IMPROVEMENTS IN FLAP OR CHECK VALVES FOR TIDAL AND OTHER PURPOSES
Year: 1884

page_text: I, FRANCIS GOOLD MORONY STONEY, of 4 Westminster Chambers, Victoria
Street, London, Civil Engineer, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN FLAP OR CHECK VALVES FOR TIDAL AND OTHER PURPOSES
to be as follows:-
My said Invention has for its object to construct flap or check valves for tidal
and other purposes in an improved manner, and so as to open fully with very small
power, and either so as to be balanced in all positions, or so as to be partly balanced,
or so as to be differently balanced in different positions.
My improved valve consists of a disk or plate of any convenient form arranged
to close and fit against a suitable seating and in opening it turns about an axis or
fulcrum at its upper part; but instead of its fulcrum being formed by fixed centre
pins or an ordinary hinge, the valve is fixed to one or more rollers arranged to run
on short tracks or rails formed or fixed on the top of the casing on which the seat
is formed. When the valve turns in opening, its carrying rollers roll back along
their tracks and with this motion the valve becomes lifted out of the current flowing
through the opening, to an extent depending on the diameter of the rollers. In one
modification the valve is balanced by means of levers extending from the rollers
oppositely to the levers by which the valve is attached to the rollers and fitted
with a suitable counterweight; but where there is not room for such counter-
weighted levers to work, the rollers may be geared to upper rollers to which are
fixed levers carrying a counterweight, such levers moving in the space above that
in which the valve moves when open. The rollers may be kept from getting out
of their proper positions by means of teeth formed on them and gearing into rack
teeth in the tracks; or a chain may be passed round a suitably grooved part of
each roller and have its ends fixed at opposite ends of the track, such chain holding
down the roller and restraining it from sliding without hindering its rolling motion.
If it is desired to hold the valve with a slight pressure when closed, a weight
may be applied by means of a lever or levers so as to project out horizontally from
the axis of the valve when the valve is in a closed position, and an adjustable
weight so applied will act with diminishing leverage as the valve opens.
EDMUND HUNT,
Applicant's Agent.

page_text: COMPLEID
DIECIFICATION,
"
I, FRANCIS GOOLD MORONY STONEY, of 4 Westminster Chambers, Victoria
Street, London, Civil Engineer, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN FLAP OR CHECK VALVES FOR TIDAL AND OTHER PURPOSES
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement that is to say:-
My said Invention has for its object to construct flap or check valves for tidal
and other purposes in an improved manner, and so as to open fully with very small
power, and either so as to be balanced in all positions, or so as to be partly balanced,
or so as to be differently balanced in different positions.
My improved valve consists of a disk or plate of any convenient form, arranged
to close and fit against a suitable seating; and in opening it turns about an axis or
fulcrum at its upper part; but instead of its fulcrum being formed by fixed centre
pins or an ordinary hinge, the valve is fixed or connected to one or more rollers
arranged to run on short tracks or rails. When the valve, turns in opening, its
carrying rollers roll back along their tracks, and with this motion the valve becomes
partly lifted out of the current flowing through the opening to an extent depending
on the diameter of the rollers.
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings to
be hereinafter referred to and representing flap or check valves as constructed with
my improvements together with modifications of details.
Figures, 1, and 2, are front and side elevations of a modification in which the
valve, V, is represented as of a circular form and as closing against a vertical seat, S,
formed on a cylindrical casting, P, which may be fixed at the discharge end of a
line of pipes, or of a culvert or drain. The valve, V, is fixed to and carried by
two levers, L, which have also fixed to, each of them a roller, R, arranged to rest
and roll on a track, or horizontal path, T, formed on a casting bolted to the
casting, P. The levers, L, extend beyond the rollers, R, and have a weight, W,
fixed to them to counterbalance inore or less of the weight of the valve, V. The
rollers, R may be prevented from getting out of their proper positions on the
tracks, T, either by means of pinion teeth formed on the rollers and gearing with
rack teeth formed on the tracks, or by means of appliances shown in figures, 1,
and 2. Each roller, R, has fixed to it by means of a screw stud, A, a crosshead, C,
in which are fixed staples, B, for the attachment of the two ends of a chain passing
partly round the roller, R, and round the track piece, T. Each roller, R, is made
with two grooves in a part at the outer side of the part which bears on the track, T,
similar grooves being made in the track piece, and the chain passes from the upper
staple, B, partly round the roller in one groove next round the track piece, T, in
passing under which it crosses to the position of the other groove, and finally
reaches the lower staple, B, in a position to apply itself to the other groove of the
roller when the roller rolls back. The staples, B, are adjustable in the crosshead, C.
When it is wished to have some pressure tending to keep the valve, V, closed, this

page_text: inay be applied by means of small weights, D, fixed on the studs, A, which project
at right angles from the vertical plane passing through the valve and its counter-
weight, W; and the leverage of weights, D, applied in this way decreases as the
valve opens.
When it is not convenient to have a space immediately above the valve for the
counterweight, W, to turn over into when the valve, V, opens, the counterbalancing
can be arranged in the manner indicated in figures, 3, and 4. In this modification
the rollers, R, fixed to the levers, L, which carry the valve, are formed with pinion
teeth gearing with rack teeth formed on the track piece, T. These pinion teeth of
the rollers, R, also gear with pinion teeth formed on upper rollers, r, which pinion
teeth also gear with rack teeth formed on an upper inverted track piece, t. The
upper rollers, r, are in contact with the lower rollers, R, and with the upper inverted
track, t, and they have fixed to them levers, l, to which the counterweight, W, (not
shown) is to be fixed. When the valve and its levers, L, are in a vertical position
the upper levers, l, are also in a vertical position as shown in figure, 3; but when
the valve opens and the lower ends of its levers, L, turn outwards (to the left) then
in consequence of the roller pinions gearing together as described the upper ends
of the upper levers, l, with the counterweight also turn outwards.
In a modification shown in vertical section in figure, 5, the levers, L, instead of
being directly fixed to the valve, V, are connected to it by parallel links, E, an
arrangement which allows of the levers, L, with their rollers, R, and the counter-
weight, W, being placed at any convenient distance above the valve, the links, E
being made of a length to suit such distance. Figure, 5, also shows convenient
arrangements which may be adopted when it is desired to have the power of
altering the position of action of the counterweight, W, either longitudinally or
transversely in relation to the levers, L. The counterweight, W, is represented as
suspended by links, G, of which there is one for each of the two levers, L, each
link being jointed to a block, H, working in a transverse guide slot in a shoe, J,
fitted to the end of the lever. For longitudinal adjustment holes are provided in
the shoe, J, and also in the end of the lever, L; and pins can be inserted through
any of the former holes and through the latter. For transverse adjustment the
block, H, is movable in 'the slot in the shoe, J, by means of a screw spindle, K,
tapped through the block and held by its ends in the shoe.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed I declare that what
I claim is
In a flap or check valve for tidal or other purposes, the combination of the rolling
fulcrum and support with the counterweighted lever or levers, substantially as
hereinbefore described.
EDMUND HUNT,
Applicant's Agent.