FIELD: valves.
SUBSTANCE: valve unit comprises body, at least one inlet orifice and at least one outlet orifice, channel, which connects inlet and outlet orifices and at least one rupturable disc or the same member, which seals said channel in intact state. Valve unit has piston member provided with piercing member for rupturable disc puncturing. Piston member has pressurizing medium channel coaxially extending through piston member from the first end to the second end thereof. The channel defines pressurizing medium path after rupturable disc puncturing. Piston member may slide as pressure is applied thereto in direction towards rupturable disc up to piston member abutment upon bush so that even small orifice in rupturable disc is enough for piercing member penetration through rupturable disc in area corresponding to piercing member cross-section.
EFFECT: improved air-tightness and reliability of valve unit, possibility to create channel having constant cross-section in any case.
6 cl, 4 dwg
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