NEW OR IMPROVED AUTOMATIC APPARATUS FOR EJECTING WATER OR OTHER FLUIDS FROM STEAM CYLINDERS, CHESTS, AND PIPES, OR OTHER VESSELS, CONDUITS, OR RECEPTACLES
Year: 1877

page_text: PROVISIONAL SPECIFICATION left by Robert Montgomery at the Office of the
Commissioners of Patents on the 8th August 1877.
"A
ROBERT MONTGOMERY, of Greenock, in the County of Renfrew, North Britain.
NEW OR IMPROVED AUTOMATIC APPARATUS FOR EJECTING WATER OR OTHER FLUIDS
FROM STEAM CYLINDERS, CHESTS, AND PIPES, OR OTHER VESSELS, CONDUITS, OR
RECEPTACLES."
This Invention has reference to that class of apparatus for ejecting water or other
fluids from steam cylinders or other vessels in which the action depends upon the
expansion and contraction of metals under different degrees of temperature, and the
said Invention consists in constructing the said apparatus in a simple and efficient
manner, whereby they are rendered stronger and more convenient in use, and their
cost of construction and repair is much lessened.
The said apparatus as constructed according to this Invention consists of an outer
iron or brass tube, in the interior of which is suspended a brass tube of so much less
diameter as to leave a space between it and the outer tube. The inner tube is held
in its place in the outer tube by means of a ring or washer at the top of the said
inner tube, encircling its outer circumference, resting upon the top of the outer tube,
and being kept firmly in place by a perforated cap which screws upon the outer
tube, and has an internal shoulder which bears upon the ring to which the inner
tube is attached, and forces it firmly to its seat on the top of the outer tube. This
cap is formed with a screwed continuation at top by which the trap is secured to
the cylinder or part where it is to be used.
The inner tube has at its lower end a valve seat formed or fixed on it of larger
internal diameter than is the bore of the said inner tube, and of sufficient external
diameter to bear against the lower part of the interior of the outer tube and act as a
guide.
By making the valve seat of larger diameter than the interior of the inner tube
a less length of inner and outer tubes can be employed, as the opening made by the
contraction of the inner tube will be larger in proportion to the diameter of the said
inner tube than in steam traps as ordinarily constructed. Immediately beneath
this valve seat is a valve having guides or wings passing into the inner tube or into

page_text: the enlarged valve seat.
The connecting piece for the escape water pipe is screwed
on to the lower end of the outer tube and extends to some distance below the lower
end of the inner tube, and has at its side an inclined screwed hole through which
passes a screw for regulating the distance of the valve from its seat. This screw has
a taper or conical end, and the hole in the connecting piece through which the said
regulating screw passes is at such an inclination that the side of the conical end of
the screw which is uppermost will form a rest for the valve which is always parallel
with the valve seat. The use of this regulating screw, passing as it does through
the side of the escape water pipe connecting piece, leaves the bottom part of the said
connecting piece immediately beneath the valve free for the connection of the escape
water pipe, which connection is thereby much simplified.
On steam gaining admittance to the apparatus the expansion of the inner tube,
caused by the elevated temperature, closes the valve at the bottom of the said
tube, but on water of condensation accumulating in the said tube the temperature
is lowered, the tube contracts and the valve is opened and permits of the escape of
the said water.