IM- PROVEMENTS IN AND APPERTAINING TO SPRING SAFETY VALVES
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Thomas Alfred Adamson at the
Office of the Commissioners of Patents on the 19th April 1877.
THOMAS ALFRED ADAMSON, of Liverpool, in the County of Lancaster.
«IM-
PROVEMENTS IN AND APPERTAINING TO SPRING SAFETY VALVES."
This Invention relates to certain improvements in and appertaining to spring
safety valves, combining, firstly, a novel construction of valve; secondly, a novel
construction and arrangement of valve spindle and method of retaining the spring;
thirdly, a novel construction and arrangement of cap or cover; and, fourthly, a
novel construction and arrangement of turning and lifting gear, the parts being so
combined and arranged in a valve box so as to produce a compact and reliable
spring safety valve, being a locked-up valve meeting the requirements of the Board
of Trade.
A spring safety valve constructed according to my Invention consists of a suitable
casting, being a valve box which is provided with a valve seat of ordinary con-
struction, but having its face spherically or otherwise turned or bored to form a
seat for the valve, which consists of a cylindrical trunk, the lower portion being
solid and spherically or otherwise turned to correspond with the valve seat, and
having a lip or otherwise. The upper portion of the cylinder or trunk forms a
casing which contains the retaining spring; the lower or solid portion of the trunk
forming the valve is bored to receive a valve spindle, and is provided with a stuffing
box and gland opening into the trunk or cylindrical casing, the gland forming a
seat for the retaining spring. The valve spindle passes through the valve and
stuffing box, and is entirely independent of the valve and rest attached thereto;
the lower end of the valve spindle passes through the valve box and into the boiler,
or otherwise, and is attached to a dog or cross bar inside such boiler. The upper
end of the valve spindle is provided with a washer or seat for taking the spring and
the thrust thereof; this washer or seat is held in position by a nut screwed on the
spindle and retained by a suitable lock or jam nut. The retaining spring passes
round the valve spindle within the trunk or cylindrical casing formed on the valve,
and is retained between the seats, being the gland and washer herein-before referred
to. The valve box is provided with a suitable cover provided with a bush, through
which works the trunk or cylindrical casing formed on and being part of the valve.
The upper portion of the trunk or cylindrical casing is provided with two lugs

page_text: having vertical slots stopped at the upper ends; the turning or easing gear consists
of a cylindrical ring surrounding the trunk or casing (where it projects through the
valve box cover), and is provided with two lugs or provisions which correspond
with and take into the slots in the lugs herein-before referred to as being on the
trunk or cylindrical casing. The cylindrical ring is provided with two horns on to
which take a suitable easing lever or gear, the horns being also used as the means
for turning the valve on its seat; the cylindrical ring and trunk are surmounted by
a cap which ships on to the locked nuts on the valve spindle and over the cylindrical
ring and trunk; this cap is held in position by two or more bolts or studs, which
secure said cap to the washer or upper seat of the spring; one or more of such bolts
being fastened by a padlock, the valve is secured from being tampered with
The arrangement of spring safety valve, according to my Invention, as herein
described, is equally applicable to single and double valves.