Classifications

• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
  • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
  • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
  • E03C1/28—Odour seals
  • E03C1/298—Odour seals consisting only of non-return valve
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K15/00—Check valves
  • F16K15/14—Check valves with flexible valve members
  • F16K15/148—Check valves with flexible valve members the closure elements being fixed in their centre
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
  • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
  • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
  • E03C1/22—Outlet devices mounted in basins, baths, or sinks
• • E—FIXED CONSTRUCTIONS
  • E03—WATER SUPPLY; SEWERAGE
  • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
  • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
  • E03C1/12—Plumbing installations for waste water; Basins or fountains connected thereto; Sinks
  • E03C1/28—Odour seals
  • E03C1/284—Odour seals having U-shaped trap
  • E03C1/288—Odour seals having U-shaped trap having non-return valves against return of waste water

Definitions

• This invention relates to the field of waste outlet fittings, in particular to such fittings normally used with sinks, hand basins, shower trays, baths, bidets and the like, which for convenience are commonly referred to herein as "basins".
• Known waste outlet fittings comprise a flange which is located within the bowl of the basin and defines a seat for co-operation with a plug to close the outlet.
• the plug is incorporated in the fitting which also includes means for raising and lowering the plug, such fittings being known as "pop-up waste” fittings.
• the fittings comprise externally threaded tubular parts for connection to further pipework leading to the drains.
• the water trap often in the form of a ⁇ bend, is generally connected to the waste outlet by a threaded connection.
• the water trapped in the bend acts as a seal to prevent the flow of gases, but flow of soiled water through the trap is substantially unimpeded.
• the need for a water trap is often inconvenient, especially where space is restricted. Thus, shower trays must frequently be raised to accommodate the traps beneath them.
• water traps are not normally easily accessible for maintenance, e.g. to unblock the trap should it become blocked, which is apt to occur from time-to-time. Such operations are especially inconvenient and costly when a trap is concealed by tiling or other permanent fixtures.
• a waste outlet fitting comprising a generally tubular body and a discharge channel extending through the body, characterised in that a support member is mounted within the body, and a diaphragm carried on the support member defines a skirt flaring outwardly in the downstream direction and having a free peripheral edge for sealing engagement with the wall of the channel thereby to form a valve to prevent reverse flow of fluid through the channel.
• the diaphragm acts as a valve member which co-operates with the channel wall to define a check valve which allows essentially unrestricted flow of waste water out through the fitting but which prevents flow of gases in the reverse direction.
• the diaphragm can be accommodated within a waste fitting without having to increase significantly the length of the body, and as the diaphragm valve obviates the need for a water trap a substantial space saving is achieved.
• a waste outlet fitting with such a valve has the further advantage that it can preclude the need for a separate air admittance valve for allowing air to enter a stack pipe.
• the diaphragm is accessible, and in particular can be removed from the fitting through the inlet or upstream end of the body, whereby maintenance operations are simplified as the valve can be reached from within the basin.
• the diaphragm support member is fixed to a cylinder which has a sliding fit in the tubular body and defines the channel wall portion against which the skirt seals.
• the diaphragm, support member and cylinder can be preasse bled to be inserted and subsequently removed from, the tubular body as a unit, to facilitate manufacture and maintenance.
• the elastomeric skirt is substantially conical and inclined at an angle not greater than about 60° to the axis of the tubular body. Tests have shown good results are obtained with an angle in the range of 20° to 60°, more particularly 30° to 40°.
• the diaphragm may also be provided with support ribs on the underside of the skirt to enhance its stiffness or resilience and/or with annulated ribs on the upper face of the skirt to enhance the seal with the inner wall of the channel.
• the skirt may have a dome-shape so that the channel wall is substantially tangential to the skirt at the sealing location.
• the channel wall against which the diaphragm seals is lined with a material with which the diaphragm has an enhanced sealing affinity.
• the channel wall may be coated with an appropriate sealing material, such as PTFE, or a sleeve of elastomeric material may be fitted within the channel wall.
• an appropriate sealing material such as PTFE
• a sleeve of elastomeric material may be fitted within the channel wall.
• the diaphragm can be clamped to the support member, such as by a screw and washer engaged with the support, but in a preferred embodiment an inner edge of the diaphragm is engaged in a groove provided in the support member to secure the diaphragm in place.
• Fig. 1 is an axial section through a fitting in accordance with the invention
• Fig. 2 is an axial section through another fitting in accordance with the invention.
• Fig. 3 is an axial section through a pop-Up waste fitting embodying the invention.
• Fig. 4 is an enlarged view of the detail A in Figure 2.
• the waste outlet fitting 1 as shown in Figure 1 comprises a generally tubular body 2 which defines a discharge channel, a strainer 3, a support member 4 in the form of an axial stem integral with the strainer 3, and a diaphragm 6.
