Year: 1899

page_text: WILLIAM BOBY, of 16; Union Court, Old Broad Street, London, Engineer; and
CHARLES BARNARD' WIGG, of 18, De Crespigny Park, Denmark Hill, London,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved form of valve for regulating the pres-
sure in pipes or vessels containing steam or other fluid, and partakes of the
nature of a reducing valve. 1t. has for its special object the production and
maintenance in the exhaust pipe from steam engines of a certain amount of
pressure, which in most cases would not require to exceed about lb. pressure
per square inch, but its application is not confined to this special purpose as it
may be applied to any case in which a reducing valve is required. The valve
may be applied to either horizontal or vertical pipes, or to pipes lying at any
desired angle, and consists of a cylindrical bored seating in which works a
cylindrical valve, the seating being provided at its bottom side with a pro-
jection taking the form of a flange running round the whole of its circumference
and forming a seating upon which the bottom edge of the cylindrical valve rests
this seating and bottom edge of the valve may be fitted and ground together in
the same way as an ordinary valve and seating. The cylindrical seating is
provided with passages or ports pierced through the wall of the cylinder their
length being such that when the valve is lifted to its highest position the ports
may be uncovered and free to admit the passage of steam for their full length.
The ports however are shut off' by the cylindrical valve before the latter reaches
its lowest position. The effect is as follows; when the valve is at its lowest
position the fitted faces above referred to are in contact so that no steam can
pass the valve, when the pressure of steam below the valve becomes sufficient
to lift the weight of the latter it rises and steam then passes between the-lower
edge of the valve and the ground-in seating but no more steam can actually
pass the valve than may be due to the slackness of the fit of the cylindrical valve
in its cylindrical casing, as soon however as the cylindrical valve passes the lower
portion of the ports steam will pass out from the latter, the lower ends of the
ports may be made narrow, the ports widening towards their upper portions so
that the effect will be that when the valve first begins to uncover the ports a
small amount of steam can pass and as the valve rises the proportionate quantity
of steam which can pass rapidly increases. The effect of this arrangement is
that the valve will adjust itself easily to variations of the volume of steam, which
may be required to pass it, without much variation of the pressure of steam
below the valve, the proportion of the travel of the valve which is accomplished
before the ports are opened and similarly after they are closed prevents or
modifies the tendency of the valve to fall rapidly or violently upon its fitted
seating in case of a sudden reduction of the volume of steam or other fluid below
it, or in case of the steam or other fluid having a pulsating motion or pressure.

page_text: The ports or passages may however be made of any desired form other than
the above described shape. The valve may be weighted in any suitable manner
so as to produce the desired pressure necessary to lift it.
Dated this Eleventh day of April. 1899.
WILLIAM BOBY, of 16, Union Court, Old Broad Street, London, Engineer, and
CHARLES BARNARD WIGG, 18, De Crespigny Park, Denmark Hill, London,
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 form of valve for regulating the pres-
sure in pipes or vessels containing steam or other fluid, and partakes of the
nature of a reducing valve.
It has for its special object the production & maintenance in the exhaust pipes
from steam engines of a certain amount of pressure which in most cases would
not require to exceed about ½ lb. pressure per square inch but its application is
not confined to this special purpose as it may be applied to any case in which a
reducing valve is required it may also serve as a relief valve. The valve may be
applied to either horizontal or vertical pipes, or to pipes lying at any desired
angle, and consists of a cylindrical bored seating in which works a cylindrical
valve, the seating being provided at its bottom side with a projection taking
the form of a flange running round the whole of its circumference and forming a
seating upon
which the bottom edge of the cylindrical valve rests this seating and
bottom edge of the valve may be fitted and ground together in the same way as an
ordinary valve and seating. The cylindrical seating is provided with passages
or ports pierced through the wall of the cylinder their length being such that
when the valve is lifted to its highest position the ports may be uncovered and
free to admit the passage of steam for their full length. The ports however are
shut off by the cylindrical valve before the latter reaches its lowest position.
The effect is as follows, when the valve is at its lowest position the fitted faces
above referred to are in contact so that no steam can pass the valve, when the
pressure of steam below the valve becomes sufficient to lift the weight of the
latter it rises and steam then passes between the lower edge of the valve and the
ground-in seating but no more steam can actually pass the valve than may be due
to the slackness of the fit of the cylindrical valve in its cylindrical casing, as
soon however as the cylindrical valve passes the lower portion of the ports steam
will pass out from the latter, the lower end of the ports may be made narrow,
the ports widening towards their upper portions so that the effect will be that when
the valve first begins to uncover the ports a small amount of steam can pass and as
the valve rises the proportionate quantity of steam which can pass rapidly increases.
The effect of this arrangement is that the valve will adjust itself easily to
variations of the volume of steam which may be required to pass it, without
much variation of the pressure of steam below the valve, the proportion of the
travel of the valve which is accomplished before the ports are opened and similarly
after they are closed prevents or modifies the tendency of the valve to fall rapidly
or violently upon its fitted seating in case of a sudden reduction of the volume of

