IMPROVEMENTS IN CHECK VALVES
Year: 1884

page_text: We JOSEPH ELTON BOTT of 230 Cornwall Terrace Levenshulme in the County
of Lancaster Metallurgical Engineer and SAMUEL JOHN HACKNEY of 2 Rochdale
Road Manchester in the County of Lancaster Brush Manufacturer do hereby
declare the nature of our Invention of IMPROVEMENTS IN CHECK VALVES, to be as
follows:-
Our Invention consists of a combined stop and check valve (for use on steam-
boilers or other receptacles or pipes under pressure) so constructed that the valve
may be readily and safely examined cleaned or repaired whilst under pressure and
which valve is incapable of being burst, for instance, through a pump being started,
without the communication being open, through to the boiler-and is especially
adapted for locomotives, which are often subject to delays incident to faulty check
valves.
In performing our invention we construct the shell of the valve with an outlet
branch communicating with the steam boiler or other pipe or vessel under pressure
and with an inlet leading from a pump or other form of boiler feeder. This shell
contains a hollow taper plug constructed with all outlet passage or orifice
corresponding to the outlet in the shell-and the upper part of which is bored to
receive a cylindrical turning plug by means of which it is rotated on its axis.
The lower part of this plug forms a seat for an ordinary (or ball) check valve-
the outlet to the same communicating with the inlet upon the shell hereinbefore
mentioned and the upper part of the shell being internally screwed to receive a
cap or cover beneath which is a circular lock nut. This lock-nut screws down the
internal screw thread on to the top of the taper plug and is arranged to be turned
along with such taper plug by a key or projection, upon the turning the plug
taking into a corresponding slot both in the taper plug and in the lock-out.
Leakage through the cap or cover is prevented by the compressing surface of the
turning plug automatically tightening the packing in the recess of the said cap
or cover.
The operation of my combined stop and check valve is as follows:-When the
check valve is raised by pressure from a pump or other apparatus, the water or
other fluid passes through the outlets, into the boiler, pipe, or other vessel under
pressure, and should the valve break, strain, or become inoperative by reason of
Duis II
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page_text: obstruction or other causes, all that is necessary is to turn the turning plug by
means of the square on its extremity when the taper plug will be rotated one-
quarter of a turn, thereby, closing the connection between the outlets and at the same
time, the circular lock-nut is screwed down on top of the taper plug by means of
the key, having contact with both slots as aforesaid, thus locking the taper plug so
as to prevent any leakage around its circumference.-When this is done, the cap or
cover may, with perfect safety, be removed, there being no back pressure or
spurting whatever, owing to the expanded fluid being released during the
unscrewing of the said cap or cover.
The turning plug and valve may then be taken out, cleaned, or straightened, or
in case of a broken valve it can be replaced by a spare one, or the seat can be
reground if required, by a grinding plug of suitable material. In the case of
a locomotive this can be done whilst running, and with perfect safety to the
Engineer.
To prevent the bursting of feed pipes or valves in case a pump be started without
placing the valve chamber and boiler in communication we construct the taper plug
with a relief hole at its side at right angles to the outlet to the boiler and also form
a similar relief hole in the shell opposite to such outlet. The object of this is to
allow excess of pressure to pass off through the two relief holes when they are
opposite each other which will be the case when the outlet of the plug is at right
angles to the outlet of the shell and the connection with the boiler is consequently
cut off.
When, however the connection is open between boiler and valve the relief holes
are then at right angles to each other and the water passes into the boiler.
T
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Improvements in Check-valves.
We JOSEPH ELTON BOTT of 230 Cornwall Terrace Levenshulme in the County 3
of Lancaster, Metallurgical Engineer, and SAMUEL JOHN HACKNEY, of 2 Rochdale
Road Manchester in the County of Lancaster, Brush Manufacturer do hereby
declare the nature of our invention of "IMPROVEMENTS IN CHECK-VALVES," and
in what manner the same is to be performed, to be particularly described and,
ascertained in and by the following statement:-
Our invention consists of a combined stop and check-valve (for use on steam-
boilers or other receptacles or pipes under pressure) so constructed that the valve
may be readily and safely examined and cleaned or repaired whilst under pressure.

page_text: and which valve is incapable of being burst for instance through a pump being
started without the communication being opened through to the boiler-and is
especially adapted for locomotives which are often subject to delays incident to
faulty check-valves.
On the accompanying drawing Fig. 1 represents a side exterior view and Fig. 2 a
side sectional view of our improved check-valve.

page_text: ordinarily constructed. In this improved construction two most important safe-
guards are provided.
:
1st To prevent the annular plug D being forced upwards by pressure through the
orifice C in connection with a boiler or other receptacle under pressure the safety
ring E is screwed as illustrated against the plug D by means of a suitable thread
cut in the casing or shell A.
2nd In case the orifices F and C are not properly placed in communication with
each other after examination repair or renewal as aforesaid owing to negligence of
the person in charge the safety orifices M and M' in the plug D' and casing A
respectively will be concentric with each other and so in case pump or other
pressure is exerted the liquid being forced (not being able to pass through F
and C) will escape at a great velocity through the said concentric orifices M and M¹
and thus relieves undue pressure or bursting of pipes (which commonly occurs where
separate stop cocks are used in connection or combination with check valves) and
at the same time indicating and drawing the attention of the person in charge to
the matter so that proper steps may be at once taken to prevent further waste of
water or other fluid.
We do not confine ourselves to the form of angle check valve shewn in Figs. 1
and 2 but where it is preferred to use a horizontal valve we modify the construction
by placing the plug D and inlet and outlet orifices B and C at various augles with
each other as may be desired—whilst the turning key K may have its hexagonal
extremity L cup shaped to act as a cage or buffer for an ordinary ball instead of
the winged check-valve G as shewn in said figures.
To prevent the plug D from turning in the shell A more than is necessary any
mechanical device common for that purpose-such as a pin or stud governing the
rotation of the plug or a cam action on the turning head I similar to the ordinary
gas tap-may be used.
Having now particularly described and ascertained the nature of our invention
and in what manner the same is to be performed we declare that what we
claim is
1st The combination and arrangement of parts constituting an improved check-
valve substantially as shewn and for the purposes specified.
2nd The turning key K operating an annular tapered plug D in a shell or
casing A containing a check-valve G substantially as and for the purpose described.
3rd Forming the safety escape orifices M and M in the plug D and shell A
respectively operating as described and the screwed safety ring E for the purpose
set forth.
A
1
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