Improvements in Pressure Regulators for Steam Generators.
Year: 1899

page_text: Date of Application, 23rd Dec., 1899-Accepted, 10th Feb., 1900
COMPLETE SPECIFICATION.
Improvements in Pressure Regulators for Steam Generators.
I, MARIUS LOUIS VICTOR EDOUARD VAÏSSE, of 174, Boulevard Malesherbes,
Paris, in the Republic of France, 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 pressure regulators for steam generators in which the
rise or fall of pressure in the generator is adapted to regulate the admission of
air to the ash pit.
The improved regulator is characterised by the fact that the pressure of the
steam is adapted to act directly upon the air admission valve without the use
of transmission parts or mechanism.
The regulator is represented in the accompanying drawing, in which:
Figure 1 is a vertical section of the regulator, and
Figure 2 is an external elevation of the upper portion of the apparatus taken
at right angles to the preceding figure.
The regulator consists of a box a, b which contains mercury and is divided by.
a partition c extending downwards within it. The annular space formed by
the walls a and c is in communication with the steam chamber of the generator
by means of the pipe m. The wall is preferably made in the form of a dome in
order to partially occupy the interior of the box and thus diminish the volume of
the mercury required; it may however be plain, merely constituting the bottom
of the box a.
In either case the wall is provided with an aperture into which is screwed a
tube leaving a passage for the rod e supporting the air admission valve f.
This rod is suspended from the extremity of a screw-threaded rod h which passes
through a milled nut y resting upon a sleeve i fixed to a float j which is immersed
in the mercury within the chamber formed by the circular partitions c.
Upon the milled nut g is loosely mounted an index or pointer & the point of
which is arranged in front of a graduated scale 1.
The operation of the apparatus is as follows:
The pressure of the steam in the generator acts upon the level of the mercury
contained in the annular space comprised between the walls a and c. When this
pressure increases it tends to lower the level of the mercury within this space
and consequently to raise the level in the central space or chamber. The float j
then rises with the mercury and by means of the sleeve i at the same time raises
the milled nut together with the rods h, e and the valve f. This latter
approaches its seat and decreases the section of the passage for the air which is
admitted to the ash pit through the orifices n.
When the pressure falls in the generator the result produced is the inverse of
the above.
The relative positions of the float j and valve f may be regulated by acting
upon the nut g The pointer indicates this adjustment upon the scale l.
It will of course be understood that the forms and dimensions of the various
parts employed in the construction of the improved regulator may be varied

page_text: without thereby affecting the essential characteristics of the arrangement which
forms the subject of this invention, the special feature of this regulator being
that it exerts upon the air admission valve a direct action without the employ-
ment of transmission parts, that is to say without the interposition of any inter-
mediate transmission gear.
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:
A steam pressure regulator for steam generators adapted to act directly upon
the valve for the admission of the air to the ash pit and characterised by a mer-
cury box or chamber divided by a partition into two compartments communicat-
ing at their base, the external compartment being in communication with the
steam chamber of the generator, whilst the internal compartment contains the
float supporting the air admission valve by means of a rod which is adjustable
in length and traverses the float and the mercury chambers, substantially as above
described.
Dated this 23rd day of December 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.