An Improved Safety Valve, suitable for Indicating High or Low . Water Level or High Steam Pressure in Boilers.
Year: 1894

page_text: Date of Application, 3rd Oct., 1894
Complete Specification Left, 3rd July, 1895-Accepted, 3rd Oct.. 1895
A
An Improved Safety Valve, suitable for Indicating High or Low
. Water Level or High Steam Pressure in Boilers.
We, JOHN PARKER, of Glyde Terrace, Wakefield Road, Bradford, in tho
County of York, Moulder, aud HARRY PARKER of Tullahome, Coffee County,
Tennessee, United States of America, Timber Merchant, do hereby declare the
Dature of this invention to be as follows:-
:
This invention relates to certain improvements in the arrangement of safety
valves, by so constructing and combining the parts, that, a valve according to the
position in which it is placed inside a boiler will indicate and give visible warning
when the water inside the boiler is above or below its normal working level, and
when placed in the steam space will allow steam to escape when above the
required pressure, and to so construct and combine the working parts with the
valve that they cannot be altered or interfered with so long as the boiler is working
or closed:
On fitting a valve to a boiler, for indicating when the water is too high, or
when it is too low, say in a cylindrical boiler of the Lancashire or Cornish
type, the valve seating frame or support is secured to the front, plate of the
boiler; the said frame being provided with a suitable fulcrum pin for supporting
a lever to which the valve is jointed near to one end, and a float secured near to the
other end of lever, the Intter engaging between arms for preventing the motion of
the boiling water moving the lever from its true position in relation to the valve,
the opposite end of the said lever. near the valve may be provided with a
counterpoised weight rigidly fixed thereon.
When the apparatus is fitted inside a boiler for indicating when the water is
below its normal working level, the valve and float are on the top side of the valve
seating frame, so that should the water be evaporated below its normal level, the
float following same will cause the valve to open and allow steam or water to
escape-through an- opening in front of boiler, such opening, by preference, being
provided with a cap having a number of small holes in same for the purpose of
distributing any escape, and preventing accidents to those in front of the boiler, or
may be conducted by a small pipe to any required position.
Should the valve be required for indicating high' water, the apparatus is fixed
inside the boiler as before described, but at a higher level, and with the valve and
float below the before mentioned valve seating frame, so that when the water rises
above its normal level, the float is raised and the valve opened, thus allowing steam
or water to escape, the valve in either case is protected by a cover enclosing same
and a portion of the lever.
When employing the improved valve for relieving steam above the normal
pressure, the valve is fixed at the top of the boiler, the lever being inside and
supported by a fulcrum pin passing through a bar bracket attached to the
valve block, the valve being coupled to said lever by a piu, and stayed by the
spindle passing through one or more stays in valve casing, the top of which is
provided with a cap over centre of valve, and the outlet branch protected by a pipe
or cap having a number of 'holes therein for allowing steam to escape when the
valve is raised by internal pressure in the boiler.
The copnection between the valve spindle and lever and opening to underside

