FIELD: oil-gas producing industry, particularly, equipment of mouth of water-injection wells subject to freezing at winter time. SUBSTANCE: equipment of mouth of water-injection well has pipes, gates and valve. Valve is made equalizing disk-type. Valve body is located on external wall of tubing and has thrust ring on rod and spring for provision of forced opening of valve with pressure dropped in tubing. Valve is located in well below boundary of ground freezing and directly communicated with annular space and tubing. EFFECT: higher reliability of equipment of injection well mouth due to simplified valve design, reduced specific quantity of metal and valve location in zone not subject to freezing. 1 dwg
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