IMPROVEMENTS IN SAFETY VALVES AND DANGER INDICATOR
Year: 1884

page_text: I THOMAS MACKENZIE Fallings Heath N* Wednesbury Engineer do hereby
declare the nature of my invention for IMPROVEMENTS IN SAFETY VALVES AND
DANGER INDICATOR to be as follows:-
My Invention essentially consists of a Cylinder with the necessary passages or
ports, a Piston and Valves working in conjuction with the float, The said Piston
being connected to the hollow stalk of a valve, through which a rod connected to
the float passes, The said rod also actuates another valve in connection with the
Alarm Whistle, there are also other valves varying in size, regulated by the lever
and weight (or dead weight) The passage or port which admits the steam on to
the Piston and also to the smaller valve is of such a size, that would prevent the
ingress of steam into the Cylinder, from being so great as the ogress through the
valves at danger.
Having reference to the Drawings Figure 1 is a sectional elevation, Figure 2 a
front elevation, Figure 3 a sectional plan of Figure 2 at y Figure 4 is a side
elevation, Figure 5 a sectional plan of Figure 4 at y 2, Figure 6 is a front elevation,
Figure 7 a plan of Figure 6 at y 3, Figure 8 shews a method of regulating the
valves by dead weights, The same letters indicate the same parts in all the Figures,
a is a Cylinder made in parts by preference, secured to the Boiler b, The
passage c1 admits steam on to the Piston d, The passage c 2 admits steam to the
valve e, The passage c 3 admits the steam to the smaller valve f, The Piston d
is secured to the hollow stalk of the valve g, through which the rod h passes, having
by preference the valvej attached which is connected to the float k, The rod h
also communicates to the whistle at low water by opening the valve m, The
rod / has the lever n attached carrying the counterpoise weight o, When at low
water the weight comes in contact with the top of the Boiler and thus lessons the
strain on the rod h, The valves e and f are regulated by the weight p on the
lever 9 attached to the eye ?, In working my Invention the steam passes through
the passage c 1 into the Cylinder on to the Piston d. The passage c 2 admits steam
to the valve e, The passage c 3 admits steam to the valve f, By the action of the
float responding to the lowering of the water in the Boiler, it is evident the
rod h will lower with it and thus open the valve m, which admits steam to the
Whistle, thus giving alarm and at the same time lightens the steam on the Piston
Dan B

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which allows the Piston to rise and by so doing opens, the main valve g, which
gives immediato relief to the Boiler when at low water, It will be seen that the
safety valve e is larger than the safety valve f. The said safety valves being
regulated by the weight p and the lever q or dead weights to carry the required
pressure, when the steam rises above the pressure allowed, The larger valve e will
lift the smaller valve f which will lighten the steam on the Piston thus allowing
the Piston to rise which opens the main valve g and allows the surplus of steam to
escape from the Boiler, The passage c1 is of such a size that will not allow the
ingress of steam into the Cylinder to be so great as the egress, so that when the
valve m opens which admits steam to the Whistle through shortness of water in
the Boiler, The Piston quickly rises and opens the main valve.g and allows the
steam to escape from the Boiler, The valve j on the rod h may be dispensed with
if desired, In case the Piston rises to rapidly it may be regulated either by varying
the Port cl, or by an additional Port, My Improved Mechanism may be used
separately as safety valves, to allow the surplus of steam to escape, in this case the
stalk of the valve need not be hollow, although I prefer to use it as described, in
conjunction with the float to give alarm and free the Boiler from steam at low
water.
Having now particularly described and ascertained the nature of my Invention
and in what manner the same is to be performed, I wish it to be understood
that the details may be varied without departing from the nature of my Invention,
I declare that what I claim is
First The main valve being worked and regulated by the steam on the Piston.
Secondly The Piston and main Valve combined.
Thirdly The Hollow Stalk and Valve through which the rod passes connected to
the float to act at low water,
Fourthly Two Valves varying in size working in conjunction with the Piston
which relieves the main valve and frees the Boiler of steam above the registered
pressure,
Fifthly The Mechanism described separately as safety Valves.
Sixthly The Mechanism described as danger Indicator at low water.
Lastly The combination of the safety valves and danger Indicator at low water
for steam Boilers.
Dated this 9th day of December 188%.
Witness!
GEORGE GRIFFITHS,
THOMAS MACKENZIE.