page_text: of valve is protected by a perforated cover, so that when the valve is fixed,
it cannot be tampered with until the boiler is emptied and the perforated cover
removed.
Dated this 2nd day of nati
COMPLETE SPECIFICATION.
An Improved Safety Valve, suitable for Indloating High or Low
Water Level or High Steam Pressure in Boilers.
We, JOHN PARKER, of Glyde Terrace, Wakefield, Road, Bradford, in 'the
County of York, Moulder, and HARRY PARKER, of Tullahome, Coffee County,
Tennessee, United States of America, Timber Merchant, 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:-
This invention relates to certain improvements in the arrangement of safety
valves by the construction and combining of the parts in a manner that, a valve
according to the position in which it is placed inside a boiler will indicate and give
due warning when the water inside the boiler is above or below its normal working
level; and when placed in the steam space will allow steam to escape when above
the required pressure it is intended the boiler should work; and to so construct
and combine the working parts with the valve that they cannot be interfered with
so long as the boiler is working or closed.
In order that our invention may be fully understood, we will describe the same
in detail by making reference to the accompanying drawings in which
Fig. 1 is a view partly in section of our improved valve secured to the front
plate of say a Lancashire or Cornish boiler and is fixed in the position for indicating
when the water is below its normal working level.
Fig. 2 is a view partly in section of a similar arrangement of valve fixed in the
position for indicating high water.
Fig. 3 is a detached detail bereinafter referred to, and
Fig. 4 is a view partly in section of our improved valve, applied to a boiler, for
relieving steam when above the normal pressure.
When our improved valve is intended for indicating low water, the frame A. is
secured to the inside of the front plate of the boiler in any convenient manner, such
as shown by Fig. 1. Forming part of the frame A. is, the valve seating C. faced
to receive the valve D. which is attached to the lever E. mounted on a fulcrum
pin F, and to one end of the said lever is.secured a float G. preferably of wood or
other light material covered by a casing of thin copper, the opposite end of the
lever being provided with a counterpoised weight 'R.
Should the water in the boiler be evaporated below its normal level, the float G.
will follow the water and operate the lever E. on its fulcrum, and the valve D. in
the direction of arrow, thereby opening the valve and allowing steam or water to
escape through the pipe H. in front of boiler. The end of the said pipe is provided
with a cap similar to that shown in section by detail Fig. 3 with a small hole in
BaDie at for the purpose of allowing a small quantity of steam or water to escape
and thus draw the attention of the stoker to the height of the water in the boiler,
the pipe H. being continued for discharging the remainder and major portion of
the steam or water away from the boiler.
+
The end of lever E. supporting the Hoat G. engages between the arms A' formed
on the valve frame A. in a mauner that, it is free to slide between same, thus
preventing the motion of the boiling water moving the lever E. from its necessary
trhe position in relation to the valve D..and seating.
When our improved valve is intended for indicating high water the apparatus is

page_text: inverted and fixed inside the boiler as before described but at a higher level, that
is above the normal working level of the water with the valve D. lever E. and
float G. suspended below the valve frame A. so that when the water rises above its
normal level, the float G. is raised, thereby operating the lever E. on fulcrum pin F,
opening the valve D. allowing water to escape through the pipe H. arranged for
indicating and conducting it away in the manner as before described. By this
arrangement the attendant has a check upon the water as indicated by the ordinary
water gauge, and is a means of preventing what is known as "priming," and
thereby reducing the liability of damage to the engine receiving its steam supply
from the boiler.
Fig. 4 shews our arrangement as applied for relieving steam above the normal
pressure. The valve seating block A. and casing K. are secured to the top of the
boiler by nut V. secured on the exterior of said block, at the outside of the boiler,
the casing K. being screwed or otherwise secured to the block. The valve D.-is
connected by a spindle L. to the lever E. placed inside the boiler, the said lever
being supported by fulcrum pin F. passing through bracket M. forming part of the
seating block A, the valve spindle L. passes through one or more stays N. for the
purpose of keeping sauce and valve D. in their true path in relation to the valve
seating, the outlet pipe P. being provided with a cap Q. having a number of small
holes Q or the pipe may be extended and discharge the steam away from the
boiler.
Upon the steam in the boiler increasing above its normal pressure, the resistance
to the escape of steam offered by the valve D. through the action of lever E. and
weight R. is overcome, the said valve being raised by internal pressure from its
seat, allows steam to escape through valve and outlet pipe P.
By mounting the lever E. and weight R. inside the boiler and arranging the
valve in the manner described, the apparatus is compact and the valve cannot be
tampered with after once set until the boiler is blown off and cooled down.
The valve D. is protected by a hollow perforated guard or cover J. secured at
its base to the valve frame A. a slot being cut through same for allowing the
lever E. to work. By protecting the valve D. in the manner described, the
liability of any foreign matter that may accidentally get into the boiler or other
vessel being conducted to and forced under the face of the valve D. is reduced, thus
adding to the utility of the apparatus by keeping the valve face clean.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1. An apparatus in which is combined a float, lever, and valve attached to and
supported by a frame having a hollow or pipe communication through the frame
between the beforementioned valve and exterior of boiler or the like all arranged
and operated substantially in the manner and for the purpose as herein before set
forth.
2. A safety valve placed inside a boiler or the like having the valve D. kept in
true line with the valve seating by the spindle L. passing through stay N. combined
with a guard or perforated cover J. all arranged substantially in the manner and
for the purpose as hereinbefore set forth.
Dated this 2nd der of July 1895
JOHN WAUGH,
Agent.