FIELD: valving. SUBSTANCE: seat surface is cylindric, and the housing has an additional flowing opening. The axis of the opening is coincident with the axis of the first flowing opening of the housing and is perpendicular to the longitudinal axis of a rod. The rod has [-shaped face wherein a sealing roller is received. The radius of the roller is, at least, equal the radius of the seat. The middle part of [-shaped face of the rod is made up of cylinder and encloses the sealing rollers. EFFECT: enhanced reliability. 2 cl, 2 dwg
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