page_text: עועVID
SPECIFICATION.
I, THOMAS MACKENZIE Fallings Heath N Wednesbury Engineer do hereby
declare the nature of my invention for SAFETY VALVES AND DANGER INDICATOR
AT LOW WATER FOR STEAM BOILERS and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
My Invention essentially consists of a Cylinder with the necessary passages or
ports, a Piston and Valves, working in conjunction with the flat, The said Piston
being connected to the hollow stalk of a valve, through which a rod connected to
the float passes, The said rod also actuates another valve in connection with the
Alarm Whistle, there are also other valves varying in size, regulated by the lever
and weight (or dead weights,) The passage or port which admits steam on to the
Piston and also to the smaller valve is of such a size, that would prevent the
ingress of steam into the Cylinder from being so great as the egress through the
valves at danger; Having reference to the Drawings accompanying my Provisional
specification Figure 1 is a sectional elevation Figure 2 a front elevation, Figure 3 a
sectional plan of Figure 2 at y, Figure 4 is a side elevation Figure 5 a sectional
plan of Figure 4 at y 2, Figure 6 is a front elevation, Figure 7 a plan of Figure 6
at y 3, Figure 8 shews a method of regulating the valves by dead weights, The
same letters indicate the same parts in all the Figures, a is a Cylinder made in
parts by preference, secured to the Boiler b, The passage c1 admits steam on to
the Piston d, The passage c 2 admits steam to the valve e, The passage c 3
admits the steam to the smaller valve f, The Piston d is secured to the hollow
stalk of the valve g, through which the rod h passes, having by preference the
valve attached which is connected to the float k, The rod h also communicates
to the Whistle at low water, by opening the valve m, The rod h has the lever n
attached carrying the counterpoise weight o, When at low water the weight
comes in contact with the top of the Boiler and thus lessens the strain on the rod h,
The valves c and fare regulated by the weight p on the lever q attached to the
eyer, In working my Invention the steam passes through the passage c1 into
the Cylinder on to the Piston d, The passage c 2 admits the steam to the valve e,
The passage c3 admits steam to the valve f, By the action of the float responding
to the lowering of the water in the Boiler, it is evident the rod h will lower with
it, and thus open the valve m which admits steam to the Whistle, thus giving
alarm and at the same time lightens the steam on the Piston, which allows the
Piston to rise, and by so doing opens the main valve g which gives immediate
relief to the Boiler when at low water, It will be seen that the safety valve e is
larger than the safety valve f, The said safety valves being regulated by the
weight p and the lever q, (or dead weights), to carry the required pressure, When
the steam rises above the pressure allowed, the larger valve e will lift the smaller
valve which will lighten the steam on the Piston, thus allowing the Piston to rise
which opens the main valve g and allows the surplus of steam to escape from the
Boiler, The passage c 1 is of such a size that will not allow the ingress of steam

page_text: into the Cylinder to be so great as the egress, So that when the valve m opens
which admits steam to the Whistle through shortness of water in the Boiler, The
Piston quickly rises and opens the main valve g and allows the steam to escape
from the Boiler, The valve j on the rod / may be dispensed with if desired, In
case the piston rises too rapidly it may be regulated either by varying the Port cl
or by an additional port, My Improved Mechanism may be used separately as
safety valves to allow the surplus of steam to escape; in this case the stalk of tho
valve need not be hollow; Although I prefer to use it as described in conjunction
with the float to give alarm and free the Boiler from steam at low water.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I wish it to be
understood that the details may be varied without departing from the nature of
my Invention I declare that what I claim is
First The main valve being worked and regulated by steam on the Piston.
Secondly The Piston and main valve combined.
Thirdly The Hollow stalk and valve through which the rod passes connected to
the float to act at low water.
Fourthly Two valves varying in size working in conjunction with the Piston
which relieves the main valve and frees the Boiler of steam above the registered
pressure.
Fifthly The Mechanism described separately as safety valves.
Sixthly The Mechanism described as danger Indicator at low water.
Lastly The combination of the safety valves and danger Indicator at low water.
Dated this 9th day of December 1884.
Witness:
GEORGE GRIFFITHS.
THOMAS MACKENZIE.