CHECK VALVE Russian patent published in 2004 - IPC

FIELD: valving.

SUBSTANCE: check valve has a valving member, which has the periphery side and passage with the outlet opening from any side. The outlet opening at one end of the passage is sealed with the valving member, which provides one of the outlet openings to be open at a given pressure in the passage exceeding the ambient pressure. The valving member has the O-shaped sealing ring. The sealing ring is made of a flexible material, e.g. rubber or flexible plastic material. One of the outlet openings of the passage is positioned in the groove sealed with the valving member. The sharp edges are arranged over periphery and provided on the parts, which are mounted and locked one with respect to the other. An adjusting device provides the stepless adjusting of the ring sharp edges to control the blowing pressure and to lock ring sharp edges one with respect to the other after controlling the blowing pressure. The adjusting device has a screw joint. With this joint one ring sharp edge is displaced with respect to the other. When increasing the fluid pressure, at a moment, the O-shaped ring disengages from the sharp edges of the groove, at least, for several sharp edges, thus providing the discharge of the fluid to the ambient, while the pressure becomes so low that the flexibility of the O-shaped sealing ring prevails and the O-shaped ring again abuts against the sharp edges of the groove throughout the periphery.

EFFECT: simplified design.

1 cl, 5 dwg