Improvements in Screw Down Valves or Cocks.
Year: 1897

page_text: Date of Application, 11th Oct., 1897
Complete Specification Left, 9th July, 1898-Accepted, 20th Aug., 1898
PROVISIONAL SPECIFICATION.
Improvements in Screw Down Valves or Cocks.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency of Foreign
Patent Solicitors, of 11, Burlington Chambers, Birmingham, in the County of
Warwick, 6, Lord Street, Liverpool, and G. Bank Street, Manchester, both in
the County of Lancaster, and 322, High Holborn, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention, which has been
communicated to me by The New Kaiserlautern Iron and Metal Foundry Company
Limited, of Kaiserlautern, Rheinpfalz, in the Empire of Germany, to be as
follows:-
This invention pertains to screw down valves or cocks, and consists in certain
improvements in their construction having for their object the rendering of the
same more positive in their action than hitherto.
In such valves, as ordinarily constructed, it frequently happens that after a
little use the valve-cone does not properly seat itself upon its seating, or that
there is a slight looseness in the screwed shank for operating the same and, in
consequence, an imperfect closure between the inlet and outlet ports is the
result.
To make such a valve or cock a perfect one and to bring about a free and sure
closing of the passage between the parts is the object of this invention, the same
being accomplished by a secondary valve located within the outlet port from the
cock and adapted to be operated simultaneously by and from the main valve.
In carrying out this invention the stalk of the chief valve is provided below the
valve cone and seating and within the outlet port of the cock with a vertical
coned part, formed at its base into a spiral cam or lift. The secondary valve,
which for the purpose is termed a "back stroke valve," is arranged within the outlet
port of the cock at approximately right angles to the axis of the cone, and consists
chiefly of a mushroom head and a stalk, the latter working in guides within the
port body and resting with its end upon the cone, before described, of the chief
valve stalk, and the former seating itself upon a coned seating formed within
the outlet port. This back stroke valve is wholly controlled by the conical part
before described upon the chief valve, and forms a check or a seal to the said
chief valve when its operating means become in any way worn.
If the chief valve is opened the back stroke one is likewise operated by the
coned part upon the chief valve impinging against the end of the back stroke valve
stalk, and the more the chief valve is lifted the more is lifted the back stroke
valve, whilst, on the other hand, if the chief valve is closed the back stroke valve
is likewise closed, this latter being freed from the cone and operated automatically
by pressure of steam or fluid.
To prevent the back stroke valve falling entirely from its seating a stop pin
crosses the outlet port adjacent to the mushroom head, and this to a certain extent
limits the lift of the back stroke valve.
The spiral cam part upon the cone is for the purpose of lifting the stalk of the

page_text: back stroke valve onto the cone should it at any time leave the same, the said
spiral cam part constituting a lead thereto. Thus is constructed a valve or cock
having a main valve and a check valve, the latter being automatically operated
by the former and adapted to check its closing and ensure its effectiveness.
Dated this 9th day of October 1897.
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Agents for Applicant.
1, WHAM PHILLIPS THOMPSON, F.C.S., M.I.ME., of the Agency for Foreign
Patent Solicitors, of 11, Burlington Chambers, Birmingham, in the County of
Warwick, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 322, High Holborn, in the County of Middlesex,
Civil Engineer, do hereby declare the nature of this invention, which has been
communicated to me by The New Kaiserlautern Iron and Metal Foundry Company
Limited, of Kaiserlautern, Rheinpfalz, in the Empire of Germany, and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement: —
This invention pertains to screw down stop valves and cocks, and has for its
object certain improvements in their construction which render them more positive
and certain in their closing action than hitherto.
Li frequently happens in stop valves and cocks of ordinary construction that
after a little use the valve cone will not close properly upon its seating, and
therefore entire communication cannot be cut off between the inlet and outlet
ports. This is of great inconvenience, especially in the case of steam, and in
many cases considerable time is lost in refitting.
To make such a valve or cock a more perfect one and to bring about a free
and sure closing of the passage between the ports is the purpose of this invention,
the same being accomplished by the provision of a secondary or back-stroke valve
which is fitted within one of the ports of the cock and which is adapted to be
operated simultaneously by and from the principal valvo so that when the principal
valve is open the back stroke valve is also open, and when the principal valve is
closed the back stroke valve is closed.
In the accompanying sheet of drawing the invention is shown applied to a
stop cock, of a well known construction, which has formed within its body inlet
and outlet ports cut off by a mushroom headed valve closing an opening within
the divisional wall between the ports. In describing the invention in connection
with the sheet of drawing, the stalk of the chief valve bis provided below its
head part and seating b, and within the port m of the cock, with a coned parte,
forming a lower extension to the chief valve's stalk 6, as aforesaid; a shank part a
intervening between the said head and cone part. This cone part is fashioned
at its lower part, or base. into a cam or eccentric 6, to form à lead or a lifting
means to the back stroke valve in the manner as will be hereinafter fully set
forth. The outer extremity of the cone part is formed into a shank and
works within a guide hole A³ formed within the stop cock's easing A.
The secondary or back stroke valve is arranged within the port approximately
at right angles to the axis of the chief valve, and it consists of a mushroom
hend-part d, a stalk d, and a seating the arrangement being that the said
stalk works in guides within the port's body and its extreme end a rests upon a

