FIELD: mining.
SUBSTANCE: proposed perforator comprises the case to accommodate reciprocating piston with rod, seal bush, return spring fitted on said rod, punch fitted in said case to displace radially. Said rod has lengthwise groove its length exceeding seal bush working depth while punch is fitted in said seal bush.
EFFECT: perforator operation at preset working fluid pressure, guaranteed punching in string.
2 cl, 3 dwg
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