| 摘要 |
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.
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