Improved Pressure Reducing Valve.
Year: 1889

page_text: Date of Application, 22nd Feb., 1889-Accepted, 13th July, 1889
COME DETE
Improved Pressure Reducing Valve.
We, RUDOLF GUSTAV SCHMITZ, and HEINRICH WEDERMEYER, of 11, Krausenstrasse,
Hanover, in the German Empire, Manufacturer 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 :-
Our invention relates to pressure reducing valves and consists in an improved
arrangement or construction of pressure reducing valve chiefly intended for use with
carbonic acid apparatus for the purpose of reducing the pressure of the gas issuing
from the reservoir containing the liquefied gas to a pressure low enough to exclude all
danger in use. On the drawing appended hereunto the improved reducing valve is
shewn in vertical section.
The inlet tube a communicating with the liquid reservoir is firmly and tightly con-
nected to the reducing valve casing. The latter consists of the lower part A and
The inlet tube a com-
upper part B between which a flexible membrane C is fixed.
municates through a small orifice with the part. A. Centrally with the axis of the
tube a a sliding cylindrical bar bis arranged in a bush c fixed to the casing. The bar b
is prevented from turning by a pin 6' moving in a slot of the bush e and carries at
the front a washer d forming the valve, the back end e being shaped inclined to the
axis of the bar.
The membrane C is stretched between the parts A and B of the casing, and has two
discs and attached to it. The upper discs of carries at its centre a stud g
surrounded by a strong helical spring h, while from the lower disc f¹ a stud i descends
behind the bar b and is guided in the lower casing A. A set-screw k is screwed
through the stud i, and the incline e of the bar b rests against it.
The spiral spring h reaches into a hollow boss in which a piston m can be raised or
lowered by means of a screw n for the purpose of tightening or loosening the spring.
The carbonic acid issuing from the tube a presses on the underside of the membrane C
and tends to lift it, while the spring which can be regulated to any desired pressure
by means of the screw n, tends to depress the membrane and must be compressed
before the membrane can be lifted. When the pressure of the carbonic acid in the
apparatus upon the membrane exceeds the pressure of the spring, the membrane is
lifted and with it the set screw k. The latter acts on the incline e of the bar b and
moves it to the right, so that it closes with its washer d the outlet orifice in the tube a
until the pressure in the valve casing has fallen below or to the pressure of
the spring h. As the pressure falls, the membrane is pushed down by the
pressure of the spring and the set screw k moved downwards, so that a clearance
between it and the incline e of the valve bar b is formed, and the carbonic acid issuing
from the tube a pushes the valve bar d back.
Obviously the arrangement of screw and incline may be reversed and the incline
formed on stud i and a set screw screwed into the bar b, or a vertically adjustable
incline on in combination with an incline on b may be used.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we declare that what we claim is,
The arrangement or construction of pressure reducing valve substantially as
hereinbefore described and illustrated by the drawing.
Dated this 21st day of February 1889.
EMMOTT & Co.,
Agents for the Applicants.