Year: 1887

page_text: Date of Application, 18th June, 1887
Complete Left, 19th Mar., 1888
Complete Accepted, 20th Apr., 1888
† EMILE HATNER of 12 Rue des Charpentiers, Mulhouse (Alsace), Germany,
Engineer do hereby declare the nature of my said invention to be as follows:-
UMILE
Engineer do hereby declare the nature of my said invention to be as follows:-
The object of this invention is a novel construction of safety valve.
This valve is composed
1. Of a seating having two distinct bearing faces.
2. Of a ring valve to fit one of said faces attached to or forming part of a plug.
3. Of an outside movable bell to sit upon the other seat it being guided by the
plug or valve and is pierced at the upper part by several orifices for preventing any
accumulation of steam which might collect in an annular space formed between the
bell and the plug.
The action of the apparatus is as follows.
When an excess of pressure is produced in the boiler, the valve, which is weighted
according to the diameter of its seating rises. The escaping steam cannot at once
find an outlet as it is retained in the space between the inner walls of the bell, it
therefore exerts pressure on the plug, the surface of which is greater than that of the
ring valve, the charge or weight being proportioned to this extra surface.
Should the pressure increase beyond the limit of the weight the valve alone will
rise until the upper part of it comes in contact with the bell which then also rises
with the valve to allow the escape of the steam, the bell being kept in its raised
position until the equilibrium between the weight or charge on the valve and the
indicated pressure of the boiler is re established.
As soon as the boiler is relieved of the excess of pressure the bell and the valve
resume their normal positions.
The principal advantages of this valve are
1. Rapid and gradual relief or disengagement of all excess of pressure.
2. Easy transformation of ordinary valves into rapid evacuation safety valves and
at a small cost.
3. Considerable reduction in the size and weight of all the parts.
4. Simplicity of construction and certainty of action.

page_text: I, EMILE HAFNER, of 12 Rue des Charpentiers, Mulhouse (Alsace) Germany,
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 :-
The object of this invention is a novel construction of safety valve and it is
illustrated in the several views on the annexed drawings, Figure 1 being a part
sectional elevation of the valve when open, and Figure 2 a section of the valve in
the position it occupies when closed. Figure 3 is a sectional elevation of the valve
slightly different in form from that shown in Figures 1 and 2, and Figures 4 and 5,
(Sheet 2) are sectional elevation and exterior view respectively of my safety valve
fitted with spring H suitable for Locomotive boilers.
This valve is composed of :-
1. A seating A having two distinct bearing faces a and b.
2. A ring valve B to fit the bearing face a attached to or forming part of a disc B¹,
and a plug C.
3. An outside movable bell D to sit upon the other seat b, it being guided by the
plug or valve C and is pierced at the part cc by several orifices for preventing any
accumulation of steam which might collect in the annular space E formed between
the bell D and the disc B¹.
The action of the apparatus is as follows:
When an excess of pressure is produced in the boiler, the valve B B and C, which
is weighted according to the diameter of its seating, rises. The escaping steam
cannot at once find an outlet as it is retained in the space d within the inner walls of
the bell D, it therefore exerts pressure on the disc B¹, the surface of which is
greater than that of the ring valve B, the charge or weight being proportioned to this
extra surface.
Should the pressure increase beyond the limit of the weight, the valve B, B¹, C,
alone will rise until the upper part of it comes in contact with the bell D which then
also rises with the valve to allow the escape of the steam, the bell D being kept in
its raised position as at Figure 1 until the equilibrium between the weight or charge
on the valve and the indicated pressure of the boiler, is re-established.
As soon as the boiler is relieved of the excess of pressure the bell and the valve
resume their normal positions as at Figure 2.
In Figures 1, 2, and 3, the valve is shown as arranged for being held down by
weights or levers J, but in Figure 4 and 5 I show the valve with a spring H enclosed
in a casing I as for a locomotive boiler and similar boilers. In Figure 4 the valve
is provided with a small auxiliary stop valve F covering the steam aperture G and
which prevents the boiler from emptying itself in case of breakage or rupture of the
pressure spring.
The principal advantages of my improved valve are ;-
1. Rapid and gradual relief or disengagement of all excess of pressure.

page_text: 2. Easy transformation of ordinary valves into rapid evacuation safety valves and
at small cost.
3. Considerable reduction in the size and weight of all the parts.
4. Simplicity of construction and certainty of action.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is :-
1. The improved safety valve shown in Figures 1, 2, and 3 of the annexed drawings
consisting essentially of a seating A having two bearing faces a, b, ring valve B,
disc B¹ and plug C working within a bell D in the manner set forth.
2. The arrangement shown in Figure 4 for spring pressure, wherein the principal
valve is provided with an auxiliary stop valve F for preventing the escape of steam
from the boiler in the case of rupture of the spring H.