Improvements in Equilibrium Taps, Cocks, or Faucets.
Year: 1890

page_text: Dite of Application, 13th Oct., 1890-Accepted, 22nd Nov., 1890
COMPLETE SPECIFICATION.
Improvements in Equilibrium Taps, Cocks, or Faucets.
I JAMES YATE JOHNSON of 47 Lincolns un Fields in the County of Middlesex
Gentleman do hereby declare the nature of this invention which has been com-
municated to me from abroad by Edward Andrew Loughry and James Loughry
both of Redfern near Sydney in the Colony of New South Wales Engineers and
William John Adams of Sydney aforesaid Merchant and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement:—
This invention relates to equilibrium pressure taps cocks or faucets that is to taps,
cocks or faucets which are used in positions where pressure is equal or nearly equal
at the supply and discharge ends when they are in open position and it has been
devised specially so that a tap cock or faucet of such description will automatically
cut off or close the source of pressure should the pressure at the discharge or "off"
end be relieved. By this invention a tap cock or faucet may be produced especially
suitable for use in positions such as between a steam boiler and its gauge glasses or
its steam gauge and between steam boilers and steam cylinder lubricators &c. where
in the event of accident the escape of steam and water from the boiler would be
automatically cut off and the danger of scalding attendants and of other damage be
minimised.
These improvements in equilibrium pressure taps cocks or faucets consist first and
essentially in the combination and arrangement in and with the through passage of
the plug of a valve preferably a ball valve and secondly in the particular construction
or configuration of the through passage of such tap so as to form a seating for a ball
valve at one end thereof and prevent a seating for such at the other end thereof.
But in order that this invention may be clearly understood reference will now be
made to the drawings herewith in which Figure 1 is a sectional elevation of two
equilibrium pressure taps cocks or faucets as applied to the water gauge of a steam
boiler and Figure 2 is a sectional elevation of the tap itself.
A is the body or casing of the tap. B the plug and C the handle. A' is tapered
socket or barrel for plug. A is through port or passage.
A³ narrowed but elongated
part thereof. B¹ is ball forming a valve. B is through passage. B³ is bell mouth
or valve chamber with tapered part forming valve seat. B countersunk discharge
end. CCC³ mark the various positions taken by the handle (in use.
parts of the drawings are those well understood in the construction of water gauges
for steam boilers and forming no part of this invention need no reference.
The other
The plugs B in their normal position have the handles down or in position C¹ when
the ball valves B' are also in their normal position. Now when relief of pressure on
outside of the tap takes place occasioned say by any sudden rush of steain or water
such as occurs when a gauge glass breaks or bursts the ball valves B' assuming the
positions shown in dotted lines seated against the tapered part of chamber B³ cut off
or prevent the escape of steam and water from the boiler. To release the ball
valves B from their seats after replacing glass or blowing through handlo C is
reversed to position and the plug communicates with boiler through end B* and
pressure now entering to the gauge glass equilibrium is established and the ball
valve B rolls back into its normal position and the handle reversed back to its
normal position C³.
In cleaning a gauge glass or in allowing steam to pass through the tap to a drip
or waste pipe the plug say of the top tap of gauge glass mountings is reversed
to position and waste tap opened. The passage A³ being narrowed and elongated
prevents the ball valve B' from seating and thus steam or water freely passes when
plug in reversed position.

page_text: Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
First. In equilibrium taps cocks or faucets the combination and arrangement with
and in the through passage of the plug of a valve preferably a ball valve substantially
as berein described and explained.
Second. In equilibrium taps cocks or valves the construction or configuration of
the through passage therein having a valve chamber containing a valve at one end
and a flaring mouth at the other end of the plug passage and a discharge orifice in
the barrel upon which the valve in the plug cannot seat itself substantially as herein
described and explained.
Third. The particular construction of equilibrium taps cocks or faucets in the
manner substantially as herein described and explained and as illustrated in the
.drawings.
Dated this 13th day of October One thousand eight hundred and ninety.