FIELD: test equipment. SUBSTANCE: device has hollow heat-insulated case 1 with adjusted restrictor 2, which has locking member made in form of cone-shaped needle 3. The needle is shifted by means of two position governors: threaded one and hydraulic one. Position governor is made of two bellows 5 and 6, diameter of bellows 5 is larger than diameter of the other bellows. Pressure-tight hollow, which is formed by bellows 5 and 6, is filled with working mixture 7, which has low thermal expansion coefficient and high heat capacity. Edge 8 of bellows 5, which has larger diameter, is connected with cone-shaped needle 3. Movable edge 9 of bellows 6, which has smaller diameter, is connected with rod of threaded position governor 4 of cone-shaped needle 3. EFFECT: improved reliability of operation. 3 cl, 1 dwg
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