IMPROVEMENTS IN FLUID PRESSURE REGULATING VALVES
Year: 1884

page_text: 1 JOHN AULD, of the firm of David Auld and Sons, Engineers, and Founders, of
Whitevale Foundry, Glasgow, in the county of Lanark, do hereby declare the
nature of my said Invention for "IMPROVEMENTS IN FLUID PRESSURE REGULATING
VALVES," to be as follows:-
This Invention relates to improvements in the construction of fluid pressure
regulating or reducing valves.
As ordinarily constructed pressure regulating or reducing valves are arranged to
allow the passage through them of any quantity of steam or other fluid at a
pressure not exceeding that for which the valves are weighted or set, so that if a
reducing valve be fitted in connection with a boiler or steam supply pipe, so long
as the pressure of the steam consumed is less than that which would close the
valve, the steam may be withdrawn, and it may be impossible to maintain a
pressure in the boiler or supply pipe equal to the working pressure desired in the
boiler. The object of this Invention is so to construct and arrange pressure
regulating or reducing valves that they will close at any given pressure, and
maintain in the boiler or supply pipe a pressure always in excess of, or at least
equal to, that for which the valve is set, so that it allows to pass to the consumer
only such quantity of steam as is maintained in the boiler or supply pipe at a
pressure in excess of that required. For this purpose, I use a single or double bent
or equilibrium valve fitted within a valve casing provided with the usual inlet and
outlet connections, and which is arranged to open by the high pressure steam
acting on the valve or on an elastic diaphragin connected to it, and is closed
positively by an external or weighted lever, or by means of a spring, deadweight, or
other contrivance, such as an additional elastic diaphragm acted on by the steam in
such a manner as to have a tendency to close the valve and only open when the
steam supply is in excess of the pressure which the weight or other contrivance is
set to balance.
To obtain effective opening of the valve by the least possible movement of the
weighted diaphragm or piston, the valve spindle may be connected to the diaphragun
through an internal lever which is arranged to increase the extent of opening of the
valve in relation to the movement of the diaphragm,
A cleaning door or sludge door is fitted in connection with the diaphragm to
adinit of any sludge or dirt which may collect on the diaphragm or piston being
removed periodically.
Dated the low of T1004

page_text: I, JOHN AULD, of the firm of David Auld and Sons, Engineers and Founders, of
Whitevale Foundry, Glasgow,. in the County of Lanark, do hereby declare the
nature of my said Invention for "IMPROVEMENTS IN FLUID-PRESSURE REGULATING
VALVES," 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 improvements in the construction of fluid-pressure
regulating or reducing valves.
As ordinarily constructed, pressure regulating or reducing valves are arranged to
allow the passage through them of any quantity of steam or other fluid at a pressure
not exceeding that for which the valves are weighted or set, so that if a reducing
valve be fitted in connection with a boiler or steam supply pipe, so long as the
pressure of the steam consumed is less than that which would close the valve, the
steam may be withdrawn, and it may be impossible to maintain a pressure in the
boiler or supply pipe equal to the working pressure desired in the boiler.
The object of this Invention is so to construct and arrange pressure regulating or
reducing valves that they will close at any given pressure, and maintain in the
boiler or supply pipe a pressure always in excess of, or at least equal to that for
which the valve is set, so that it allows to pass to the consumer only such quantity
of steam as is maintained in the boiler or supply pipe at a pressure in excess of that
required. For this purpose, I use a single or double beat or equilibrium valve
fitted within a valve casing provided with the usual inlet and outlet connections,
and which is arranged to open by the high pressure steain acting on the valve or
on an elastic diaphragm connected to it, and is closed positively by an external
weighted lever or by means of a spring, dead-weight, or other contrivance, such as
an additional elastic diaphragın acted on by the steam in such a manner as to have
a tendency to close the valve and only open when the steam supply is in excess of
the pressure which the weight or other contrivance is set to balance.
A cleaning door or sludgo door is fitted in connection with the diaphragm to
admit of any sludge or dirt which may collect on the diaphragın or piston being
removed periodically.
In the accompanying Drawings, Figures 1, 2, 3, 4 and 5 are vertical sections of
different modifications of the improved reducing valves.
The reducing valve, shown in Figure 1 consists of the usual chamber A, with
steam iulet and outlet divided by a web or partition B forming a seat for the
valve C which is of the ordinary form but fitted to open in the direction in which
the steam flows. The valve is connected by a spindle D direct to a plunger or
diaphragm E within a tubular casing F which is provided with a sludge door f for
cleaning. The valve spindle is prevented from turning by means of a gland and
bolts D¹. The end of the spindle is continued beyond the diaphragm, and is
connected to a weighted lever G which serves to press the valve against its seat
and keeps it closed, so long as the steam pressure does not exceed that for which
the weight is set.
When the steam pressure on the inlet side of the valve chamber is sufficient to
open the valve, the steam passes through, and any excess of pressure is relieved.
The escaping steam acts on the diaphragm and balances the back pressure upon the
valve.
In the example shown in Figure 2, an additional diaphragm II, and diaphragm
chamber Hare provided, steam being admitted from the inlet to the chamber H

page_text: by the pipe I. The area of the lower diaphragm H is less than that of the upper
one E, and than that of the valve which it serves to counter-balance, and permit of
the use of a lighter weight. Figuro 3 illustrates a similar arrangement, the two
opposing diaphragms being contained within a single casing, and the use of the
weighted lever being dispensed with. In lieu of connecting the pipe I to the inlet
side of the valve as shown in full lines, it may be connected to the outlet as
indicated by the dotted lines, the area of the diaphragm E being in the latter case
less than that of the valve. The areas of the two diaphragms should bear a fixed
ratio to each other, depending upon the pressure of steam it is desired to maintain
on the inlet or outlet side of the valve. Figure 4 illustrates an arrangement of
reducing valve similar to that represented in figure 1, the valve C being connected
to the diaphragm E through a lever J. Figure 5 also represents an arrangement
similar to that shown in ligure 1, the valve C being however in this case a double
beat valve.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, 1 declare that what
I claim is,―
The improved arrangement or combination of parts of fluid-pressure regulating
valves, substantially as herein described and illustrated, and for the purpose set
forth.