FIELD: packing devices for isolating shaft of wells during various technological operations.;SUBSTANCE: interval packer device contains longitudinally positioned upper and lower packers with sealing collar packing. Upper packer is made hydro-mechanical, lower packer - repression-depression action hydraulic packer. Positioned between packers is valve unit of two-side action, hydraulically connected to lower packer through in-pipe and annular spaces. It consists of hollow body with at least one radial channel and differential bushing with radials apertures positioned on the body and spring-loaded on both ends by means of reciprocal force springs. All packers are made so that each one of them may be used independently or in composition of other assemblies.;EFFECT: increased reliability of operation and expanded functional capabilities of devices.;4 cl, 13 dwg
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