• the tubular body 2 has a flange 8 at its upper end forming a seat for cooperation with a standard plug and adapted to extend around the outlet orifice of a basin, or the like, in conventional manner.
• the external surface of the body 2 is provided with a screwthread 10 for connection to pipework which connects the outlet fitting to the drains.
• An aperture 5 is formed in the body for connection with an overflow of the basin, as well known in the art.
• the strainer 3 is detachably mounted in the body 2 a short distance below the flange by a bayonet type connection which allows quick release of the strainer, although screw or snap fit connections may be used, or a combination of all three.
• the bayonet connection comprises projections 7 within the body and segments on the underside of the strainer with grooves for engagement with the projections to allow the strainer to be locked in place and released for removal through the upper end of the body by rotation of the strainer through a small angle.
• the stem 4 projects axially downwards from a central hub 9 of the strainer and at its lower end carries the diaphragm 6.
• the diaphragm 6 is made of elastomeric material and is substantially conical in shape. It has a central aperture, the edge of which is engaged in a peripheral groove formed in the stem near its lower end.
• the skirt of the diaphragm is inclined and meets the inner wall of the tubular body at an angle of 10°-40°. With the outer edge of the diaphragm being curved and upon the skirt being deformed slightly upon insertion into the body 2, the angle of contact may be very small.
• the free edge 12 of the skirt bears against the inner wall 13 of the tubular body 2 under light pressure due to its own resilience for normally closing off the discharge channel.
• the strainer 3, stem 4 and diaphragm 6 form a sub-assembly for insertion into and removal from the fitting body 2.
• FIG. 2 An alternative embodiment of the invention is shown in Figure 2, in which the same reference numerals have been used to designate corresponding parts to those appearing in Figure 1.
• the upper end of the tubular body (2) is counterbored and receives a cylinder 25 with which the strainer 3 and support stem 4 are integral, the discharge channel being defined within the cylinder which defines the channel wall against which the peripheral sealing edge of the diaphragm bears.
• a sleeve 23 of elastomeric material is set into the lower end of the cylinder 25 to line the channel wall portion against which the skirt of the diaphragm 6 bears.
• the inner surface of the cylinder may be coated with a sealing material such as PTFE.
• the diaphragm 6 is provided with an annulated rib 26 which contacts and seals against the sleeve 23.
• the lower end of the cylinder 25 is sealed to the upwardly facing shoulder 22 of the tubular body 2 by means of an out-turned flange portion of the sealing sleeve 23.
• the cylinder 25, support stem 4, diaphragm 6 and sealing sleeve 23 are pre-assembled for insertion into, and subsequent removal from, the tubular body 2 as a unit.
• This unit or cartridge is held in place by a spring ring 24 received in a circumferential groove 27 in the cylinder 25 and adapted to engage with a snap action in an annular groove formed in the tubular body.
• valve defined by the diaphragm in the fitting of Fig. 2 operates in the same way as described above for the Figure 1 embodiment.
• Figure 3 shows the modified version of the fitting of Fig. 2 and intended for a waste outlet of the kind having a pop-up plug.
• the stem 4 has an axial bore 15. Located inside the bore 15 is the stem 16 of the plug member 14, and the upper end of an actuator rod 17. The rod 17 can be raised and lowered for operating the plug by any known mechanism.
• the actuator rod is sealed to the stem by an '0' ring 21 which surrounds the rod within the bore 15, but other seal arrangements are possible.
• the diaphragm is fitted onto the stem 4 in the same manner as that in the embodiment of Figure 1. Above the diaphragm the stem 4 has a radial hole 18 out through which any water passing down through the bore 15 can escape to the main channel around the stem 4.
• the diaphragm 6 defines a check valve which functions in the same way as in the embodiments of Figure 1 and 2. Gases are prevented from passing upwardly through the fitting by the diaphragm, by the • 0' ring 21 and by the seal provided by sleeve 23 between the cylinder 25 and the tubular body.
• valve maintenance is easy.
• the strainer is released and the sub-assembly of strainer, support stem and diaphragm can be withdrawn axially out of the body from within the basin.
• the cartridge is withdrawn as a unit allowing easy replacement of the diaphragm 6 and/or sleeve 23.
• the plug must be lifted out first, and it may be necessary to disconnect the actuating rod from its operating mechanism.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Health & Medical Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Public Health (AREA)
• Water Supply & Treatment (AREA)
• Mechanical Engineering (AREA)
• Self-Closing Valves And Venting Or Aerating Valves (AREA)
• Quick-Acting Or Multi-Walled Pipe Joints (AREA)
• Safety Valves (AREA)
• Processing Of Solid Wastes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=10690373

Family Applications (1)

Country Status (5)

Families Citing this family (25)

Family Cites Families (7)

• 1991
  • 1991-02-21 GB GB919103681A patent/GB9103681D0/en active Pending
• 1992
  • 1992-02-20 AU AU12588/92A patent/AU653990B2/en not_active Ceased
  • 1992-02-20 WO PCT/GB1992/000297 patent/WO1992014888A1/en not_active Ceased
  • 1992-02-20 EP EP92904882A patent/EP0572468A1/de not_active Ceased
  • 1992-02-20 CA CA002104235A patent/CA2104235A1/en not_active Abandoned
• 1993
  • 1993-08-10 GB GB9316588A patent/GB2268055B/en not_active Expired - Fee Related

Non-Patent Citations (1)

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