Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1998-09-24
2000-11-14
Nicholson, Eric K.
Pipe joints or couplings
Nonmetal to metal
Internal member
285256, 285382, F16L 3301, F16L 3318, F16L 3300
Patent
active
061458929
DESCRIPTION:
BRIEF SUMMARY
This invention concerns a connector for a press connection and a press connection produced with it.
Connectors made of plastic to produce a press connection are known, for example from CH 682 942 A5. The connector shown there is made of plastic and has peripheral areas onto which a pipe, especially a connecting pipe, is pressed. With the known connector, there is a rib within the peripheral area, in which a safety ring made of metal is held, which has sharp edges on the outside. This ring guarantees that even at high axial tensile loads, there is a safe, spring-actuated, snap-on connection between the connecting pipe and the connector. Since the basic body of the connector is made of plastic, there are no corrosion problems, which are known with connectors made of brass, for example. Polyolefin and crosslinked polyethylene are given as suitable plastics. This connector works relatively well, but its long-term behavior is not completely satisfactory, especially if there is a very sharp change in temperature. The metal safety ring also makes it expensive to produce.
It is therefore the problem of this invention to create a connector for a press connection and a press connection suitable for high pressure that are inexpensive to produce, that have a long life and that are reliable, even when there are sharp changes in temperature.
This problem is solved by the connector in and the press connection in according to the invention as outlined in the subsequent description, the drawings and the appended claims.
Surprisingly, it has been found that the plastic polyvinylidene fluoride (PVDF), which is described in R. Schneider and Th. Kohler "A Contribution to the Use of Plastic Pipe in Disposal Technology," gwf Wasser. Abwasser 134 (1993) No. 1, pages 25-33 as very suitable for certain special applications, but could not be used in the past for such pipe parts and fittings, because of its very good properties, such as pressure resistance, long-term stability and resistance to temperature changes, is well suited for a press connection, and due to its high surface quality, can also provide sufficient axial safety without an extra metal safety ring.
The connector made of PVDF meets all the hygiene requirements made under the Drinking Water Act. There are no corrosion problems, especially in connection with other metals.
The connecting pipe or pipes are pushed onto the connector, which has several ribs going around it in the peripheral area. There is also a sealing ring that goes around it and serves as an additional seal between the connector and the connecting pipe.
Preferably, the axial safety of the connecting pipe can also be ensured by sawtooth-shaped ribs on the connector. The ribs are then preferably arranged in two axial areas in a uniform orientation, and the orientation in both axial areas can be the same (tension safety alone) or opposite (pressure and safety). However, the sawtooth-shaped ribs with the sharp outer edge are preferably oriented in one direction so that the connecting pipe is secured against tension on the connector. It can be secured against pressure by a radial stop surface. Sealing rings can be found between ribbed areas or on the flange end of the connector.
In addition to ribbing in the peripheral area, there can be a step-shaped design in the peripheral area. The steps provide, first of all, axial safety and, secondly, a better seal. When pressed, they engage the connecting pipe more intensively with the connector.
The invention will be described below using an example of embodiment with a schematic drawing.
FIG. 1 shows a partially sectioned side view of a press connection with a connector, a connecting pipe and pliers and
FIG. 2 shows an enlarged view of the peripheral area of the connector in FIG. 1 intended for pressing the connecting pipe.
FIG. 1 shows a press connector 10 with a pipe-shaped connector 12, which has a peripheral area 14 which is intended for pressing a connecting pipe 16 on at least one free end. The connecting pipe 16 is generally made of an inner layer 18 of cross
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patent: 5044671 (1991-09-01), Chisnell et al.
patent: 5096231 (1992-03-01), Chisnell et al.
patent: 5378023 (1995-01-01), Olbrich
patent: 5388871 (1995-02-01), Saitoh
patent: 5833278 (1998-11-01), Riaanda et al.
Geberit Technik AG
Nicholson Eric K.
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