FIELD OF INVENTION:

This invention relates to plunger type inlet valve for cisterns. The invention further relates to an offset adjustable float stem and a locking means provided on the said adjustable float stem for setting the desired water level

BACK GROUND:

The inlet valves for toilet cisterns are controlled by a water level sensing device usually a float, and it is well known that a float is provided at the end of an arm pivoted to the valve housing, the other end of the arm pressing on a small plunger having a sealing washer pad to press against the valve seat.

Also cistern inlet valves are known having a float slideable on the valve column connected to the inlet to the cistern, there being a small lever arm connecting the float to a valve member to close on a valve seat at the upper end of the column.

In all toilet cistern inlet valves it is desirable that the valve permit the reasonably rapid filling of the cistern, but at the same time be quiet in operation so that the noise produced by the rapid filling of the cistern is minimal. However to rapidly fill the cistern, the valve must be open to an extent to permit a large flow of water. In areas where the water supply is provided at high pressure, the valve must close off at a reasonably rapid rate, but should not be at a rate to produce a rebound shock wave to proceed back through the water supply line, in other words to produce water hammer. Thus it is desirable that there should be a reasonably soft closing of the valve without any likelihood of water hammer, irrespective of the water supply pressure.

The existing Inlet Valves are of two types namely conventional valves with long levers and ball or Equilibrium float valves designed to function on pressure equalization principle. These suffer from the following drawbacks.

(a) The conventional Inlet valve cannot fit into narrow profile cisterns, which are now being manufactured to conserve space in the Bathrooms

(b) The conventional Inlet valves do not have the requisite flexibility to set the desired water level.

(c) The Inlet Valves malfunction if the water being used is from bore-well or contains high content of salts, minerals and impurities. Due to malfunctioning, there is continuous leakage leading to wastage of water, which has become a very precious commodity.

(d) Existing valves cannot withstand high pressure and hence are not suitable for installation in the High Rise Buildings.

(e) Existing inlet valves with float design (stem at center) are not suitable to fit in to the cisterns, where the mounting hole of the cistern is very near to the cistern wall.

To obviate the above drawbacks, a plastic plunger type side inlet valve for cistern is invented. According to this invention, plastic plunger type side inlet valve comprising of: a inlet body having plunger sliding inside the front cap assembled at the front,said inlet body has a housing at the bottom to accommodate a plunger and a lever to actuate the said plunger, the said lever is connected to said float with an adjustable float stem (integral part of the float) for setting the desired water level in the cistern,the said inlet body is connected to the said lever with a split pin, the said inlet body and said front cap are connected and locked with a screw ring

The present invention further relates to afloat which is provided with adjustable float stem at center or at an offset, depending upon the profile of the cistern in which it is to be used.

The present invention further relates to a locking means, which is provided on the said adjustable float stem for setting the desired water level.

OBJECT OF THE INVENTION:

The object of the invention is to provide an effective, trouble free means of filling water in the cistern, which will function excellently in all conditions prevailing in India viz. high rise building, water full of impurities and even low line pressures. It is simple to operate and maintain.

Another object of the invention is to provide an offset adjustable float stem which has an advantage over a adjustable float stem at center, since it can fit into a very narrow profile cistern.The plunge*type side inlet valve will be suitable for all those cisterns with a minimum distance of the inlet valve mounting hole from the cistern wall & also where the out flow valve position is closer to the inlet valve. (Refer Figure 5).
Yet another objective of the invention is to provide an offset adjustable float During production of cistern, there is always a shrinkage up to 7% caused due to the process itself, where in the same model of cistern produced from the same mould will have excess shrinkage. The back side wall of the cistern, due to shrinkage will have a deformation / sagging towards inside touching the normal center positioned float.

SUMMARY OF THE INVENTION:

A plastic plunger type side inlet valve comprising :a inlet body having plunger sliding inside the front cap assembled at the front, said inlet body has a housing at the bottom to accommodate a plunger and a lever to actuate the said plunger, the said lever is connected to said float with an adjustable float stem (integral part of the float) for setting the desired water level in the cistern, the said inlet body is connected to the said lever with a split pin,the said inlet body and said front cap are connected and locked with a screw ring

BRIEF DESCRIPTION OF THE INVENTION:

The invention will now be described with reference to the accompanying drawings:

Figure 1 shows perspective view of the plunger type side inlet valve for the cistern , according to this invention.

