Improvements in Compound Safety and Low Water Valves.
Year: 1893

page_text: Date of Application, 16th Nov., 1893-Accepted, 16th Dec., 1893
COME LEIE DIECIFICATION.
Improvements in Compound Safety and Low Water Valves.
We, EDWARD NAPIER GALLOWAY, and ARTHUR WALTON GALLOWAY, both
of Knott Mill Iron Works, Manchester, in the County of Lancaster, Engineers, 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:-
Our invention relates to a simple and efficient construction of a compound valve
consisting of a safety valve and a low water valve arranged in one casing, as we shall
describe referring to the accompanying drawings.
Fig. 1 is a vertical section and Fig. 2 is a plan of a compound valve according to
our invention.
Fig. 3 is a vertical section of a modification and
Fig. 4 is a section shewing the levers and weights in the boiler to which the
valves are connected.
On a seating A rests the safety valve B which has preferably a spherical face.
The central part of this valve forms a seating for the low water valve C which is
also by preference spherically faced.
The valve C has its rod D connected in the usual way to a float lever, which,
when the float descends too low owing to deficiency of water raises the valve C
allowing escape of steam and corresponding reduction of pressure in the boiler.
The rod E the lower end of which bears upon the head of the valve B is pressed
down by a lever F which is loaded as desired by a weight or spring. The upper
part of the valve B is made (as shewn in sectional plan Fig. 1A) with lateral
openings for escape of steam issuing past the valve C, and the hole above these
openings which receives the end G of the rod E is made large enough to allow of
the valve C being taken out along with its rod D.
The fulcrum of the lever F is on a knife edge formed in a bridle piece H which
is passed laterally through a slot into a round hole in the upper flange of the
valve cover and is turned one quarter round to receive the end of the lever F
which retains it in position, the lever itself being guided in a notch of the flange
at K.
The pressure of the lever F is delivered on the valve rod E by a centre L
entering a countersunk hole with sufficient freedom to allow a little play. The
upper end of the rod E is so shaped that on the lever F being lifted, the rod E
can be moved and shaken by hand to ascertain if the valve B is free.
When it is desired to connect the valve B to the lever F, the end G of the
rod E is screwed into the hole, and the rod E is connected by a link M to the lever F
as shewn in Fig. 3, in which figure parts corresponding to those in Figs. 1 and 2
are marked by like letters of reference.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. A compound safety and low water valve, substantially as described with
reference to Figs. 1 and 2.
2. In a valve such as is above referred to arranging the low water valve within
a cage formed in the safety valve and fitting the end of the safety valve rod in a
hole of the cage sufficiently large to allow removal of the low water valve,
substantially as described.
3. In a valve such as is above referred to, mounting the safety valve lever with
its fulcrum bearing on a knife edge in a bridle inserted in a laterally slotted hole of

page_text: the flange of the valve cover, and providing on the lever a centre to deliver its
pressure on the valve rod, substantially as described.
4. The modified compound valve substantially as described with reference to
Fig. 3.
Dated this 16th day of November 1803
ABEL & IMRAY,
Agents for the Applicants.