Improvements in Valves.
Year: 1897

page_text: Date of Application, 25th Oct., 1897-Accepted, 8th Jan., 1898
COMPLETE SPECIFICATION.
Improvements in Valves.
I, SIGFRID NILS ELIS LINDSTRÖM, of Grönegatan 5, Lund, in the Kingdom of
Sweden, Engineer, 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 that kind of valve which is adapted to be closed by
the fluid passing through the valve acting upon a piston connected with the
valve proper and having a greater area than the latter. The object of my inven-
tion is to dispense with the external piping usually employed in such valves and
at the same time to simplify their construction and reduce the space occupied and
the weight of the valve. :
In the accompanying drawing a valve arranged in accordance with my inven-
tion is shown in transverse section.
A is the valve-casing, C the valve proper and D the piston connected to it and
working in a cylinder B. According to my invention the piston D and the valve
proper are located on opposite sides of the valve-seat and, in the metal of the
casing, at the outer end of the cylinder, there is arranged a chamber G com-
municating with the said end and adapted to be placed in communication with a
passage H leading from the inlet for the fluid and with a passage K leading to
the outer atmosphere or, when the valve is employed in connection with the steam
pipe of a steam-engine, to the exhaust pipe for the waste steam, the said passage
being located in a piece F screwed into the valve-casing. In the chamber G is
inserted a valve E having one seat at the passage H and another at the passage K.
The valve-spindle extends beyond the piece F and the valve can be moved from
the seat at the passage K to the seat at the passage H by means of a lever fulcrummed
on the valve-casing or by some other contrivance, such as a screw or the like.
The valve operates as follows:When no pressure acts upon the valve E from
without, the fluid will press the valve E against its seat at the passage K, keeping
the latter closed and allowing the fluid to act upon both sides of the piston D.
The fluid consequently can move the valve C from its seat as in an ordinary
valve. If it is desired to quickly shut off the flow of fluid, the valve E is raised
by the lever (or other means) up against the seat at the passage H, thus causing
the fluid to act upon the inner surface only of the piston D while the outer end
of the cylinder is in communication with the passage K. As the piston D is
larger than the valve C, the fluid will quickly close the valve. In case of the
bursting of the pipe leading to the valve the latter will close automatically like
an ordinary valve.
The advantages of the valve described are that it is only dependent on valves
proper for its action, that all passages are located in the valve-casing, and that
the space occupied by the entire valve and its weight are the smallest possible,
which is a matter of considerable importance especially when the valve is used
as a stop-valve for marine boilers.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. In valves in which the valve proper (C) is connected with a piston (D) having
a larger area than the valve proper (C), and works in a cylinder (B) the outer
end of which is directed away from the said valve proper and, by means of a
passage (H) can be placed in communication with the inlet for the fluid to be
passed through the valve, locating the piston (D) and the valve proper (C) on
opposite sides of the valve seat of the latter and placing the inner end of the
cylinder in direct communication with the said inlet while its outer end is adapted
to be placed in communication also with a passage (K) leading to the outer
atmosphere, all for the purpose of causing the fluid, when the passage (H) is
kept open and the passage (K) kept closed, to act upon both sides of the piston (D)
so as to allow of the valve being opened by the fluid, but, when the passage (H)
is closed and the passage (K) kept open, causing the fluid to act upon the inner
side of the piston only and thus close the valve, substantially as set forth.
2. In valves of the kind claimed in claim 1, a chamber (6) arranged in the
valve casing at the outer end of the cylinder (B), the passages (H, K) terminating.
in the said chamber in which is located a double valve (E) having one seat in
each of the passages mentioned so as to allow of the passage (K) being kept closed
by the valve when acted upon by the fluid, the said valve (1) being combined with
suitable means for pressing it from without against the valve seat in the
passage (H), substantially as set forth.
Dated the 25th dove of Octalion 1807
G. F. REDFERN & Co.,
4 South Street, Finsbury, London, Agents for the Applicant.