Dosatron International

Richard Mahieux

Philippe Duquennoy

Najib Laatiaoui

Thibault Marion

A metering mechanism including a metering element that is translatably mounted in a jacket, the jacket being mounted in an adjusting sleeve that can cooperate with the jacket by way of a screwing movement, the screwing/unscrewing movement causing a translatory movement of the metering element; at one end, the metering element is provided with a check valve, and at the other end, same accommodates a plunger, the reciprocating translatory movement of which creates suction at the end of the element provided with the valve, followed by expulsion into a volume surrounding the other end of the metering element via a passage formed in at least one first sealing device and in a second sealing device. A proportioning pump including a metering mechanism of the type as well as to a method for using a pump of the type in at least two metering ranges.

Metering mechanism for a proportioning pump, and associated pump and usage method

A metering mechanism includes a body mounted in a sleeve covering the top and an adjustment nut covering the bottom, the adjustment nut threaded to the sleeve, the screw connection then causing rotation of the adjustment nut with respect to the body of the metering mechanism, the body being extended by a valve seat that can be closed by a valve, able to receive a plunger of which the reciprocating motion permits intake at the valve, the travel of the plunger depending on the screw position between the adjustment nut and the sleeve. The metering mechanism further includes a rotation lock between the adjustment nut and the body of the metering mechanism to prevent the adjustment nut being screwed or unscrewed on the sleeve. Also disclosed is a method for locking and unlocking such a mechanism, and to a proportional metering pump incorporating such a mechanism.

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Cursan, France

Richard Mahieux