IMPROVEMENTS IN VALVES
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by the said Benjamin Walter Davis at
the Office of the Commissioners of Patents on the 22nd March 1883.
BENJAMIN WALTER DAVIS, of Lambeth, in the County of Surrey, Engineer,
"IMPROVEMENTS IN VALVES"
My invention relates to valves for use in pipes et c.; and is designed to afford
an efficient and safe valve easily accessible for cleaning, repair, or other purpose,
which shall allow of the, seatings being turned or bored, and shall indicate the
opening or closing of the passage.
-
My invention consists of a plate or diaphragm valve, capable of rotation with
a spindle, the said spindle passing through a cover, suitably bolted on to a flange,
and formed with a cross-head, which serves the double purpose of an indicator of
the position of the valve, and therefore of the orifice, and a means of rotation.
My valve may assume several modifications, according to the exigencies of
circumstance.
Where the valve is in a four way pipe, it is in the form of a diaphragm, bearing
circumferentially against circular seatings, and of sufficient diameter to close either
pair of orifices across which it may be turned. When the valve is in a threeway
pipe, where it is only desired to close one orifice at a time, it is a diaphragm in the
form of a sector of a circle, of such an angle as to bring the ends on to the
concentric seatings at any orifice to which it may be rotated. When the valve is
in a two-way pipe, it is in the form of a straight diaphragm, which rotates on to
seatings turned concentrically with its axis of rotation upon projections in the
pipe. In the preceding cases, where alternative passages exist, safety is thus
ensured, as an exit is always open to relieve pressure.
At elbows and joints, the plate form of valve is preferable, seated directly upon
the circular seating of the orifice and turning concentrically therewith upon a grid.
This modification may consist of a single plate, or of a plate and an upper disc.
closing an escape pipe. In the latter case the valve is spring pressed to any
suitable resistance, and when the pressure exceeds the resistance, the valve and the
diso are raised from their seatings, and the excess pressure finds vent through the
escape.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Benjamin Walter Davis in the Great Seal Patent Office on the
.22nd September 1883.
BENJAMIN WALTER DAVIS, of Lambeth, in the County of Surrey, Engineer,
"IMPROVEMENTS IN VALVES "
This invention relates to valves for use in pipes etc., more particularly where
situated in Hot Water and Steam heating apparatus, and it is designed to afford
an efficient and safe valve, easily accessible for cleaning, repair, or other purpose,
which shall allow of the seatings being turned or bored, and shall indicate the
opening or closing of the passage, and which shall always afford adequate. relief
for pressure.
This invention consists of a plate or diaphragm valve, capable of rotation with a
spindle, the said spindle passing through a cover, (suitably bolted on to a flange),
and formed with a cross head, which serves the double purpose of an indicator of
the position of the valve, and therefore of the Orifice, and a means of rotation.
The valve may assume several modifications, according to the exigencies of
circumstance, and these I now proceed to describe with reference to the drawings
hereunto annexed, in which like letters refer to like parts.throughout the figures.
Fig. 1. shows a valve in a four way junction in plan and sectional elevation.
Fig. 2. shows a valve in a Tee pipe.
Fig. 3. shows a valve in a straight way pipe.
Fig. 4. shows a valve and plan of its seating in an elbow.
Fig. 5. is a diagram showing the operation of the valves.
Where the valve is in a four way junction, shown at Fig. 1, it is in the form
of a diaphragm A, bearing circumferentially against seatings B, formed concentrically
therewith The diaphragin A is of sufficient diameter to close either pair of orifices
across which it may be turned. This is more clearly shown at a, a, in the
diagram of a house heating system, Fig. 5,-where. the valve appears in alternative
positions. The diaphragm has a rigid spindle C passing through the cover of the
valve casing, and bearing a cross head D, which serves to operate the valve, and
at the same time indicate its position.
When the valve is in a Tee pipe, as shown in Fig. 2, where it is only desired to
close one orifice at a time, it is a diaphragm A, in the form of a sector of a circle,
of such an angle as to bring the ends on to the seatings B, concentric with its axis,
at any orifice to which it may be rotated. This is shown in b, b, in the diagram of
a system, Fig. 5, when. the valve appears in alternative positions. The spindle C,
passing through the cover of the valve casing, is rigid with the diaphragm A, and
bears a cross head D; which serves to operate the valve and at the same time
indicate its position.
In the preceding cases, where alternative passages exist, safety is ensured, as an
exit is always open to relieve pressure.
When the valve is in a straight way pipe, as shown in Fig. 3, it is in the form of
an upright diaphragm A, which rotates on its rigid spindle C; on to seatings B
(formed concentrically with the spindle) upon projections E in the pipe. The
spindle C passes through the cover and bears a cross head D, which serves to
operate the valve, and at the same time indicate its position.
At elbows and joints, the plate form of valve is preferable, seated directly. upon
the circular seating of the orifice, and turning concentrically therewith upon a grid.
This modification I illustrate in Fig 4. It consists of a plate A turning on the
grid B.
The plate A has a rigid spindle C, which passes up through the cover,

page_text: and has a cross head D, which serves to operate the valve, and at the same time
indicate its position. An escape H is formed in the upper part of the valve box,
and its mouth is closed by a plate F upon the valve spindle. This plate F is
spring pressed by a suitable spring G to any desired resistance, and when the
pressure exceeds the resistance, the valve is raised from its seating, and the excess
pressure finds vent through the escape. This valve is shown at C in the diagram
of a system, Fig. 5.
Having now fully described and ascertained the nature and objects of my
invention be it known that what I consider novel and desire to protect is:—
(1) In a rotary valve for a four way junction, the combination of a diaphragm
rigid with spindle having an indicating cross head with concentrically turned
seatings, Substantially as and for the purposes specified.
(2) In a rotary valve for a Tee pipe, the combination of a segment shaped
diaphragm rigid with a spindle having an indicating cross head with concentrically
turned seatings, substantially as and for the purposes set forth.
(3) In a rotary valve for a straight pipe, the combination of a diaphragm rigid
with a spindle, having an indicating crosshead, with concentrically turned seatings,
substantially as and for the purposes set forth.
(4) In a rotary valve, the combination of a plate, seating on a grid, and rigid
with a spindle having an indicating cross head, with an upper spring pressed
plate or valve seating in the mouth of an escape pipe, substantially as and for the
purposes set forth.
In witness whereof I the said Benjamin Walter Davies have hereunto set my
hand and seal this twenty first day of September in the year of Our Lord One
thousand eight hundred & eighty three.
Witness :-
H FULLER
23 Kood Lane
London E.C.
Draughtsman
BENJAMIN WALTER DAVIS
(L.S.)