FIELD: valves.
SUBSTANCE: valve unit 20 comprises housing 21, at least one the first inlet orifice 26, at least one the second inlet orifice 27 and at least one outlet orifice 28. Valve unit has assembly including at least one breakable disc 23 or similar member, which closes channel defined by the second inlet orifice 27 and by at least one outlet orifice 28 before disc 23 tearing. Valve unit also has piston 25 including piercing member 24 or similar member adapted to rupture breakable disc 23. During breakable disc rupturing the piston may slide at least between two positions. In the first position channel defined by the second inlet orifice 27 and by at least one outlet orifice 28 is closed. Piston is moved in the second position as pressure difference between the second inlet orifice and the first inlet orifice reaches predetermined level.
EFFECT: increased air-tightness and reliability at valve actuation.
6 cl, 2 dwg
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