Improvements in or relating to Pressure Reducing or Controlling Valves.
Year: 1890

page_text: Date of Application, 8th Apr., 1890-Accepted. 19th July, 1890
Improvements in or relating to Pressure Reducing or Controlling
Valves.
I, CARL SCHÜTZ of Anau, Bohemia, Coppersmith, do hereby declare the nature
of this invention and in what manner the saine is to be performed, to be particularly
described and ascertained in and by the following statement :--
The object of this invention is a valve adapted to be used for reducing and controlling
the pressure of steam or gas at high pressure so as to enable such steam or gas to be
used for purposes for which it can only be employed at low pressure.
My pressure reducing or controlling valve is shown in the accompanying drawings
in which
Fig. 1 is a side elevation.
Fig. 2 a longitudinal section.
Fig. 3 a top view or plan, and
Fig. 4 a cross section on the line of figure 2.
The valve consists of a case A in the lower portion of which is a single seated
valve E; above this valve there is a double piston K of a peculiar shape constructed
in such a manner that the diameter of the lower piston corresponds to the size of
the valve while the dimensions of the upper piston depend on the extent to which the
apparatus is desired to control or reduce the pressure. The double piston is turned
true and smooth and moves within the equally smooth walls of the casing A so as to
fit the same exactly. The tightness of the fit is however ensured also by means of
an asbestos or equivalent packing embedded in the grooves vv. The projections i i
at the top and bottom of the double piston serve to limit the stroke or range of
motion of the valve.
To enable the steam to pass from the inlet pipe into the outlet pipe, a connecting
channel or port is provided integral with the casing. Between the two pistons a
space n is provided which if the valve should fail to fit air-tightly would fill with the
water resulting from condensation which of course would interfere with the proper
working of the valve. To prevent this however a pipe r (figs. 1 and 4) is screwed
into this part for the discharge of the condensation water. The top or lid is also
provided with a pipe r fastened to it in the usual way and connected with the pressure
gange.
The steam whose pressure it is desired to control or reduce enters at a lifts valve E
from its seat and issues through the lateral passage and the connecting tube b.
The size of the upper piston is such however that when the steam within the valve-
case reaches a certain predetermined pressure at which the pressure sustained by
the piston is slightly greater than the upward pressure acting upon the valve E, the
piston descends and closes the said valve. When the equilibrium is destroyed again,
that is when the upward steam pressure sustained by the valve E increases this
valve rises again until it is once more pressed down upon its seat by the piston.
The valve E thus performs a continuous vibrating motion whereby the pressure above
it is at all times equalized or balanced almost to a nicety.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
A pressure reducing or controlling valve characterized by the arrangement of a valve
such as E and double piston such as K guided in a suitable chamber the object being
to cause the reduced steam pressure entering the upper portion of the case A

page_text: through the port C and acting upon the larger piston to overpower the pressure of
the unreduced steam upon the valve E; so that the latter may be closed by the
said double piston substantially as described and illustrated in the accompanying
drawings.
W. P. THOMPSON & BOULT,
Agents for the Applicant.