The invention relates to a check valve of the locking strength, which makes possible the lowering of charges without vibrations. / p & & p & this valve comprises a shutter 20 which comprises a concave face 30 surrounding a conical annular seat 18, and it is configured in the manner that, when it opens, the useful for closing force increases, which requires an elevation of the pressure in the three-dimensional opening prevents the motor 14 to open the obturator. Conversely, any condition of racing is accused, because, when the pressure drop in the dimension of the circuit is subjected to the pumping pressure, the shutter reduced its opening and performs a function of the metering. / p & & p & field of application of the handling heavy loads.
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