A CDTS Flapper valve for a toilet tank
Field of the Invention
The present invention relates to a flapper valve, and more particularly to a CDTS
flapper valve for a toilet tank and having pneumatic actuators and airflow
controlling member to keep the flap in clean condition, odour blockage and adjust
the volume of flushing water of a toilet tank.
Description of Related Art
This invention pertains to a composite valve which may tend to save dispensed
water, and in a preferred adaptation, to a dual valve system for the reduction of
potable water consumed in flushing a tank top toilet. By this apparatus one may
selectively obtain partial and/or full flush. The partial flush insures against
avoidable contamination of valuable potable water.
The best known prior art of related systems consists of:
An US specification 4,138749 of Clark et al discloses a two-stage hydraulic flush
device for use in regulating the amount of water released when flushing a
conventional water closet. The flush handle of a conventional water closet is
actuated so as to unseat a drain plug in the water tank, and the piston of a
hydraulic cylinder which is submersibly disposed within the water tank is then
displaced to one of two distinct positions. As the piston is displaced, water is
admitted into the cylinder below the piston. When the flush handle is released,
water is expelled from the cylinder at a controlled rate as the piston is forcibly
returned by a spring mechanism to its initial position. As the piston returns, the
lifting arm is actuated so as to reseat the drain plug. The water outlet flow rate

determines the duration of the flushing action, and two distinct piston positions
define the two flush stages.
Another US specification 4,160,294 of Crumby et al discloses a two-stage toilet
flush mechanism is provided in which operation of the usual control lever to a
yieldable manually-felt detent point produces a partial flush the duration of which
is controlled by the position of first float with respect to the initial water level in the
storage tank, and movement of the lever beyond the detent point produces a
complete flush the duration of which is controlled by the position of a second float
with respect to the initial water level.
Yet another US specification 4,216,555 of Detzen et al discloses a dual flush
system tank adapted to provide either a full flush or a partial flush at the option of
the user. The control handle is actuated normally to produce a full flush. If a
partial flush is desired, the control handle is held in its depressed condition for
two or three seconds after which it is released. This produces a partial flush. A
partial flush is produced by a buoyant reseating weight which will float down with
the falling level of liquid in the tank to depress the flush ball and prematurely
reseat it in its outlet seat when only part of the liquid has been discharged from
the tank. The reseating weight is provided with a latch actuated by the flush
handle. For a full flush, the iatch is released but is immediately re-engaged
before the reseating weight moves downwardly in the tank and is hence latched
against premature seating of the flush bal. However, for a partial flush when the
flush lever is held down for a few seconds, the reseating weight floats down with
the falling level of the liquid in the tank until it is out of range of the latch, so as to
produce a partial flush.
Another US specification 4,135,263 of Anderson et al discloses an apparatus
operative to selectively discharge substantially all or only a predetermined portion
of the water within the flush tank of a toilet. The apparatus includes an open
ended float having selectively regulatable venting ports for controlling float weight

and buoyancy by the water-air ratio therein. The float is constructed in a size
adaptable to most existing commode flush tanks and is assembled therein by
attachment directly to the flush valve thereof. The float water-air ratio is then set
into the desired flush mode by selective venting of the ports whereby an
unweighted float will permit a full flush and a water filled float will drive the flush
valve into a premature closure for discharging only a portion of the water within
the flush tank.
The present invention is distinguished from the prior art in construction and result
as well be apparent from the ensuing specification, drawings and claims.
Conventional tank type flushing systems yield a full volume or full flush for both
solid and liquid waste disposal. Unfortunately, such systems needlessly
contaminate a tremendous quantity of potable water in septic and sewage
disposal. The coactive hydraulic and pneumatic valve system employed herein
will guarantee reduced water quantity consumed in operating a normal tank top
toilet. It is essentially a submerged, pneumatic water displacement system. The
user optionally herein controls the volume of water in one or two stages through
operating a tank top control crank lever. In the present dual flush system a partial
flush of less quantity and force is sufficient to remove liquid waste, per se, with a
saving of 1.425 gallons per flush. Alternately, a full flush, when selected may be
activated to remove both solid and liquid waste.
The apparatus herein can be readily installed in a conventional toilet tank,
inexpensively and without modification thereto.
SUMMARY OF THE INVENTION
The main objective of the invention is to provide a flapper valve for a toilet tank
and having a capability of minimizing the volume of flushing water of the toilet.
The flapper valve has a flange controlled by pneumatic actuator cylinder. The air

passage vents are provided to make air in the chamber be discharged through
the airflow controlling chamber.
Therefore such as herein described, there is provided a Controlled Discharge
Toilet System flapper valve for a toilet tank having an inlet and outlet with a top
opening, and the flapper valve comprising: a chamber / tank; an odour blocking
flap stabilized by a valve body and is being pivotally anchored to the base of the
chamber / tank; a pneumatic actuator cylinder operably connected with the odour
blocking flap at inlet position; a plurality of air passage vents positioned in the
flapper valve body.
One of the primary objectives of the present invention is to construct a simple
inexpensive attachment for a conventional toilet which will cause the
conventional toilet to operate in a manner to conserve water.
Another objective of the present invention is to provide a device which can be
quickly and easily attached onto the mechanism of a conventional toilet without
requiring the use of any special tools and also which can be attached by even an
unskilled individual.
Another objective of the present invention is to construct an attachment for a
conventional toilet which permits the toilet to be operated with pneumatic controls
by utilizing of the conventional flushing mechanism of the toilet in just a slightly
different manner.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth
above will become apparent when consideration is given to the following detailed
description thereof. Such description makes reference to the annexed drawings

