SYSTEM FOR THE LEAKTIGHT CONNECTION OF VALVE UNITS TO RESPECTIVE PIPES, IN PARTICULAR FOR USE WITH COMBUSTIBLE GASES

摘要

A system for the leaktight connection of a valve unit (1) to a respective pipe (2), in particular for combustible gases, in which said valve unit comprises a gas through-flow section which can be connected, with flow communication, to a respective end section of the pipe, a threaded male attachment element (3) being formed integrally with the valve unit and having an axial through cavity (4) defining the gas through-flow section, for leaktight clamping by pipe-fixing ring-nut means which can be screwed onto the male threaded portion of the attachment element (3). The system comprises second leaktight connection means which can be put into operation as an alternative to the ring-nut connection means that can be screwed onto the male attachment element, for the connection of the valve unit to at least one second type of pipe end, the second connection means comprising at least one axial retaining element (11) which can be releasably restrained on the valve unit (1) in the region of the threaded portion of the male attachment element (3), in a manner such that the pipe (2) is restrained axially relative to the valve unit (1).