PPV Injector
Dipensing valves type PPV are perfectly adapted to supply a fixed amount of lubricant with high accuracy before to assemble small components as for instance, brakes, electrical wire connectors, door locks, roller bearings…The discharge volume can be adjusted by a screw . In addition, the system is capable of suction backing, so there is no drops backflow.
Operation
Position stand-by
The pilot piston which opens the release air moves up and the grease pressure is applied to the top and bottom faces of the main piston. The main piston moves upwards as a result of the ensuring difference of area in pressure on its side.
Position dispensing
When the pressurised air is introduced on air piston, the pilot piston is pushed down and the grease come through the surrounding of it. Grease applied on the top face of the main piston pushes down it. Lubricant which was contained under the main piston is dispensed.
Position return of the pilot piston
When the air is released, the pilot piston returns to its initial position under the effect of the spring. At this time, a suction effect is created under the pilot piston to avoid drops. The PPV valve is ready for the next cycle.
