FIELD: oil extractive industry.
SUBSTANCE: device has shaft on which pressurizing element, compensating spring, mounting assembly and fixing assembly are placed. Pressurizing element is made of coal-graphite collars with insert bushing, enveloped by extrusive washers on both sides. Compensating spring is made I from of disk springs. Mounting assembly is a hydraulic cylinder with piston and fixing assembly.
EFFECT: simplified construction, higher reliability.
2 dwg
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