GB2219834A

GB2219834A - Pipe coupling with seals compressed by flanges

Info

Publication number: GB2219834A
Application number: GB8814128A
Authority: GB
Inventors: Anthony David Renton
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-06-15
Filing date: 1988-06-15
Publication date: 1989-12-20
Also published as: GB8814128D0

Abstract

A Pipe Coupling has a centre sleeve 4 in which the rubber seals sit. These are held together with end flanges, through which bolts are placed. When the bolts are tightened up the design of the coupling allows pipes of any given nominal diameter to be securely jointed. An annular lip on each flange extends inside the sleeve into contact with the seal. <IMAGE>

Description

PIPE COUPLING DESCRIPTION The invention relates to a pipe coupling.

Pipe couplings are used to join plain ended pipe (ie) steel, Cast Iron, Ductile Iron, Polyethylene, PVC or Asbestos Cement. They can also be used as a transission coupling to create a seal between all these pipes.

Most of these couplings are heavy in nature and often leak due to the design of the rubber in the housing. It often happens that the rubber extrudes out of the end flange causing degradation to the rubber.

According to the present invention there is provided a pipe coupling manufactured from plastic, metal or any other suitable material to join cast iron, ductile iron, polyethylene, PVC, steel, asbestos cement. It will join all the above materials and can act as a transition coupling in each given nominal size, without leakage.

The centre sleeve (or barrel) of the coupling encapsulates the whole of the rubber, whilst the end flanges are designed with the inside lip to create a lid effect which when the coupling is tightened pushes against the sealing rubber which in turn has no where else to go but to collapse onto the pipe wall, this creating a leak tight seal. The rubber being encapsulated within the sleeve cannot extrude out of the end flange The rubber sealing ring is so designed that the lips on the internal diameter of the rubber collapses onto the wall of the pipe thus creating a barrier to prevent leakage. The seal can be achieved both by this method or ribbing or a taper long enough to force down against the wall of the pipe.

A specific embodiment of the invention will now be de#scribed by way of example with reference to the accompanying drawings in which: Fig.l Shows in perspective the coupling in position on a pipeline ......

Fig.2 Illustrates the centre sleeve with rubber.

Fig.3 Illustrates the centre sleeve with rubber and end flange in position.

Fig.4 Illustrates end flange with inside lip.

Referring to the drawing when Fig.2 comes into contact with Fig.4 the end flange with lid effect lip. The rubber is forced onto the pipe wall. Because of the design of the centre sleeve (a barrel) Fig.2 the rubber cannot escape through the end flange Fig.4 due to being encapsulated by the centre sleeve.

Claims

1. A pipe coupling comprising of a centre sleeve designed to hold the rubber gasket. Two end flanges with inside lip to create a lid effect. The coupling is tightened by bolts.

2. A pipe coupling as claimed it will join plain ended pipe of any given nominal diameter or act as a Transition fitting.

3. A pipe coupling as claimed in claim 1 or claim 2 has a centre sleeve containing the rubber seal.

4. A pipe coupling as claimed in claim 2 and claim 3 has end flanges with internal lips to create a lid effect thus eliminating the risk of the rubber extruding out of the end flange.

5. A pipe coupling as claimed in claim 4 is drawn together by tightening the bolts. The lid effect on the end flange pushes down onto the rubber seal contained in the centre sleeve. This forces the rubber onto the pipe wall and creates e seal.