GB2164965A - Waste water trap - Google Patents

Abstract

A waste water trap comprises an outer cylinder in two parts, the upper part (1) forming the inlet and the lower part (2) containing an outlet pipe (5) connected to a drainage system using connector(6). Said outlet pipe (5) is surrounded by an inverted cup-like member (15) forming a float valve. Under normal pressure conditions, the member (15) is as shown in the figure allowing waste water to flow as indicated by the arrows. When there is a drop in pressure in the waste outlet, the member (15) drops to make contact with the base of part (2) thus sealing off the trap. If back- pressure from the drainage system occurs, the member (15) rises to make contact with gasket (8) and again seal off the trap. <IMAGE>

Description

SPECIFICATION Anti-back pressure, anti-siphon valve This is invention mlatesto an "anti-back pressure, anti-siphon valve.

Watertraps are an essential feature of any plumbing installation. Existing watertraps known as 'P'-traps and 'S'-traps retain water in a bend in a uniform length of pipe. However, these methods form perfect siphons, allowing the complete evacuation ofthe water seal, should suitable conditions occur, thus enabling unpleasant gases from within the plumbing to enterthe building via the trap forming an unhealthy environment. The effects of back pressure on simple 'S' and 'P'-traps will also produce an unpleasant atmosphere, the contents of the trap being forced back upthewaste outlet and into the sanitaryfitting.

Once the expulsion of the seal has taken place, the trap ceases to function and until the fitting is used again and the seal is replaced, there remains a source of irritabilityforthe building userwhich is potentially hazardous to the health.

According to the invention there is provided a device four inserting into a waste water outlet. An exteriorcylinderwith an inner dome capped unit motivated by water and air pressure.

Figure 1 shows in vertical section the valve in operation under normal pressure conditions. (The arrows 'B' indicate the direction of flow of the waste liquid. Arrows'A' indicate the direction of movement ofthe dome-topped cylinder 3, and the arrows 'C' indicate the downward movement ofthe collar 17 when unscrewed.

Figure 2 shows in vertical section the valve resisting the effects ofsiphoning.

Figure 3 shows in vertical section the valve resisting the effects of back pressure.

Figure4shows in inverted cutawaythedometopped cylinder3 displaying the four stiffening webs 15 and the anti-siphon gasket 14.

Figure 5 shows in horizontal section (section Y-Y, see fig. 2) the valve container wall 2, the dome-topped cylinder wall 3 and the waste outlet 5 in their relative positions.

Under normal pressure conditions, waste water descends through the cylindrical inlet4 (denoted by arrows), overthe dome-topped cap and down the sides ofthe cylindrical cover3 and then up the inside ofthe dome-topped cylinder 3 forcing itto rise as indicated by the arrows 'A' as shown on figure 1 .The waste liquid then continues down the waste outlet 5.

Whenthereisa drop in pressure inthewaste outlet 5, the water seal is prevented from being lost by suction as the dome-topped cylinder 3 adopts the position as shown in figure 2. If the valve experiences induced syphonage (due to a remote source), then the water seal will remain at rest and the water level 13 rnmaisundisturbedasth.e suction in the waste outlet Swfll hotie gaskettsh againstthe bottom of the removable section 2,thus eliminating any water seal movement The likelihood of the water seal being lost due to self siphonage is greatly reduced as the dome-topped cylinder3 rises up during use and regulates the flow of large heads ofwaste liquid reducing its speed on entering the drainage system and so reducing the probability of losing other unprotected water seals elsewhere in the system through induced siphonage.

(The velocity of smaller heads ofwater entering the system via the valve will remain about the same as that of water passing through a normal watertrap due to its inherently slower movement).

However, should the occasion arise whereby, through unusual circumstances, the water seal is removed from its usual place as indicated in figures 1 to 3, then the valve will continue to function correctly as a column ofthewaterseal will be retained in the waste outlet 5 as the dome-topped cylinderwith gasket 14 will be forced onto the base ofthe now evacuated removeable section by the atmospheric pressure, creating a new seal.The seal is returned to normal by using the appliance.

When the valve is experiencing back pressure, the dome-topped cylinder 3 is forced to rise upwardsto the back pressure gasket 8, as indicated in figure 3. The gasket8 is so arranged asto allowtheseal to become stronger as the pressure rises. The waste water seal is now prevented from rising up into the sanitary fitting via the inlet 4. Whilst in contact with the back pressure gasket 8, the dome-topped cylinder 3 eliminates the possibility of stench from waste water in the plumbing system percolating back up the inlet 4.

1. Awater (or other liquid) valve comprising an outer cylinder and an inner self-centring dome-topped cylinder which prevents loss ofthe seal through the effects of back pressure.

2. Thatthe device as claimed in Claim 1 will also eliminate the effects of self-siphonage.

3. Thatthe device as claimed in (2) and (1) will also prevent the effects of induced siphonage.

4. Thatthe arrangement of the device claimed in Claim 3 as shown in figure 1 will regulate the rate of flow from a large head of water (or other liquid).

5. That the device as claimed in Claim 4 prevents unclean orcontaminated water (or other liquid) from rising back into the sanitaryfitting.

6. That because of claims made in Claims 1,2,3,4 and 5, the device enables there to be a greater flexibility in planning the plumbing system.

7. That (the device as claimed in any preceeding claim with the inclusion of collar 17), it enables the removeable section 2 to be easilytaken out for inspection.

