FIELD: oil and gas production industry. SUBSTANCE: valve has hollow body with radial openings and stepped recess, hollow spool with piston seated in stepped recess in middle part of body. In extreme lower position, radial openings of spool coincide with radial openings in body. Upper chamber between piston and spool communicates with annular space. Lower chamber is hermetically sealed. Application of aforesaid embodiment of valve allows for lowering immersible instruments into well during completing operations. EFFECT: higher efficiency. 1 dwg
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