Improvements in Pressure Regulators or Governing Devices.
Year: 1899

page_text: Date of Application, 27th Nov., 1899-Accepted, 7th Apr., 1900
COMPLETE SPECIFICATION.
Improvements in Pressure Regulators or Governing Devices.
I, THOMAS RICHARD SHILLITO, of 15, Tooks Court, London, E.C., Engineer, do
hereby declare the nature of this invention and in what manner the same is
to be performed, a communication to me from abroad by the "Phönix"
Maschinenbaugesellschaft, of Berlin, Germany, to be particularly described and
ascertained in and by the following statement:.
This invention relates to a pressure regulator or governing device for regulating
the movements of machinery and is of the kind in which a piston slide valve
with two pressure surfaces each subjected to a special pressure brings about the
movement of a working piston and therefrom also that of a steam, water, or com-
pressed air valve or slide or cock or other organ of a like nature in a manner
Similar to that described in the British Patent Specification No. 4365 of 1897.
Whilst in the known constructions of this kind the full pressure as it comes
from the source of pressure acts upon one working surface or side of the piston
valve, in this invention the full pressure need only be used to actuate the work-
ing piston any desired pressure serving for actuating the piston valve which_
latter by its movements brings the full pressure to act upon the working piston.
In this way various important advantages are obtained for instance the dimensions
of the piston valve have not to be calculated for every difference of pressure on
the one or the other side of the piston valve. The pressure obtaining in the
cylinder of the working piston remains the maximum pressure whilst the pres-
sure for actuating the piston valve may be a reduced or any pressure.
In the accompanying drawing the device of the invention is shewn in vertical
section.
e the
a is the cylinder in which the piston valve bis movable up and down.
inlet leading to underneath the piston valve and which may have in it a reduced
pressure. the inlet which is in communication with the source of pressure,
say a steam generator, and consequently has in it the full pressure, e the exhaust.
f a passage leading to underneath the working piston h. g a passage giving
communication between the cylinder of the working piston and the exhaust c.
i a spring arranged to press upon the piston valve b, but if desired, such pressure
may be obtained in other ways, as for instance, from steam through a pipe
connection.
The device works as follows:-Supposing it, by way of example, to be con-
nected with a source of steam pressure and a reduced pressure present in the
pipe connecting with the inlet c, the inlet d being connected with the full pres-
sure steam pipe. If now a variation of pressure takes place in the pipe con-
nected with the inlet e the piston valve will be moved, and if upward from the
position shewn, the inlet d will come into communication with the passage f
and thus admit direct full pressure steam to act upon the underside of the work-
ing piston and move this latter, which then through its rod and connections
performs the work destined for it, as for instance, the opening, or closing, or
regulating of a valve, cock, or slide. If the working piston passes the passage
the steam in the working cylinder will pass therefrom through this passage and

page_text: the exhaust e to the atmosphere after the piston valve has in the meanwhile
shut off communication between the inlet d and passage f and opened com-
inunication between the passage y and exhaust e.
Therefore the piston valve is moved by a comparatively low pressure acting
underneath it, that is, without the use of the direct full pressure steam by which
the working piston is moved without influencing the piston valve. Thus by
means of a comparatively small expenditure of pressure à greater yield of work
is obtained than with devices of the kind hitherto known, further the device is
more sensitive and the scope of its usefulness enlarged.
Having now particularly described and ascertained the nature of said invention
and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is:
A pressure regulating or governing device in which a piston valve which, is
moved by variations of pressure acting upon it opens and closes the communication
between the source of pressure and a space underneath or behind a working
piston, substantially as described and shewn.
Dated this 27th day of November 1899.
THOMAS R. SHILLITO,
15. Tooks Court, London, 1.C.