may be placed beneath the
spindle, in which case the lower end of the spindle would act as a stop

page_text: for such valve to strike against, and at the same time the lowering of
the spindle would close the back pressure or check valve.
In order that this my said Invention may be the more readily seen
and understood I have hereunto annexed a drawing of a valve box
(or stop box) having my improvements applied thereto. Similar letters
of reference marked on the several views of the Drawings are used to
denote similar parts.
Fig. 1 is a front sectional view, Fig. 2 a side sectional view, and
Fig. 3 an exterior plan (or top view) of a valve box (or stop box) con-
structed according to my Invention and arranged to work three hydraulic
presses, either of which may be set to work or lowered whilst the pumps
are in motion.
In all the views A represents the body of the valve box (or stop box)
having a passage B formed through it at the bottom, communicating
at either end with the pressure side of the hydraulic pumps, which are
connected thereto by the ordinary connecting pipes C and unions or
nuts D. Three compartments E are also formed in the body A com-
municating with the passage B through the openings F (which are
each fitted with back pressure or check valves G), and communicating
with the hydraulic presses through the side passages and pipes H
(seen more clearly in Figs. 2 and 3). In the upper part of each of
the compartments E is fitted a hollow boss or washer I, which rests
upon a shoulder J and has a recess formed at its upper end to receive
the cupped leather K, which cupped leather and hollow boss I arc
held in position by the nut L. The stop spindles M (which are
actuated by the handles N) are screwed through the nut L, and the
lower extremity of cach spindle is formed with an enlarged part or
boss O, the bottom of which forms a stop for the back pressure or
check valve G, whilst the upper annular edge of the boss O is made
conical and so forms an inverted valve P, which may be screwed up
against a corresponding seating Q formed at the bottom of the hollow
boss or washer I, and so close the communication between the com-
partments E and the side passage R which leads from the hollow boss I
to the hydraulic pump cistern.
The action of this improved valve box (or stop box) is as follows:-
If it be desired to work the hydraulic presses the spindles are in
the position indicated upon the Drawing, the inverted valves P being
closed against their seatings Q, and the back pressure valves G being

page_text: free to open to admit the water from the pumps which enters through
the pipes C, passes through the passage B up the openings F into the
compartments E, from whence it finds its way through the side passages
and pipes H into the hydraulic presses. If one of the presses is not
required to be worked the stop spindle appertaining to it may be lowered
a little so as to open the inverted valve P and yet not to close the back
pressure valve G, when the liquid will pass from the hydraulic pump
back to the cistern through the side passage R without having any
effect upon the press, but if the stop spindle is lowered, so as to close
the back pressure valve G, the liquid will be free to flow back from the
press through the side passage H, compartments E, and side passage R,
into the hydraulic pump cistern. It will be readily apparent, instead of
using the back pressure or check valves G, that the bottom end of the
stop spindles may be tapered and thus form the valve for closing the
opening F in the ordinary manner.
Having thus particularly described and ascertained the nature of this
my said Invention, together with the best methods with which I am
acquainted for carrying the same into practical effect, I wish it to be
understood that I do not confine myself to the precise details, relative
proportions, or dimensions of the several parts of the hydraulic valve
box illustrated on the accompanying Drawings, as the same may be
considerably varied without departing from the Invention, but what I
claim is, the use and application to valvo boxes (or stop boxes) of a
hollow boss or washer fitted with a side passage and forming a seating
for an inverted valve arranged on the stop spindle as and for the purposes
described.
In witness whereof, I, the said John Richard Forman, have here-
unto set my hand and seal, this Second day of September, in the
year of our Lord One thousand eight hundred and seventy-one.
JOHN RICHARD FORMAN. (L.S.)
Signed and sealed in the presence of
JOE WILLIAM HAWDON,
Draughtsman,
Old Foundry, Hull.