IMPROVE- MENTS IN STEAM SAFETY VALVES
Year: 1880

page_text: LETTERS PATENT to Philip Middleton Justice, of 14, Southampton Buildings,
in the County of Middlesex, Patent Agent, for an Invention of "IMPROVE-
MENTS IN STEAM SAFETY VALVES." A communication from abroad by Joseph.
Barbe, of Brussels, in the Kingdom of Belgium.
PROVISIONAL SPECIFICATION left by the said Philip Middleton Justice at
the Office of the Commissioners of Patents on the 19th November 1880.
PHILIP MIDDLETON JUSTICE, of 14, Southampton Buildings, in the County of
Middlesex, Patent Agent. "IMPROVEMENTS IN STEAM SAFETY VALVES:" A com-
munication from abroad by Joseph Barbe, of Brussels, in the Kingdom of Belgium.
This Invention relates to that class of automatic safety valves which are
governed or "set" by means of a lever and weight.
The valve being preferably applied to the bottom or water surface of the boiler.
The Invention consists essentially of the combination of the following parts:-
A hollow cap or piece secured to the boiler and fitted with an internal open ended
section of pipe which extends for a short distance into the boiler. In the external
portion of said cap is fitted a short piece of flanged pipe or socket of gun-metal or
other suitable material in which rests a moveable plug valve, which is supported
and held in place by means of a lug or piece pivotted to the end of the weighted
lever bar. The fulcrum for said lever is provided by a supporting piece attached
at one extremity to the hollow cap, and being pivotted at the other to the lever
bar at a point intermediate to the moveable plug and lever weight.
The apparatus operates as follows:-The lever bar being marked, the weight is
set at the point, equallizing the pressure at which it is desired the boiler should
blow off. When this pressure is reached the water passing through the internally
projecting pipe and forced by the pressure of the steam presses down the moveable
plug valve, the water and steam thereby escaping or being "blown off."
The internally projecting pipe prevents the passage to the moveable plug valve
of all scale or other boiler deposits.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Philip Middleton Justice in the Great Seal, Patent Office on the
16th May 1881.
PHILIP MIDDLETON JUSTICE, of 14, Southampton Buildings, in the County of
Middlesex, Patent Agent. "IMPROVEMENTS IN STEAM SAFETY VALVES." A com-
munication from abroad by Joseph Barbe, of Brussels, in the Kingdom of Belgium.
This Invention relates to that class of automatic safety valves which are
governed or "set" by means of a lever and weight.
A
The valve being preferably applied to the bottom or water surface of the boiler.
The Invention consists essentially of the combination of the following parts,
substantially as shown in the Drawings which form part of this Specification, in
which Fig. 1 represents a side elevation partially in section of a boiler with the
valve attached; Fig. 2 represents an end elevation also partially in section.
hollow cap or piece A is secured to the boiler. Within said cap A is fitted a short
piece of flanged pipe or socket of gun metal or other suitable material B in which
rests a moveable plug valve C, which is supported and held in place by means of
a lug or piece D pivotted to the end of the weighted lever bar G. The fulcrum F
of said lever is provided by a supporting piece E attached at one extremity to tho
hollow cap A, and being pivotted at the other to the lever bar at a point inter-
mediate to the moveable plug C and lever weight H. The hollow cap and valve
may be surrounded by a pipe or casing J to prevent the contact of the flame from
the furnace therewith. The apparatus operates as follows:-The lever bar G being
marked, the weight is set at the point equallizing the pressure at which it is
desired the boiler should blow off. When. this pressure is reached the water
passes through the cap, and forced by the pressure of the steam presses down the
moveable plug valve C, and the water and steam thereby escape or are blown off."
If desired, an internally projecting pipe may be used to prevent the passage to the
moveable plug valve of scale or other boiler deposits.
"
Having thus fully described the nature of my Invention as communicated to
me by my foreign correspondent, what I claim and desire to secure by Letters
Patent is,-
The arrangement and construction of parts which form the improved safety
valve, substantially as hereinbefore described and for the purposes set forth.
In witness whereof, I, the said Philip Middleton Justice, have hereunto set
my hand and seal, this Sixteenth day of May, in the year of our Lord
1001
Signed and sealed by the said
Philip Middleton Justice in
the presence of
ALLEN P. JONES,
14, Southampton Bldgs.,
W.C.
PHILIP M. JUSTICE. (L.S.)