Figure 2 shows the exploded view of said plunger type side inlet valve.

Figures 3 & 4 shows the plunger type side inlet valve with adjustable float stem at the center and offset positions.

Figure 5 shows the top view of the cistern highlighting the features of an offset float stem design.

DETAILED DESCRIPTION OF THE INVENTION:

Referring to the drawings (2) shows the front cap connected to the inlet body (1) through a screw ring (5). A plunger (3) slides inside front cap (2). Top (6.1) of said float (6) is attached to the Lever (4). The said adjustable float stem (6.1) has locking means (LM) for setting the desired level of water.

A lever (4) is attached to the front cap (2) for actuating the plunger (3) inside the inlet body housing, split pin (7) connects the lever (4) to front cap (2) at one end and the other end of the lever is connected to adjustable float stem (6.1). Diaphragm (8) is fitted on plunger (3) and is accommodated in the front cap & inlet body housing. Inlet body (1) has a nozzle for flow of water. The said Inlet body (1) is connected to front cap (2) by screw ring (5). Rubber washers (9) and back nut (10) are accommodated in lower end of the inlet body (1) for preventing the out-flow of water from the cistern. Position of adjustable float stem (6.1) sets the desired level of water in the cistern (not shown). Different position of adjustable float stem viz. Center & offset of float are shown in figures 3 & 4 respectively.

Working:

The water from the source enters through inlet body (1) into the cistern (not shown). When the level of water reaches the desired level, it pushes up the float (6), which in turn pulls up the lever (4). When the float (6) is at the desired water level position as set on the adjustable float stem (6.1), the plunger (3) slides down and closes the nozzle of the inlet body (1) there by blocking the entry of water. This is the closed state of the inlet valve.

When the flush system inside the cistern is operated the filled water gets discharged through the out flow valve (not shown) into the closet.

As the water level in the cistern (not shown) drops, the float (6) slides down the plunger (3) away from the nozzle of the inlet body (1) pushing down the lever (4), and thereby allows the water to flow through inlet body nozzle (1) into said cistern till the set level of water. The above invention is explained herein by way of an example. The example is by no means limiting.

Advantages:
The plunger type side inlet valve provides an effective, trouble free means of filling water in the cistern, it will function excellently in all conditions prevailing in India viz. high rise building, water full of impurities and also low line pressures. It is simple to operate and maintain.

The special feature of having a offset adjustable float stem will have an advantage over a adjustable float stem at center, since it can fit into a very narrow profile cistern.

The plunger type side inlet valve will be suitable for all those cisterns with a minimum distance of the inlet valve mounting hole from the cistern wall & also where the out flow valve position is closer to the inlet valve. (Refer Figure 5).

Another advantage of using a offset adjustable float stem is, during production of cistern, there is always a shrinkage up to 7% caused due to the process itself, where in the same model of cistern produced from the same mould will have excess shrinkage. The back side wall of the cistern, due to shrinkage will have a deformation / sagging towards inside touching the normal center positioned float. The same can be over come by using a offset adjustable float stem which makes it's assembly easy with out any fitment issue.

We claim:

1. A plastic plunger type side inlet valve comprising :

a inlet body having plunger, sliding inside the front cap assembled at the front,

said inlet body has a housing at the bottom to accommodate a plunger and a lever to actuate the said plunger,

the said lever is connected to said float with an adjustable float stem (integral part of the float) for setting the desired water level in the cistern, the said inlet body is connected to the said lever with a split pin,
the said inlet body and said front cap are connected and locked with a screw ring

2. A plastic plunger type side inlet valve as claimed in claim 1, wherein said adjustable float stem position may be at center or at an offset depending upon the profile of the cistern in which it is to be used.

3. A plastic plunger type side inlet valve as explained in claim 1, where in a locking means is provided on the said adjustable float stem for setting the water level.

4. A plastic plunger type inlet valve substantially described as herein with reference to and as illustrated in the accompanying drawings.