Improvements in Non-return Valves for Steam, Water, Gas, and other Fittings.
Year: 1899

page_text: Date of Application, 29th Mar., 1899
Complete Specification Left, 29th Dec., 1899-Accepted, 17th Mar., 1900
PROVISIONAL SPECIFICATION.
Improvements in Non-return Valves for Steam, Water, Gas,
and other Fittings.
I, THOMAS JAMES CODD, of "Woodside," Fillebrook Road, Leytonstone, in the
County of Essex, Engineer's Draftsman, do hereby declare the nature of this
invention to be as follows:-
My invention relates to improvements in back pressure or non return valves
for use upon steam water, gas or other pipes or mains, the object being to pro-
vide a balanced valve which will offer a minimum amount of resistance to the
free passage of the fluid through the valve body. I also provide a means of seat-
ing the valve on its seat or regulating the amount of opening which can be
oltained when applying my valve to steam heating systems or to other purposes.
In carrying my invention into effect in one convenient manner I construct my
valve body with flanges at opposite ends to suit the main or pipes to be attached.
te it, and I form upon one portion of the inlet branch entering within the chamber
or body a facing surface or seat on to which a flap or gate valve may rest; I
mount this flap valve upon a pivot or pivots formed upon its ends or upon a
spindle passing through suitable bosses provided upon the valve and like bosses
or carriers formed upon or within the body of the valve.
This valve I balance in one simple manner by placing a weight upon an exten-
sion or lever formed upon or attached to the valve. To enable the lever and its
weighted end to vibrate freely. I prefer to place it within a chamber within the
valve casing, such chamber being enlarged from the inlet and outlet branches,
and having its upper end covered by a removable cover or flange.
This cover plate or flange serves the additional purpose of enabling the
flap valve to be readily removed or inspected. On the outer surface of the valve
chamber cover plate I form a boss or flange connection to admit of an air or
other pipe being attached to the same when desired.
To secure the valve upon its seat when employing it in my improved exhaust
steam heating system or for the requirements of other conditions of working
upon mains when it may be desirable to prevent or shut off any outlet or con-
nection through the valve, I arrange a screw or lever which when controlled
from the outside will depress the valve and keep it in close contact with its
seat. When employing a screwed spindle for this purpose I provide suitable
glands and lock nuts to retain the spindle in any position so that the end may be
made to bear upon the valve or to act as a stop to regulate the extent of its
opening or movement away from its seat. Instead of employing a screw I may
arrange a cam or crank lever to be worked or controlled by an outer lever or
arm, the inner crank or cam being made to press firmly upon the valve outer
face or to act as a stop to regulate its movement.
I may connect my controlling or locking screw or lever on to the arm of the
balance weight lever in some cases, or I may arrange the connection so that the

page_text: valve may be lifted from or forced on to its seat when it is desired to use the
valve as a stop valve in any particular position.
I modify the form of my valve and its casing also its connections to suit any
special working conditions and to suit the purposes for which it is to be used.
T
2
1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham, and
25 Cross Street, Manchester, Agents.
v
Improvements in Non-return Valves for Steam, Water, Gas,
and other Fittings.
t
I, THOMAS JAMES CODD, of Woodside," Fillebrook Road, Leytonstone, in the
County of Essex, Draughtsman, 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: —
My invention relates to improvements in back pressure or non-return valves for
use upon steam, water, gas, or other pipes or mains, the object being to provide
a balanced valve which will offer a minimum amount of resistance to the free
passage of the fluid through the valve body.
In order that the means of carrying my invention into practical effect may be
understood, I will describe in detail a convenient manner of so doing, referring
for the sake of greater clearness to the accompanying drawing, as an example.
I construct my valve body with flanged or screwed ends to suit the pipes or
mains to be attached to it, and I form upon one portion of the inlet branch
entering within the chamber or body a faced surface or seat, which may be
formed in any convenient manner commonly employed, and upon which a flap
or gate valve A may rest. I mount the flap valve upon a pivot or pivots formed
upon its ends, or upon a spindle passing through suitable bosses provided upon
the valve and like bosses or carriers formed upon or within the body of the valve;
or I may, as I consider is preferable, mount the valve as shewn in the drawing
upon an arm B forming an extension of a lever C, which lever extension I mount
upon a spindle passing through suitable bosses or supported upon carriers formed
within the casing or through holes made for its reception in the casing or cover
itself.
This valve I balance in one convenient manner by placing a weight D upon
the lever C. To enable the lever and its weighted end to vibrate freely I place
it within the chamber E formed upon or attached to the valve casing. When
forming this chamber E upon the valve casing as part of the same casting, I
cover its upper end by a removable cover plate; and when attaching the same to
the valve body as shewn for example in the drawing it then forms in itself a
removable cover; this cover plate or removable casing serving the additional pur-
pose of enabling the valve to be readily removed or inspected.
Fig. 1 shews a sectional elevation of the valve, and Fig. 2 a section on the
line Y, Z, of Fig. 1.
When employing my balanced valve in connection with my improved exhaust
steam heating system as described in my application for Patent No. 6714 dated
28th March 1899 or for the requirements of other conditions of working wherein
it may be desirable, I may apply my valve in a number of different ways and in
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page_text: 66
various forms as regards the shape of its casing in order to suit the purposes for
which it is to be used. Thus I may apply the lever and weight with its casing
as described or in like manner to the type of check valves known as lifting
check valves," the foregoing description applying equally clearly in such cases.
Also in cases wherein it is desired to secure a quicker closing of the valve
than would be the case when actually balanced, I may so regulate the weight
that although the resistance to the flow of any fluid or gas is partly relieved from
the inlet side, it shall close with sufficient rapidity to meet special requirements.
Further, in cases in which it is required to place the valve in a vertical direction
so that the inlet is the lower end and the outlet the upper end, I may regulate the
weight so as to secure my object.
Instead of employing a weight upon the lever, I may employ its mechanical
equivalents of springs and the like, the use of such being obvious.
To secure the valve upon its seat or to regulate the extent of its opening, I
may arrange a screwed spindle actuated from outside the casing in the usual
manner. In applying such a device to valves of the type known as "swinging
check valves" I prefer the form shewn for example on the drawing, wherein
the lower part of the spindle S is finished by a block F in the shape of an
inverted cup so as to fit over the semi-circular projection G on the valve, the
object of this being to keep contact over the surface of the cup when-closing the
valve, and so that when a force tends to open the valve from the inlet side the
spindle may be placed under a compressing strain only, thus preventing the
spindle becoming bent. This I describe in order that my valve may be more
generally useful, but I do not claim it as part of my invention.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1st. A check valve consisting of a lifting or swinging flap or disc for use upon
steam, water, gas, and other pipes or fittings of a like nature in combination
with a lever extension or arm with a weight thereon for the purpose of balancing
or partly relieving the weight of the said check or non-return valve, substantially
as described.
2nd. A check valve with balancing or relieving device substantially as de-
scribed wherein the weight upon the lever may be so placed or loaded that the
rapidity with which the valve opens or closes may be regulated thereby.
3rd. A check valve substantially as described wherein the weighted lever is
substituted by means of springs or other mechanical equivalents.
Dated this 29th day of December 1899
THOMAS JAMES CODD.