Year: 1886

page_text: Date of Application, 9th Aug., 1886.
Complete Left, 11th Feb., 1887.
Complete Accepted, 18th Mar., 1887.
I ADAM DAVIS GLACE, of Rocklin, in the County of Placer, and State of California,
United States of America, Machinist do hereby declare the nature of this invention to
be as follows:-
My invention relates to valves adapted to check the back flow or pressure of fluids,
and has for its object to provide a simple, inexpensive valve of this character which
will close positively to cut off a back pressure or current of fluid, thereby promoting
the durability of the valve and avoiding an overheating of an injector or inspirator
employed to force water through the valve as when feeding steam boilers and
preventing waste of any fluid passed through the valve.
The body or case of the valve is internally chambered, and is provided with an inlet,
at one side near one end of the case, or at the bottom of the case. An outlet is
provided near the other end of the case, in which end is fitted a screw cap or plug,
giving access to the interior of the case.
About at its centre, the wall of the valve case chamber, is made tapering or inclined
preferably to an angle of about thirty-five degrees to form a seat, upon which close
three superposed check discs forming the valve, the said discs being separated by small
intervals. The stem of the first or smallest disc is solid and is fitted to slide in the stem
of the second or middle disc, which is. bored to receive it and the stem of which is
fitted to slide in the bored stem of the third or largest disc, which is provided with
longitudinal exterior ribs, which fit within the bore of the case cap, or plug, and guide
the check discs in the cap.
The operation of the valve it as follows:-
When water, steam or other fluid is admitted at the inlet, the first or lowermost disc
will open about one eighth of an inch, and then will strike the second or middle disc,
and raise it a like distance to the third or uppermost disc, which then will open for
any required distance to pass the fluid to the outlet. When the feed is shut off the
back pressure will be held by the third or uppermost disc, closing to the valve seat, and
the middle and lowermost discs also will seat themselves by gravity. Should the
uppermost disc happen to be held from a tight closure by dirt, grit, or other matter on
J

page_text: the disc or its seat, the middle disc will tightly close the valve, and should dirt or grit
also prevent a perfect seating of the middle disc, there is yet another chance of a tight
closure of the valve by the perfect seating of the lowermost disc, consequently a
practically perfect closure of this check valve may at all times be depended upon.
The opposing faces of the three discs are ground to fit closely to each other as the
valve opens, and whereby fluid will be excluded from the stems of the discs to prevent
their corrosion.
The number of valve discs is not limited to three, as two discs or more than three
may be used.
'
When ordinary check valves having a single disc or flap plate do not close tightly
owing to extraneous matter on the valve disc or plate and its seat, a current of fluid
particularly steam passing through the valve will quickly wear grooves in the valve
disc or plate or its seat, and make a regrinding or refitting of the valve necessary, and
when check valves of this last named class are fitted in pipes for feeding steam boilers
and do not close tightly, the back pressure of hot water leaking past them overheats
an injector or inspirator used to feed the boiler and renders it inoperative or seriously
impairs its effective action so that the feed of water to the boiler is irregular and
unsatisfactory, thereby giving much trouble to enginemen, particularly the engineers of
locomotive engines, hence my improved triple check valve is especially adapted for use
in pipe connections through which boiler feed water is forced by an injector or
inspirator.
It is evident that if the uppermost disc or both the upper and middle discs should
fail to close tightly and the middle or the lowermost disc should so close, there can be
no fluid current through the valve, hence the partially unseated discs and their place
of seating in the valve case will not be worn as in the ordinary check valve and the
next time fluid is allowed to pass through the valve, the extraneous matter which had
lodged on the discs or seat will be washed through, and will allow the valve to close
tightly again by the seating of the upper disc.
This feature of the valve is important as it not only assures a tight closure of the
valve, but promotes its durability and makes repairs or refitting of the valve necessary
only after very long use of the valve.
A. D. GLACE.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.