page_text: The valve
steam or other fluid below it, or in case of the steam or other fluid baving a pul-
sating motion or pressure. The ports or passages may however be made of any
desired form other than the above described shape. The valve may be weighted
in any suitable manner so as to produce pressure necessary to lift it.
itself may be constructed with the above desired passages or ports pierced in its
walls instead of the ports being made in the seating and the fitted faces may be
placed at the top of the valve and seating respectively instead of at the bottom.
Figs. 1, 10 and 11 show sections through vertical and horizontal yalves Fig. 1
representing a vertical valve having the ports pierced in the walls of the seating,
Fig. 11 a horizontal valve with the ports similarly pierced in the walls of the
seating the fitted edges in both cases being at the bottom of the valve and seat-
ing respectively, Fig. 10 shows a vertical valve having the ports pierced in the
walls of the valve itself and taking the form of teeth and the fitted edges at the
top of the valve and seating respectively. In all the views similar letters refer
to similar parts. Referring to Fig. 1 A is the cylindrical valve, B is the seating
having raised sides L in which the valve fits loosely, CC are the conically
shaped edges of valve and seating respectively, which are fitted together so as to
make a steam-tight joint, D are openings in the seating, D¹ is a space between
the top of the conical seating of the casing C and the bottom of the opening D,
E is a spindle upon which is keyed a lever F, G is a spindle screwed at one end
into the valve A and at its other end provided with a joint arrangement so
arranged that as the valve A and spindle G moves up and down they cause
the lever F to vibrate. H is another lever keyed upon the end of the spindle E
which projects outside of the main valve casing for the purpose of receiving the
lever H, upon lever H are weights J and K which can be adjusted so as to load
the valve A as desired, Fig. 2 shows an enlarged view of one of the openings
in the valve seating L, c is a narrow portion of the opening D, f f are sloping
sides forming a tapered shape to the opening D immediately above e. Suppose
steam to enter at M in the direction of the arrow at a slightly greater pressure
than that to which the valve is loaded, valve A moves upward the first effect being
that the edges C C₁ separate and a small amount of steam can pass owing to
the loose fit of the valve A in seating L the valve continuing to rise passes e Fig. 2
and more steam can escape but still in no large volume, and if a larger quantity
of steam continues to enter at M the valve A rises giving a freer outlet to the
steam past ff and eventually the whole height of the openings D) is uncovered
and full vent given to the steam. If the steam be suddenly cut off from the
source of supply valve A falls gradually the form of the openings throttling the
steam remaining at M, and when the valve passes below e the remaining steam is
almost imprisoned and A comes to rest on C C₁ without shock. The spindle G
coming in contact with stop N prevents valve A from rising too high. The form
of the seating L may be varied so as to give a greater port opening in proportion
to the lift of the valve, without destroying the gradual action of the release of
the steam or other vapour. Fig. 3 shows the seating L cut away so as to leave a
space P between valve A and the casing L for the portion of the seating above
the sloping sides f f. The shape of the openings may be varied as shown at
Figs. 4, 5, 6 and 7 or to any other desired modification of Fig. 2, the essential
being that the openings or seatings are so shaped and placed that as valve A rises
the release of steam begins slightly increasing in a more rapid ratio as the valve
rises, and similarly diminishes in an unequal ratio as the valve falls. The
edges CC may be set at right angles to the body of the valve instead of being
conical as shown at Fig. S. The valve may be loaded by any suitable means,
with or without the employment of levers, and similarly may be guided and
stopped by any suitable devices other than those shown in the drawing.
In Fig. 10, B is the valve seating or casing. A is the valve in which the open-
ings D are pierced and taking the form of teeth as shown, D¹ is the space between
the lower edge of the conical portion C and the top of the openings D.

page_text: Having now particularly described and ascertained the nature of our said
invention & in what manner the same is to be performed we declare that
what we claim is;-
(1) In a valve for the release of steam or other fluid a cylindrical valve and seat-
ing working one within the other the seating provided with tapered openings in its
walls and the seating provided also with a projection upon which a portion of
the valve rests forming fitted edges a certain distance being deft between the
above-named projection and the ends of the tapered openings as described and
shown and for the purposes set forth..
(2) In a valve for the release of steam or other fluid a cylindrical, valve, and
seating working one within the other the valve provided with tapered openings
in its walls and the valve provided also with a projection which rests upon a
portion of the seating forming fitted edges a certain distance being left between
the above-named projection and the ends of the tapered openings as described
and shown and for the purposes set forth.
(3) In a valve for the release of steam or other fluid a cylindrical valve and
seating working one within the other the seating provided with openings in its
walls of any suitable form as described and shown and for the purposes set forth.
Dated this Tenth day of January 1900.
WILLIAM BOBY.
CHARLES BARNARD WIGG.