Year: 1888

page_text: I JOHN WILLIAM JONES of Limefield Middleton in the County of Lancaster
Bleacher and Dyer 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 is designed principally for what are known as
"blow-off" or
blow-through" taps or valves such as are applied to boilers and bleaching kiers,
but it is also applicable to other hot water or steam taps or valves of the class known
as conical plug taps or valves wherein the communication between the entrance and
exit passages is opened and closed by means of a conical plug which is partially
turned round. It is found in practise that in taps or valves of this class when used
for hot water or other liquids or for steam, when the tap or valve is opened the hot
liquid or steam in passing through the valve causes the conical plug to expand so that
it becomes jammed fast in its seat and it is sometimes found impossible to close
the same until all the hot liquid or steam has been run off and the tap or valve
cooled by pouring cold water through it.
The object of my invention is to remedy this defect, by so constructing the tap or
valve that the turning of the plug to open the passage shall at the same time cause
the plug to be slightly raised in its seating and thus all danger of its becoming
"jammed "is obviated.
The nature of my said invention and the manner in which the same is to be per-
formed or carried into practical effect will be readily understood on reference to the
annexed drawing and the following explanation thereof.
"blow-
The drawing represents (for the sake of illustration) a vertical section of a
off" tap or valve made according to my invention, the form of tap or valve being one
wherein a hollow plug is used and the entrance and exit openings are at right angles
to each other, but it will be evident that my invention is equally applicable to taps or
valves wherein the entrance and exit passages are opposite to each other and the plug is
solid with an opening through it at right angles. a is the body of the valve or conical
seating, the top or cover, c the gland or stuffing box, d the conical plug and e the
spindle the upper end of which is squared for the application thereto of a key or
spanner for turning the plug round to open or close the thoroughfare.

page_text: So far the tap or valve is of the usual construction but according to my invention
instead of making the spindle of a plain cylindrical form as usual I cut or form a screw
thread e thereon at the lower portion and I form a corresponding screw thread 61 in
the hole in the cover b through which the spindle passes.
It will be evident that whenever the plug d is turned a quarter of a revolution in
the-direction of the arrow to open the thoroughfare the screw thread el on the spindle e
acting in the screw thread or nut formed in the cover b will slightly raise the
spindle and plug in its seat and thus prevent the possibility of the latter becoming
jammed fast by expansion.
On the other hand when the spindle is turned in the reverse direction to close the
thoroughfare the conical plug will be forced down tightly into its seat and all leakage
will be prevented.
In order to provide against wear the flanges of the body a and cover bare secured
together by six or eight boltsf which are equidistant from each other, and whenever
the plug d becomes slack it can be tightened again by removing these bolts, turning
the cover ba sixth or an eighth round and then re-inserting the bolts.
In taps or valves where the position of the cone is reversed the screw must of course
be arranged so as to lower the plug instead of raising it on turning.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
In conical plug taps or valves for hot liquids or steam, fitting the plug spindle (or
the plug) with a screw thread (or its equivalent)-so that on partially turning the plug
to open the thoroughfare the said plug is by the same action slightly raised or lowered
in its conical seat so as to loosen the same and thus all danger of its becoming
"jammed" by expansion is obviated substantially as hereinbefore described and
illustrated by the drawing annexed.
Dated this 31st day of July 1888
GEORGE DAVIES,
4, St. Ann's Square, Manchester.
Agent for the Applicant.