Improvements in Valves for Regulating the Flow of Gases or Liquids.
Year: 1898

page_text: Date of Application, 11th Mar., 1898-Accepted, 23rd Apr., 1898
COMPLETE SPECIFICATION.
Improvements in Valves for Regulating the Flow of Gases or
Liquids.
I, HANS HENRIK SCHOU, of 47, Pilealle, Copenhagen, in the Kingdom of Denmark,
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 :-
My invention relates to valves for automatically regulating the flow of gases or
liquids and is specially adapted for use in heating and cooling apparatus in which
the heating or cooling is effected by admitting a certain gas or liquid in quantities
that have to be correctly regulated in accordance with the temperature that it is.
required to maintain.
In such automatic valves it is of the greatest importance that they should not
easily get out of order and that they should keep perfectly tight. Furthermore the
manipulation should be easy and the resistance against opening and closing reduced
to a minimum.
In regulating valves as generally used stuffing boxes are employed, which are
liable to become easily disarranged and have to be frequently re-packed. As a
rule these valves are opened and closed by means of a screw, that does not always
offer the same resistance against turning.
To obviate the above-mentioned objections I have constructed a valve, which is
illustrated in the accompanying drawing which represents a longitudinal section of
the valve.
The construction is as follows:-
Through a solid body D of iron or other suitable material a hole is drilled, which
hole however is of smaller diameter at ono side of the body D than at the other.
The smaller portion of the hole-the round passage K-is at its inner end shaped
as a valve-seat capable of accommodating a valve V the stem S of which is guided in
the passage K, when the valve moves up or down. The part of the hole above the
valve is closed at its end by means of a screw C. Between this screw and the
valve V is arranged a spiral-spring A, one end of which presses against the screw
and the other against a movable piece B formed as a piston and adapted to transmit
the pressure of the spring centrally to the valve V. The outer end of the passage K
is considerably enlarged so as to form a cavity R, which is closed by means of a
flexible plate M of steel or other suitable material.
The flexible plate M is kept in place by means of a piece F screwed on to the
body D. If necessary packing may be placed between the parts D and F. The
surface of the piece F adjoining D is slightly concave at the centre and into
the concavity the flexible plate M is pressed. The piece F is furthermore at its
centre provided with a hole H.
When the valve is closed the stem slightly projects outside the passage K and
between this end and the flexible plate is arranged a loose block G that is pressed
against the flexible plate M by means of a spiral-spring E. The outer surface of
the block G is somewhat convex and it is of such a thickness that the flexible plate
can only bend to such a degree that it will retain its flexibility even when subjected
to great outside pressure.

page_text: The liquid that has to pass through the valve is admitted into the space abovo
the valve through a passage L in the body D, which passage is suitably connected
with the inlet tube I. The outer end of the passage L is enlarged and provided
with a filter N, through which the liquid has to pass before it reaches the valve V.
By this arrangement grit or other solid particles contained in the liquid arc
prevented from passing through the valve, where their presence might prevent the
valve from closing tightly on its seat. After having passed through the valve V the
liquid flows through the passage K and thence passes through the space between
the block G and body D to a passage O suitably connected with the outlet pipe P.
Inside the hole H is arranged the device for working the valve, which device
may either be moved by hand or automatically. It may for example be part of an
automatic heat-regulator.
As long as the flexible plate is not subjected to any outside pressure the valvo
will remain closed as shown in the drawing. When, however, the flexible plate is
subjected to outside pressure, caused for example by variations in the temperature
of a space in which the temperature should remain constant, the block G will be
lifted and the spring E compressed. Whenever the block G touches the stem of
the valve the latter will be lifted and in rising will compress the spring A. The
liquid entering through I can then pass through the valve V and thence through
the outlet pipe P. This flow of liquid continues as long as the valve V is open or,
in other words, as long as the block G presses against the stem S of the valve.
My improved valve has the advantages of being tight because no stuffing box is
used and of presenting an almost constant resistance, that can only slightly vary
through variations in the pressure of the liquid. Furthermore a valve of this
description cannot stick fast in one position.
Experiments have proved that my valve is specially adapted to form a connection
in automatic heat-regulating devices. Moreover the features of this valve, and
more especially the absence of any stuffing box, render it useful as an ordinary
regulating-valve to be adjusted by means of the hand.
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 :-
1. A regulating valve characterised by a hole drilled through the valve body D,
one end of which hole is closed by a screw C in combination with a flexible plate of
steel or other suitable material closing the other end of the said hole, the flexible
plate being kept in position by means of a covering piece F pressing the edges of
the flexible plate against the body D, said hole being provided with a valve seat
and a corresponding valve V the stem S of which whenever the valve is closed,
projects a little beyond the passage K, forming a part of the above-mentioned hole
whilst between the said stem and the flexible plate is arranged a block G of such a
thickness that the flexible plate cannot be damaged when exposed to great outside
pressure, over which valve the mouth of the inlet tube L is placed, whilst the
outlet pipe P is connected with the passage K under the valve V substantially as
described.
2. In a valve of the kind claimed in Claim 1 the arrangement of a spiral-spring A
placed between the screw C and the valve V and transmitting its pressure centrally
to the valve V by means of a piece B round which the said spring is coiled,
substantially as described.
3. The improved valve hereinbefore described and illustrated in the accompanying
drawing.