Improvements in Back Pressure or similar Valves.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improvements in Back Pressure or similar Valves.
I, JOHN JONES of 40 Sydney Street, Chelsea, in the County of Middlesex,
Builder, do hereby declare the nature of this invention to be as follows:-
This invention relates to valves which may be used for preventing the access of
air in pipes generally for back-pressure or non-return purposes, and as it is peculiarly
suitable for use with overflow pipes for cisterns and the like I will describe it as so
applied.
A difficulty which exists with the flaps or covers which are now generally
employed at the outer ends of overflow pipes from cisterns for the purpose of
preventing the ingress of cold air, is, that these are liable in the presence of
moisture and frost to be frozen to the pipe so that should the water then overflow
it will not escape by the pipe; the valve I am about to describe has the advantage
that it will not freeze and is very light, cheap and easily applied. The valve
itself I prefer to construct of mica or the like which on account of its greasy
nature will not readily freeze in its setting. However other materials possessing
this quality or coated with materials adapted to give that quality and prevent their
setting fast in frosty weather may be employed though the lightness of the mica
is much in its favour. The valve I prefer to arrange in a manner similar to that
of the well known throttle valve of a steam engine, but as the mica is thin it is
preferable to place a seating in the pipe against which the face of the valve may
rest instead of obtaining the tightness by the edges of the valve as in the case of
the ordinary throttle valve. To ensure the valve closing when not forcibly opened
I over-balance it as by hanging it above its centre or providing any convenient form
of balance-weight or spring either upon it or upon its spindle either inside or outside
the pipe; the spindle itself may be formed of phosphor-bronze or other wire or
equivalent secured to the mica and passing through suitable openings in the pipe
which contains it. Or the valve may be hung upon pivots entering recesses in
the pipe or pivot pins may be placed through the pipe to catch the valve. Or
again, if the pipe or casing be suitably shaped the valve may be hinged or hung
from the top or any other convenient disposition of the valve may be made.
The valve may be placed simply in the ordinary pipe or a special pipe, box,
casing or equivalent may be provided for the purpose or it may be fitted into what
is commonly known as a boiler union or overflow adapted to be fixed by screwing
to the cistein. A gauze or equivalent cap or strainer may be placed over or in
front of the opening into the cistern so as to prevent floating obstructions entering
and preventing the closing of the valve.
Dated this 3rd day of September 1895.
BOULT & WADE,
Agents for the Applicant.

page_text: I, JOHN JONES, of 40 Sydney Street, Chelsea, in the County of Middlesex,
Builder, 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 valves which may be used for preventing the access of
air in pipes generally for back-pressure or non-return purposes, and as it is
peculiarly suitable for use with overflow pipes for cisterns and the like I will
describe it as so applied.
A difficulty which exists with the flaps or covers which are now generally
employed at the outer ends of overflow pipes from cisterns for the purpose of
preventing the ingress of cold air, is, that these are liable in the presence of
moisture and frost to be frozen to the pipe so that should the water then overflow
it will not escape by the pipe; the valve I am about to describe has the advantage
that it will not freeze and is very light, cheap and easily applied.
The invention will be best understood by reference to the accompanying
drawings in which
Fig. 1 is a perspective view showing one of my improved valves applied to a
cistern only a portion of which latter is represented and
Fig. 2 is a view of the same partly in elevation and partly in longitudinal
vertical section.
Like letters indicate like parts throughout the drawings.
The valve A I prefer to construct of mica or the like which on account of its
greasy nature will not readily freeze in its setting. However other materials
possessing this quality or coated with materials adapted to give that quality and
prevent their setting fast in frosty weather may be employed though the lightness
of the mica is much in its favour. The valve I prefer to mount in the pipe or
casing B on a spindle or pivot C in a manner similar to that of the well-known
throttle valve of a steam engine, but as the mica is thin it is preferable to place
a seating B₁ in the casing B against which both faces of the valve A may
simultaneously rest instead of obtaining the tightness by the edges of the valve as
in the case of the ordinary throttle valve. To ensure the valve closing when not
forcibly opened I over-balance it as by hanging it by its spindle Cabore its
centre or providing any convenient form of balance-weight D or spring either upon
it or upon its spindle either inside or outside the pipe or casing B; in the drawings
I have represented the valve A as both pivotted above its centre and provided
with a balance-weight, but either of these arrangements without the other may be
employed. The spindle C may be formed of phosphor-bronze or other material
secured to the mica A. and passing through suitable openings in the pipe or casing B
which contains it. Or as shown in the drawings the valve A may be hung upon
pivots Centering recesses B2 in the pipe or casing B, pins or equivalent B 3
being fixed across the recesses B2 to retain the pivots in position; or the pivot
pins may be placed through the pipe B to catch the valve A. Or again, if the
pipe or casing B be suitably shaped such as for example -shape the valve may be
hinged or hung from the top, or the valve may be arranged in any other convenient
manner. A convenient way of securing the spindle C and balance-weight D to
the valve is as shown in the drawings by means of a screw E passing through a
flattened part of the spindle and through the valve A and screwing into the
weight D.
The valve A may be placed simply in the ordinary pipe F or as shown in the
drawings in a special pipe, box, casing or equivalent B screwed on the end of the

page_text: pipe at the inside of the cistern G, a back-nut or equivalent H being screwed on
the pipe F at the ouside of the cistern so as to make a satisfactory joint; or, the
valve may be fitted into what is commonly known as a boiler union or overflow
adapted to be fixed by screwing to the cistern G. The pipe F is eccentric to the
casing B so that at the lower part the interior surface of the former may be level
with, or below that of the latter thereby preventing any accumulation of water in
the casing B.
A gauze or equivalent cap or strainer may be placed over or in front of the
opening into the cistern so as to prevent floating obstructions entering and preventing
the closing of the valve.
I find it preferable to forin the valve seating B' on an incline and in a casting B4
screwed on to the casing B, if desired, however, I may form the seating perpendicular
to the axis of the casing B and integral therewith.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. In a device such as described the combination with a pivotted valve such
as A of a valve-seating such as B¹ with which both sides of the valve simultaneously
make contact substantially as described and illustrated in the accompanying
drawings.
2. A back pressure valve such as described having its outlet eccentric to the
valve casing substantially as described and illustrated in the accompanying
drawings.
3. The complete back pressure valve substantially as described and illustrated
in the accompanying drawings.