8. Thattheeasyremovalofpartwasmentioned in Claim 7 reveals the simplicity with which all surfaces ofthe device may be cleaned.

9. Thatthe complete device as claimed in all preceding claims, being on a vertical axis, it is easierto install and neater in appearance.

10. A demonstrable water (or other liquid) valve substantially as described herein with references to figures 1-5 ofthe accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (10)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Anti-back pressure, anti-siphon valve This is invention mlatesto an "anti-back pressure, anti-siphon valve. Watertraps are an essential feature of any plumbing installation. Existing watertraps known as 'P'-traps and 'S'-traps retain water in a bend in a uniform length of pipe. However, these methods form perfect siphons, allowing the complete evacuation ofthe water seal, should suitable conditions occur, thus enabling unpleasant gases from within the plumbing to enterthe building via the trap forming an unhealthy environment. The effects of back pressure on simple 'S' and 'P'-traps will also produce an unpleasant atmosphere, the contents of the trap being forced back upthewaste outlet and into the sanitaryfitting. Once the expulsion of the seal has taken place, the trap ceases to function and until the fitting is used again and the seal is replaced, there remains a source of irritabilityforthe building userwhich is potentially hazardous to the health. According to the invention there is provided a device four inserting into a waste water outlet. An exteriorcylinderwith an inner dome capped unit motivated by water and air pressure. Figure 1 shows in vertical section the valve in operation under normal pressure conditions. (The arrows 'B' indicate the direction of flow of the waste liquid. Arrows'A' indicate the direction of movement ofthe dome-topped cylinder 3, and the arrows 'C' indicate the downward movement ofthe collar 17 when unscrewed. Figure 2 shows in vertical section the valve resisting the effects ofsiphoning. Figure 3 shows in vertical section the valve resisting the effects of back pressure. Figure4shows in inverted cutawaythedometopped cylinder3 displaying the four stiffening webs 15 and the anti-siphon gasket 14. Figure 5 shows in horizontal section (section Y-Y, see fig. 2) the valve container wall 2, the dome-topped cylinder wall 3 and the waste outlet 5 in their relative positions. Under normal pressure conditions, waste water descends through the cylindrical inlet4 (denoted by arrows), overthe dome-topped cap and down the sides ofthe cylindrical cover3 and then up the inside ofthe dome-topped cylinder 3 forcing itto rise as indicated by the arrows 'A' as shown on figure 1 .The waste liquid then continues down the waste outlet 5. Whenthereisa drop in pressure inthewaste outlet 5, the water seal is prevented from being lost by suction as the dome-topped cylinder 3 adopts the position as shown in figure 2. If the valve experiences induced syphonage (due to a remote source), then the water seal will remain at rest and the water level 13 rnmaisundisturbedasth.e suction in the waste outlet Swfll hotie gaskettsh againstthe bottom of the removable section 2,thus eliminating any water seal movement The likelihood of the water seal being lost due to self siphonage is greatly reduced as the dome-topped cylinder3 rises up during use and regulates the flow of large heads ofwaste liquid reducing its speed on entering the drainage system and so reducing the probability of losing other unprotected water seals elsewhere in the system through induced siphonage. (The velocity of smaller heads ofwater entering the system via the valve will remain about the same as that of water passing through a normal watertrap due to its inherently slower movement). However, should the occasion arise whereby, through unusual circumstances, the water seal is removed from its usual place as indicated in figures 1 to 3, then the valve will continue to function correctly as a column ofthewaterseal will be retained in the waste outlet 5 as the dome-topped cylinderwith gasket 14 will be forced onto the base ofthe now evacuated removeable section by the atmospheric pressure, creating a new seal.The seal is returned to normal by using the appliance. When the valve is experiencing back pressure, the dome-topped cylinder 3 is forced to rise upwardsto the back pressure gasket 8, as indicated in figure 3. The gasket8 is so arranged asto allowtheseal to become stronger as the pressure rises. The waste water seal is now prevented from rising up into the sanitary fitting via the inlet 4. Whilst in contact with the back pressure gasket 8, the dome-topped cylinder 3 eliminates the possibility of stench from waste water in the plumbing system percolating back up the inlet 4. CLAIMS

1. Awater (or other liquid) valve comprising an outer cylinder and an inner self-centring dome-topped cylinder which prevents loss ofthe seal through the effects of back pressure.

2. Thatthe device as claimed in Claim 1 will also eliminate the effects of self-siphonage.

3. Thatthe device as claimed in (2) and (1) will also prevent the effects of induced siphonage.

4. Thatthe arrangement of the device claimed in Claim 3 as shown in figure 1 will regulate the rate of flow from a large head of water (or other liquid).

5. That the device as claimed in Claim 4 prevents unclean orcontaminated water (or other liquid) from rising back into the sanitaryfitting.

6. That because of claims made in Claims 1,2,3,4 and 5, the device enables there to be a greater flexibility in planning the plumbing system.

7. That (the device as claimed in any preceeding claim with the inclusion of collar 17), it enables the removeable section 2 to be easilytaken out for inspection.

8. Thattheeasyremovalofpartwasmentioned in Claim 7 reveals the simplicity with which all surfaces ofthe device may be cleaned.

9. Thatthe complete device as claimed in all preceding claims, being on a vertical axis, it is easierto install and neater in appearance.

10. A demonstrable water (or other liquid) valve substantially as described herein with references to figures 1-5 ofthe accompanying drawings.