Pipe joints or couplings – Packed – Wedge
Patent
1998-02-09
1999-10-05
Arola, Dave W.
Pipe joints or couplings
Packed
Wedge
285354, 2853827, 285906, 285915, F16L 1702
Patent
active
059611600
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a connection system for high-pressure screwed pipe joints having a standardized retention body with a 24.degree.-connection, a likewise standardized coupling ring for producing a high-pressure connection, a pipe or a connecting member for connecting other system components and a sealing ring which is sealed by means of an elastomer high-pressure seal relative to the retention body and relative to the pipe and which has a front surface which is immediately adjacent to a front surface of the retention body.
A connection system of this kind is known in the art from DE 40 38 539 C1.
In order to manufacture appropriate high-pressure connections, in particular for fluids in high-pressure conduits, purely metallic seals of the double-edged cutting ring type are primarily used in modern day screwed pipe joints in accordance with DIN 2353 which are nearly identical from a technical point of view. The double-edged cutting ring thereby performs both a sealing as well as a holding function for the corresponding connection system. Increased demands by users have recently, however, led to an increasing desire for additional elastomer seals. Simple sealing devices for cutting rings as e. g. described in DE 41 03 266 A1 or DE 80 17 944.8 U1 as well as in DE 42 29 502 A1 have not been commercially successful up to this point in time since either the handling or the necessary pipe preparation is too difficult or expensive for the system at hand.
The most recent prior art in cutting ring systems has a connection system having two-part rings in combination with a DIN retention body with a DIN coupling ring as, e. g. described in the above cited DE 40 38 539 C1. This conventional system advantageously separates the holding function and the sealing function. As already known in the art from older publications (see e. g. DE 27 12 614 A1) and, above all, proved in practical applications, a two-part ring, due to the separated clamping and resilient functions, has substantial advantages compared to a one-part ring having a double function. In principle, the system in accordance with DE 27 12 614 A1 is distinguished from the connection system according to the above cited DE 40 38 539 C1 only in that the first system does not utilize a DIN connector and has therefore not been commercially successful.
An even older pipe coupling system is known in the art from DT 15 25 666 C3 which is particularly used for gas applications and which was not capable of achieving an improved degree of sealing using an additional elastomer seal, since the purely metallic seal described therein already guaranteed the best possible degree of sealing even in Helium leak tests of the associated coupled pipes.
The connection system in accordance with DE 40 38 539 C1 had essentially taken adopted the partial solution already known in the art from previous publications (for the sealing element e. g. DE 90 03 299.3 U1; for the cutting ring and the cutting ring sided portion of the sealing element e. g. DE 27 12 614 A1 or DT 15 25 666 C3) and transformed same into a DIN compatible form. However, the conventional system still has serious disadvantages:
All conventional block-mounted cutting rings with which a front-sided abutment surface seats in a planar, play-free manner on the front surface of the retention body, lose flexibility due to the rigid frictional connection so that premature pipe breakage on the coupling ring side and even leakage on the screw threads of the retention body can occur. The conventional system of DE 40 38 539 C1 is also block-mounted in this fashion.
During assembly, one has the general problem that although the intended end of the assembly is visible when the coupling ring is loosened, one cannot, however, observe when the cutting ring has begun to cut into the pipe and whether or not the effective cut path is sufficient for effecting the entire holding force. The conventional coupling system does not allow for the additional cutting which might be necessary, e. g. in the event that t
REFERENCES:
patent: 2394351 (1946-02-01), Wurzburger
patent: 2585453 (1952-02-01), Gallagher et al.
patent: 2586453 (1952-02-01), Gallagher et al.
patent: 3248135 (1966-04-01), Meripol
patent: 3676573 (1972-07-01), Avery
patent: 4037864 (1977-07-01), Anderson et al.
patent: 4136897 (1979-01-01), Haluch
Olhydraulik und Pneumatik, vol. 37, No. 4, Apr. 1, 1993, pp. 308-311 Behrens, G.: "Dry Technology" in der fluidischen Verbindungstechnik.
"Wettstreit mit alten Techniken" in the journal "fluid-technid" Verlag moderne Industrie AG, D-86895 Landsberg. pp. 12,14,15 (Jul. 1995).
Company prospectus "EMB" of the company Eifeler Maschinenbau H Heinen GmbH & Co., D-53901 Bad Munstereifel, p. VII/1, 2 (1995).
Arola Dave W.
Vincent Paul
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