AN IMPROVED ARRANGEMENT OF SAFETY VALVES FOR STEAM, GAS, OR ANY AERIFORM on LARID Rony
Year: 1858

page_text: LETTERS PATENT to James Henry Bennett, Engineer, No. 8, Vamburgh
Place, Leith, in the County of Edinburgh, for the Invention of "AN
IMPROVED ARRANGEMENT OF SAFETY VALVES FOR STEAM, GAS, OR ANY AERIFORM
on LARID Rony"
Sealed the 27th July 1858, and dated the 27th April 1858.
COMPLETE SPECIFICATION filed by the said James Henry Bennett at
the Office of the Commissioners of Patents, with his Petition and Declara-
tion, on the 27th April 1858, pursuant to the 9th Section of the Patent
Law Amendment Act 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
HENRY BENNETT, of No. 8, Vamburgh Place, Leith, in the County of Edinburgh,'
send greeting.
WHEREAS I am in possession of an Invention for "AN IMPROVED ARRANGE-
MENT OF SAFETY VALVES FOR STEAM, GAS, OR ANY AIREFORM OR LIQUID BODY," and
have petitioned Her Majesty to grant unto me, my executors, administrators,
and assigns, Her Majesty's Letters Patent for the same, and have made
solemn declaration that I verily believe myself to be the true and first Inventor
thereof:
NOW KNOW YE, that I, the said James Henry Bennett, do bereby
declare that the following Complete Specification under my hand and seal, fully
describes and ascertains the nature of my said Invention, and the manner in
which the same is to be performed.

page_text: This Invention consists of a new and improved arrangement of safety
valves for steam, gas, or any aireform or liquid body, whereby an escape is
given through the primary action of one or more small valves, consequently
reducing the weights required; at the same time the form of the combined
larger valves prevents any chance of sticking, and also will, in the event of
the pressure within being less than that without, allow the atmosphere to pass
in and save the vessel from collapse.
In the annexed Drawings, Fig. 1 is a sectional elevation of my compound
valve. A, A, are passages, which communicate with the interior of the boiler;
B is the way of escape; C, C, are two valves; and D, D, weights, by which
they are loaded (one or more valves may be used); E is the large escape
valve; K, slide valve slack fit in the seat; and F, combined therewith, is the
disc or piston which opens E, when the pressure within is greater than
required; this disc or piston F has a larger area than the valve E, and
works loosely in the cylinder G. The action is thus:-On the inner pressure
opening the valves C, C, (if the escape round the disc or piston F is insuffi-
cient,) the pressure will impinge upon F, and it having a larger area than
E, E, will be immediately opened, and so give a large way of escape until the
pressure within be reduced to the required point; but should the pressure
within be less than that without, it is obvious that the valve E will be opened,
until an equilibrium is produced. Fig. 2 is an end elevation, and like letters
apply to like parts, as in Fig. 1.
In the Drawings, the valves are shewn as in closed chests, whereby they
are under the control of those who hold the keys; but they can be used open
and with levers or springs instead of weights.
Having now described the nature of my Invention, and the manner of its
operation, what I claim as new and of my Invention, are the two united valves
E and F, combined with the slide valve K in any form that will give a like
action; and I also claim the form of the valves C, C, whereby the full area of
the opening is given when the valve is raised, and I designate my Invention
"Bennett's Compound Safety Valves."
In witness whereof, I, the said James Henry Bennett, have hereunto
set my hand and seal, this Twenty-fourth day of April, One thousand
eight hundred and fifty-eight.
LA
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DUNN INNO
TTTTATCICT TATATTTTCC
JAS. HENRY DENNE
15.