Continuation of international application no.

摘要

The invention relates to a valve for protecting against fire intended to the ducts of aération.elle comprises a valve body (100), a stopper (140), a rod (160), a first end is secured to said shutter, the support means (170) comprising a central part (170a) provided with an internal thread, an adjustment socket (200) externally threaded (220) traversed by said rod (160) and cooperating with said internal thread of the central part, a return spring (230) at least partially surrounding said rod (160) and the means forming a fuse (240) in order to maintain said shutter (140) separated from said valve seat (120), said return spring (203) is, in the compressed state, at least partially inside said adjustment socket (200), the first end of the said adjustment socket (200) comprising a rim (202) serving as bearing at one end of the return spring (230), the other end of said spring being secured to the second end of the rod, for which the entire length of the sleeve is used to house the spring.