IMPROVEMENTS IN VALVES FOR REGULATING THE FLOW OR DISCHARGE OF GAS, WATER, AND
Year: 1875

page_text: LETTERS PATENT to Robert Carey, of Suffolk Grove, Southwark, in
the County of Surrey, and Robert Porter, of Fenchurch Street, in
the City of London, Engineers, for the Invention of "IMPROVEMENTS
IN VALVES FOR REGULATING THE FLOW OR DISCHARGE OF GAS, WATER, AND
93
Sealed the 7th September 1875, and dated the 11th March 1875.
PROVISIONAL SPECIFICATION left by the said Robert Carey and
Robert Porter at the Office of the Commissioners of Patents, with
their Petition, on the 11th March 1875.
We, ROBERT CAREY, of Suffolk Grove, Southwark, in the County of
Surrey, and ROBERT PORTER, of Fenchurch Street, in the City of
London, Engineers, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN VALVES FOR REGULATING THE FLOW OR DISCHARGE OF GAS,
WATER, AND OTHER FLUIDS," to be as follows :—
This Invention relates to an improved construction of valves or cocks
for controlling the passage and discharge of gas, water, and other
Anide 1

page_text: We make our improved valve with a double door or pair of doors
placed back to back, instead of with a single door of wedge shapo as in
ordinary valves. Upon the back of one or both of the said pair of doors
we fix or cast a projection or projections, preferably ribs or rockers of a
curved form in such a manner that the said projections or rockers on
the one door shall bear upon and are jammed upon the corresponding or
opposite part or parts of the other door, when the pair of doors are
pressed together into the wedge-shaped chamber formed by the arrange-
ment of the seatings at an angle to each other. By this arrangement
and construction the two doors are caused to adjust themselves
freely and accurately to their respective seatings whatever the angle
may be.
We prefer to make the points of contact of the aforesaid projections or
rockers at or about the centres of the doors, but these points of contact
may be placed more or less distant rom the said centres when desirable.
The rockers may be so fitted on as to be adjusted in relation to the centres
of the doors to vary the mean of their distances apart to compensate for
wear or otherwise to adjust them.
For the purpose of opening and shutting the double doors together,
we employ a rod or shaft passing through a stuffing box in the body of
the valve. This shaft is connected with both doors by means of a cross
head fitted into recesses in the doors, and may be actuated by a screw or
by a rack and pinion outside the valve, or by other suitable means. Or
a worm may be formed on the lower end of the shaft to work into
corresponding racks upon the backs of the doors.
The said doors are kept in their proper positions when moving by
means of guides fitted to allow the doors sufficient play to permit
of their adjusting themselves easily to their respective seatings.
When these improved valves are intended to be used for gas,
we prefer to make one seating perpendicular or parallel to the body
casting of the valve, and the other seating at an angle to the same, the
door for the parallel seating being pressed out from the other door, and
against the seating preferably by means of two spiral springs in order to
scrape off all tar or other matter as the doors are moved.
When the said valves are to be used for water, we prefer to make both :
seatings with the same angle to the plane in which the doors move to

page_text: open and shut. This is especially desirable when they are to be used
under a considerable head of water, as upon the first backward move-
ment of the screw the doors are freely released from their seatings, and
can be withdrawn with ease.
The freedom and certainty with which the said doors adjust them-
selves to their seatings, prevent any straining of the body of the valvo,
and the consequent distortion of the scatings so common with the
ordinary valves with sliding doors in fitting, which to the precise angle
of the seatings absolute accuracy is practically unattainable.
In fitting our improved valve the distances between the two faces or
seatings and their relative angles are easily conformed to by raising or
lowering, or by filing down the projections or rockers at the back of the
doors until the said doors assume the proper positions against the
seatings.
An indicator is provided when required to show the position of the
double door. This indicator is a rod projecting through the top of the
valve casing, and operated by a screw cut in the worm spindle, and
being inside the valve body it cannot be tampered with or altered with-
out taking off the top. We prefer to make the indicator with a special
stuffing box independent of the stuffing box gland of the aforesaid rod
or shaft.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Carey and Robert Porter in the Great Seal
Patent Office on the 10th September 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, ROBERT
CAREY, of Suffolk Grove, Southwark, in the County of Surrey, and
ROBERT PORTER, of Fenchurch Street, in the City of London, Engineers,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Eleventh day of March, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-

page_text: screw or by a rack and pinion outside the valve, or by other suitable
means. In the valve shewn in Figure 3 a worm & is formed on the
lower end of the shaft d, and works in racks on the back of the
doors to raise and lower them.
The said doors are kept in their proper positions while moving, by
means of wings or ribs e working in vertical grooves or channels fin the
casing a or by other suitable guides, which will keep the said doors in
place while permitting them to adjust themselves easily to their
respective seatings.
When these improved valves or cocks are intended to be used for gas,
we prefer to make one seating perpendicular or parallel to the body or
casing a of the valve, and the other scating at an angle to the same as in
Figure 3, the doors being forced apart and against the seatings, pre-
ferably by means of two spiral springs, so that the said doors may scrape
off all tar or other matter as they are moved. And we sometimes
fill the space between the doors with water to prevent any possibility
of a leakage of gas.
.
When the said valves are to be used for water we prefer to make both
seatings with the same angle or inclination to the plane in which the
doors move to open and close the valve, as shewn in Figure 1. This
construction is especially desirablo when the said valves are to be used
under a considerable head of water, as upon the first backward move-
ment of the screw the said doors will be released from their seatings and
can be withdrawn with ease.
We sometimes make only one part of the slide serve as a tight door,
the opposite part being a disc or an open frame bearing only at intervals
upon the seating, so as to form an abutment for the action of the rockers
upon which the tight (or complete) door can adjust itself to its seatings,
and thus form a single faced self-adjusting valve.
In order to effect the immediate release of the valve when closed
under a great pressure or head of water, wo sometimes make the rockers
on one door or part higher than on the other upon which the pressure
comes, and we arrange the door with the upper rocker to move slightly
in advance of the other. And in some instances we hinge the two doors
together so that they will be moved simultaneously.

page_text: Second. The modification of this device wherein only ono door is
employed as herein set forth.
Third. The combination of the said door or doors fitted in a wedge-
shaped chamber with the rod or shaft, and the means for connecting the
same with the doors so that the opening and closing of the valve is
effected by the turning of the said rod or shaft, as herein set forth.
In witness whereof, I, the said Robert Carey, for myself and on
behalf of the said Robert Porter, have hereunto set my hand and
seal, this Tenth day of September, in the year of our Lord One
thousand cight hundred and seventy-five.
Witness,
JA. EDWARDS,
8, Southampton Buildings,
London.
ROB³. CAREY. (L.S.)