AUTOMATIC THERMAL SHUT-OFF VALVE Russian patent published in 2008 - IPC F16K17/40 

FIELD: gas appliances.

SUBSTANCE: invention relates to household and industrial gas appliances and is designed to protect gas supply systems in emergency conditions, for example, to shut off gas supply in the case of fire. The automatic thermal shut-off valve incorporates a direct-flow hollow casing with a seat, a stem with a valve and a valve guide. The spring-loaded valve stem slides in the valve guide towards the seat and is furnished with a heat-sensitive aid to the valve closed. The valve stem has a circular groove arranged on the side of the stem free end and extending from the valve guide to a distance from the valve making, at least, a sum of the valve guide thickness and compressed spring height. The aforesaid aid a rod laid in the circular groove enclosing the stem. The thickness exceeds the circular groove depth. In the valve open state, the rod seats in the circular groove pressed by the compressed spring into the valve guide. A shape-memory material, e.g. nithynol, with an initial bent shape enclosing the valve guide allowing it to move spring-loaded along with the valve towards the seat.

EFFECT: simpler valve design, lower operating costs.

4 cl, 2 dwg