wherein:
FIG. 1 is an exploded perspective view of the CDTS flapper valve in closed
condition in accordance with the present invention;
FIG. 2 is an exploded perspective view of the CDTS flapper valve in open
condition in accordance with the present invention.
DETAILED DESCRIPTION
Various embodiments of the present invention will be explained with reference to
the accompanying drawings.
With reference to FIGS. 1 and 2, a first embodiment of a CDTS flapper valve (10)
in accordance with the present invention for a toilet tank comprises an inlet (11),
a valve body (12), a dust protection cover (13), air passage vents (14), assembly
window (15), outlet (16) and an airflow controlling member (20). The toilet tank is
further provided with a pneumatic control system comprising of a pneumatic
actuator cylinder (19), a dust protection cover (17), a forked holder (18) and an
axial rod (20) for controlling the air passage vents (14 and 21).
The main valve (10) defines a chamber / tank lid position which is open ended at
top and bottom. The valve (10) i.e. also a odour blocking flap is stabilized by a
valve body (12) and is being pivotally anchored to the base of the tank as shown
in the figure. The bottom of the valve (10) is removably seated in sealable
relation to a bottom tank. The entire valve unit may be adapted to a conventional
system without substantial modification, excepting as the odour blocking flap is
actuated by a pneumatic actuator cylinder (19). Additional air passage vents (14)
are provided in the flapper valve body (12) to provide the circulation of air in the
valve so that the flap is always in a clean condition and wastes do not stick to it.
The pneumatic actuator cylinder (19) is operably connected to the axial rod (20)

with the help of a forked holder (18). The axial rod is (20) further operably
connected with the odour blocking flap (10) for the purpose of opening and
closing of the flap upon actuating the pneumatic actuator cylinder.(19) The whole
of the pneumatic control unit and the open ends of the axial rod are covered with
dust protection cover (17) for the maintenance free operations.
As discussed previously, after a person uses the toilet the wastes are deposited
on top of the odour blocking flap which remains in the closed condition. When the
person presses the flush button (not shown) after using the toilet, the pneumatic
actuator cylinder is actuated and the top odour blocking flap opens for some time
and the wastes fall down. The odour blocking flap is actuated by the pneumatic
actuator cylinder assembly which includes the forked holder and the axle rod and
opens the flap when it gets the pneumatic air supply from its controller valve in
the electronic control module (not shown). The air passage vents are provided in
the flapper valve body to provide the circulation of air in the valve so that the flap
is always in a clean condition and wastes do not stick to it. After the end of the
cycle the odour blocking flap closes again and the system is ready for its next
operation cycle.
Although the foregoing description of the present invention has been shown
and described with reference to particular embodiments and applications
thereof, it has been presented for purposes of illustration and description and is
not intended to be exhaustive or to limit the invention to the particular
embodiments and applications disclosed. It will be apparent to those having
ordinary skill in the art that a number of changes, modifications, variations, or
alterations to the invention as described herein may be made, none of which
depart from the spirit or scope of the present invention. The particular
embodiments and applications were chosen and described to provide the best
illustration of the principles of the invention and its practical application to
thereby enable one of ordinary skill in the art to utilize the invention in various

embodiments and with various modifications as are suited to the particular use
contemplated. All such changes, modifications, variations, and alterations
should therefore be seen as being within the scope of the present invention as
determined by the appended claims when interpreted in accordance with the
breadth to which they are fairly, legally, and equitably entitled.

We claim:-
1. A CDTS flapper valve for a toilet tank having an inlet and outlet with a top
opening, and the flapper valve comprising:
a chamber / tank;
an odour blocking flap stabilized by a valve body and is being pivotally anchored
to the base of the chamber / tank;
a pneumatic actuator cylinder operably connected with the odour blocking flap at
inlet position;
a plurality of air passage vents positioned in the flapper valve body.
2. The CDTS flapper valve as claimed in claim 1, wherein the valve 10 defines a
chamber / tank lid position which is open ended at top and bottom.
3. The CDTS flapper valve as claimed in claim 1, wherein the bottom of the valve
10 is removably seated in sealable relation to a bottom chamber / tank.
4. The CDTS flapper valve as claimed in claim 1, wherein pneumatic actuator
cylinder is operably connected to the axial rod with the help of a forked holder
and the axial rod is further operably connected with the odour blocking flap for
the purpose of opening and closing of the flap upon actuating the pneumatic
actuator cylinder.

5. The CDTS flapper valve as claimed in claim 1, wherein the complete
pneumatic control unit and the open ends of the axial rod are covered with dust
protection cover for the maintenance free operations.
6. The CDTS flapper valve as claimed in claim 1, wherein the plurality of air
passage vents are provided in the flapper valve body to provide the circulation of
air in the valve so that the flap is always in a clean condition and wastes do not
stick to it.

7. The CDTS flapper valve as claimed in claim 1, wherein the pneumatic actuator
cylinder opens the flap when it gets the pneumatic air supply from its controller
valve in the electronic control module.
8. The CDTS flapper valve as claimed in claim 1, wherein the pneumatic actuator
cylinder is activated by a flush switch / lever.
9. A CDTS flapper valve for a toilet tank having an inlet and outlet with a top
opening substantially as herein described with particular reference to
accompanying drawings.

A COTS flapper valve for a toilet tank having an inlet and outlet with a top
opening, and the flapper valve comprising: a chamber/tank; an odour blocking
flap stabilized by a valve body and is being pivotally anchored to the base of the
chamber/tank; a pneumatic actuator cylinder operably connected with the odour
blocking flap at inlet position; a plurality of air passage vents positioned in the
flapper valve body.