IM- PROVEMENTS IN OR APPLICABLE TO APPARATUS FOR REGULATING THE SUPPLY OR CONDUIT OF GAS OR LIQUID FUEL FOR HEATING PURPOSES BY THE ACTION OF STEAM PRESSURE GAUGE
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by Robert Brewster at the Office of the
Commissioners of Patents on the 25th March 1879.
ROBERT BREWSTER, of 25, Broad Street, Golden Square, in the County of
Middlesex, Manager of the Dental Manufacturing Company, Limited.
"IM-
PROVEMENTS IN OR APPLICABLE TO APPARATUS FOR REGULATING THE SUPPLY
OR CONDUIT OF GAS OR LIQUID FUEL FOR HEATING PURPOSES BY THE ACTION
OF STEAM PRESSURE GAUGE."
This Invention relates to apparatus to be used in conjunction with steam pressure
gauges for regulating the supply of gas or liquid fuel for heating purposes. For
instance, when a vulcanizing apparatus heated by gas is in use it is desirable when
the pressure reaches a given point within the vulcanizing chamber, indicated by
the pressure gauge of such apparatus, that the supply of gas shall be regulated as
needed in the use of such apparatus, and to ensure safety and uniformity of action
by preventing the pressure of steam from becoming greater than is safe in the use
of such apparatus.
I will now describe the apparatus in connection with a pressure gauge.
On the outside of the gauge case is attached a metal union piece, to one end of
which union is secured the gas supply tube, and to the other end of said union the tube
in direct communication with the gas burner or burners. Within the tubular orifice
of the said union is arranged a feathering valve mounted upon a centre stud across
the said orifice, and one end of said valve stud is carried into the pressure gauge
case, and is actuated by mechanism therein, as hereinafter described, so as to open
or close the orifice of the union, and so cut off or allow of the full flow of the gas
through the said union, and so regulate, according to the action of the pressure
gauge, the supply of gas to the burner or burners employed for heating the vul-
canizing chamber..
The apparatus for actuating the regulating valve stud is worked by the main rod
of the gauge, and is as follows:-In connection with the main rod of the gauge
which operates the quadrant or gearing of the index finger of the pressure gauge, is
a small lever working on a centre, and provided with a continuation rod on its
outer arm, said continuation rod being attached to a crank arm or cam on or
actuating the stud of the regulating valve. A perforated screw nut with a milled
head encircles the gauge rod, as also does the end of the lever with the continuation
rod, and the neck of the screw made with the screw thread is screwed through

page_text: a hole in the said lever, where it encircles the gauge rod and acts upon a collar
fixed on the said rod. The milled head of the adjusting screw nut is reached
through a slit or opening in the gauge case; and to adjust the cut off to any pressure
all that is necessary is to elevate or depress the screw nut in the end of the lever by
turning same either to the right or left so as to reduce or increase the distance
between the screw nut and the gauge rod collar.
Now as the gauge rod rises according to the increasing pressure of steam the
lever is actuated by the collar bearing against the screw nut, thereby causing the
continuation rod to actuate the stud of the regulating valve, and so reduce the supply
of gas as requisite to maintain the desired pressure.
The supply of gas to the burner or burners being under control and regulated by
the pressure gauge, it is impossible for the heat to rise beyond the limit of the
gauge, and at the same time the regulator may be set to act at any point or degree
of pressure, and under no circumstances can the heat rise higher than the "set"
point. The regulator does not require resetting each time of using unless a different
heat is desired.
This apparatus may be employed for regulating the supply or discharge of liquid
hydrocarbons or gaseous fuel, such as are employed for furnaces and the like,
wherein is used so called " liquid fuel," whether same is supplied with or without
a blast,