page_text: coned part c of the chief valve, and the said mushroom head is adapted to close
upon the cone seating and shut off communication between the parts m² m³ of
the port m. This back-stroke valve is wholly controlled by the coned part c
upon the chief valve and a back pressure and forms a check or a seal upon the
chief valve when the last named operating means becomes somewhat worn.
To prevent the back-stroke valve d, d, falling, when fully opened, away from
its seating, a stop pin s crosses the mouth m² of the port m adjacent to the
valve's head, and this to a certain extent limits the lift of the back stroke valve.
The action of the stop cock according to this invention is as follows:-When
the head of the chief valve b is lifted from its seating, the coned part crises
with it and impinges against the stalk d¹ of the back-stroke valve, which lifts the
latter off its seat, and the more the chief valve is lifted the more, within certain
limits, will be the lifting of the back stroke valve. As the head 63 of the chief
valve closes upon its seating (the coned part e liberates the back stroke valve d, d',
and allows it to close. In opening the valves fully the stalk of the back-stroke
valve may leave the coned part c and drop onto the shank c² in this case on
closing the main valve the cam part e becomes the medium for lifting the stalk, d,
again onto the coned part.
The fitting to each other of the coned part e and the back stroke valve d, d',
is such that a slight freedom, which will insure the hack-stroke valve always
closing by a back pressure whether the main valve is perfectly closed or not, is
allowed, so that the effectiveness of the stop cock is ensured.
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:—
First. In stop cocks or valves, the use of a back-stroke valve arranged in the
lower chamber beneath the main valve and which is adapted to be controlled by
a liquid or fluid pressure and by the chief valve through a moving coned part
carried thereby, so that communication can be surely cut off between the upper
and lower chambers of the cock if the chief valve should not properly close,
substantially as set forth.
Second. In combination in a stop valve or cock, a screw down main valve
having upon its end a coned part e extending into the lower chamber and a guide
shank working in the stop cock's casing, and a back stroke valve d, d, dª³,
arranged within the stop cocks lower chamber so that it can be opened by the
coned part of the chief valve and closed by liquid or fluid pressure, substantially
as described and set forth.
Third. In combination in a stop valve or cock, a screw down main valve having
upon its end a coned part c, a cam part e, and a guide shank extending into
the lower chamber and suitably supported in the casing, and a back stroke
valve d, d', d, arranged within the lower chamber approximately at right angles
to the chief valve, and which is adapted to be opened by the coned part cand
closed by a liquid or fluid pressure, substantially as set forth.
Dated this Sunday
W. P. THOMPSON & Co.,
11, Burlington Chambers, New Street, Birmingham,
Also of Liverpool, London and Manchester,
Patent Agents for the Applicant.