FIELD: test equipment.
SUBSTANCE: device for pipeline liquid replacement and leakage test with an inaccessible end point, which is installed in an inaccessible end of the pipeline on the pressure side and represents a two-component circulating valve containing the first valve assembly (4) containing sealing element (1) that can close and open the valve depending on dynamic pressure of fluid medium flowing through it and the second valve assembly (6) for long-term shutoff of fluid medium after leakage test is completed. The first valve assembly (4) includes elastic O-ring (1) for closing and opening the valve by being borne against the seat when fluid medium velocity through the valve increases, and the second valve assembly represents casing (6) located inside the valve, which closes the valve when pressure difference increases between chamber (7) and inner space of valve (4).
EFFECT: improving reliability of the device even at temperature variation and considerable contamination of fluid medium.
10 cl, 7 dwg
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