page_text: I, ADAM DAVIS GLACE of Rocklin, in the County of Placer, and State of California,
United States of America, Machinist, 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:-
My Invention relates to valves adapted to check the back flow or pressure of fluids;
and has for its object to provide a simple inexpensive valve of this character which
will close positively to cut off a back pressure or current of fluid, thereby promoting
the durability of the valve and avoid an overheating of an injector or inspirator
employed to force water through the valve, as when feeding steam boilers and
preventing waste of any fluid passed through the valve.
The Invention consists in certain novel features of construction and combinations of
parts of the check valve, all as hereinafter fully described and claimed.
Reference is to be had to the accompanying drawings forming a part of this
specification, in which figure 1 is a vertical sectional elevation of my improved check
valve. Figure 2 is a vertical section of the valve, taken at right angles to figure 1.
Figure 3 is a vertical sectional elevation of the triple discs separated from each other,
and figure 4 is a cross section through the stem of the upper disc of the valve. Similar
letters of reference indicate corresponding parts in all the figures.
The body or case A of the valve is internally chambered at B and is provided with
an inlet C shewn at one side near one end of the case but which may be at the bottom
of the case.
An outlet D is provided near the other end of the case in which end is
fitted a screw cap or plug E giving access to the interior of the case.
Suitable pipes
cd are fitted respectively to the inlet and outlet CD, as in figures 1 and 2. About at
its centre, the wall of the valve case chamber B is made tapering or inclined preferably
to an angle of about 35° to form a seat upon which close the three check discs
F, G, H of the valve. The bored stem of the disc F is provided with longitudinally
ranging exterior ribs f-four ribs being shewn-which fit within a bore e of the case
cap or plug E and guide the check discs in the cap. The bored stem g of disc G is
fitted in the bore of the stem of disc F, and the solid stem h of disc H is fitted in
the bore g of the stem of the disc G, all as most clearly shewn in figure 2 of the
drawings.
;-
The operation of the valve is as follows When water, steam, or other fluid is
admitted at the inlet C the valve disc H will open about 1-8th of an inch and then
will strike the disc G and raise it a like distance to the disc F which will then
open
for any required distance to pass the fluid to the outlet at D whence it escapes. When
the feed is shut off, the back pressure will be held by the disc F closing to the valve
seat b, and the discs G and H also will seat themselves by gravity. Should the disc F
happen to be held from a tight closure by dirt, grit, or other matter on the disc or
its seat, the disc G will tightly close the valve, and should dirt or grit also prevent a
perfect seating of the disc G, there is yet another chance of a tight closure of the valve
by the perfect seating of the disc H, consequently a practically perfect closure of this
check valve may at all times be depended upon. The opposing faces of the discs
F, G, H, are ground to fit closely to each other as the valve opens, and whereby fluid
will be excluded from the stems of the discs to prevent their corrosion. The number

page_text: of valve discs is not limited to three, as shewn, as two discs or more than three may
be used.
When ordinary check valves having a single disc or flap plate do not close tightly,
owing to extraneous matter on the valve disc, or plate and its seat, a current of fluid,
particularly steam, passing through the valve will quickly wear grooves in the valve
disc or plate or its seat and make a regrinding or refitting of the valve necessary, and
when check valves of this last named class are fitted in pipes for feeding steam boilers
and do not close tightly, the back pressure of hot water leaking past them overheats an
injector or inspirator used to feed the boiler and renders it inoperative or seriously
impairs its effective action so that the feed of water to the boiler is irregular and
unsatisfactory, thereby giving much trouble to engine-men particularly the engineers
of locomotive engines; hence my improved triple check valve is especially adapted for
use in pipe connections through which boiler-feed water is forced by an injector or
inspirator.
It is evident, that if the disc F, or both discs F, G, should fail to close tightly and
the disc G or H should so close, there can be no fluid current through the valve, hence
the partially unseated dises and their place of seating in the valve case will not be
worn as in the ordinary check valve, and the next time fluid is allowed to pass through
the valve the extraneous matter which had lodged on the discs or seat will be washed
through and will allow the valve to close tightly again by the seating of the disc F.
This feature of the valve is important, as it not only assures a tight closure of the valve,
but promotes its durability, and makes repairs or refitting of the valve necessary only
after very long use of the valve.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1. A check valve, made with a chambered case provided with an inlet and an outlet,
a tapering scat arranged between the inlet and outlet, and two or more valve discs
guided in the case and adapted to the tapering seat thereof, substantially as described,
for the purposes set forth.
2. A check valve, made with a chambered case provided with an inlet and an outlet, a
tapering seat arranged between the inlet and outlet, a recessed removable cap or plug
fitted to the case, and two or more valve discs one having a hollow stem fitted to slide
in the cap, and the stems of the valve discs fitting loosely into each other, and said
dises adapted to the tapering seat of the valve case, substantially as described for the
purposes set forth.
3. The combination, in a check valve, of a chamber case A provided with a tapering
seat b, an inlet C, and an outlet D a removable cap E recessed at e, a disc F having a
hollow stem provided with ribs f¹ and fitted in the cap recess e, and an auxiliary disc,
as at G, fitted by its stem g in the stem of disc F, said dises F, G, adapted to the
tapering seat 6 of the valve case, substantially as described, for the purposes set forth.
4. The combination, in a check valve, of a chambered case A provided with a
tapering seat b, an inlet C, and an outlet Da removable cap E recessed at e a disc F
having a hollow stem f provided with ribs and fitted in the cap recess e, a disc G
having a hollow stem g fitted in the stem of disc F, and a disc H having a stem h
fitted in the stem y of the disc G, and said dises F, G, H, adapted to the tapering
seat 6 of the valve case, substantially as described, for the purposes set forth.