Restrained sealed bolted joints of fluid piping systems,...

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F16L 23/024 (2006.01) F16L 19/02 (2006.01) F16L 21/08 (2006.01)

Patent

CA 2179220

In restrained sealed bolted joints of fluid piping systems, including both plastic and metallic pipe, improvements have previously been made in providing adequate grip rings to keep the inserted ends of pipe in place. When larger diameter pipes, especially larger diameter plastic pipes, were inserted into these sealed bolted joints, some difficulties were encountered. Therefore, a compression control ring is now provided to controllably transfer and to limit the tightening force component, which moves the gasket into sealing contacts with the respective pipe sections being joined. Also circumferentially spaced skid pads are positioned about each grip ring, assuring each respective grip ring will not prematurely commence gripping a pipe. In addition, the gland has been improved, so any possible large assembly forces, or any large fluid pressures in the piping system will not be effective in distorting the gland.

Cette invention concerne des raccords étanches boulonnés de tuyauteries composées tant de tuyaux en métal que de tuyaux en plastique, qui avaient été auparavant améliorés par l'ajout d'anneaux de blocage adéquats servant à maintenir en place les bouts des tuyaux à assembler. Avec des tuyaux de gros diamètre, en particulier des tuyaux en plastique, cette solution présentait des problèmes. Par conséquent, il est maintenant proposé de faire appel à un anneau limiteur de compression qui limite les forces de serrage à une valeur appropriée et qui met les joints en contact étanche avec les tronçons de tuyaux assemblés. Par ailleurs des patins espacés sur le pourtour des anneaux sont prévus pour éviter que l'anneau de blocage ainsi équipé ne serre prématurément le tuyau à assembler. De plus, le presse-joint a été amélioré de façon à ce qu'il puisse résister à des forces de serrage élevées ou encore à de fortes surpressions intempestives dans la tuyauterie.

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