AUTOMATIC THERMOVALVE Russian patent published in 2002 - IPC

FIELD: household and industrial gas sets; protection of gas supply systems at emergencies. SUBSTANCE: automatic thermovalve designed for cutting off gas supply in case of fire has housing with shutoff member installed inside opposite to through hole. Spring- loaded shutoff member is provided with stop and lock. Inner space of lock is filled with low-melting substance, and cylindrical rod locking shutoff member is brought out of said space. Stop is installed at side opposite to spring. Shutoff member is made in form of ball installed with eccentricity relative to axis of through hole. Ring groove is made in housing space into which stop and lock are placed diametrically opposite relative to ball Stop is made in form of washer with open trapezoidal cutout. Lock is provided with channels connecting its space with space of housing. Lock space is made cylindrical mating to cross section of tod. End faces of rod are made flat. Value of rod penetration into lock space is not less than 0.25 of its diameter. EFFECT: improved reliability and accuracy of operation of automatic thermovalve. 2 cl, 6 dwg