New HASCO Needle Valve Range Z107900/...
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The new needle valve range Z107900/... combines many years of HASCO experience in the field of needle valve technology with the latest sealing developments and a rugged adjusting mechanism.
The specifications for developing the new components focused on ease of assembly, service-friendly operation, a high level of flexibility and modular design. As a result, the amount of maintenance for the customer has been reduced to a minimum. The modularity of the subassemblies guarantees optimum availability of the individual components. Every drive unit is equipped with a special adjusting mechanism that balances out the centre misalignment through heat expansion. Needle assembly is also very easy and is carried out from outside via the platen. The subsequent fine adjustment of the needle position when warm, is performed with a conventional screwdriver.
For the hydraulic operation, two different housing variants have been produced, each in three sizes and two stroke lengths for different needle diameters. Z107900/... is intended for integration into the platen and contains the plunger and a housing with correspondingly high surface quality for the desired freedom from leakage.
This inner plunger together with the adjusting mechanism is also used for the second housing variant Z107920/... as a flange version on the hot runner, in combination with a spacer and cooling plate. This allows fully wired and piped systems to be produced. Opening of the hydraulic system for assembly / dismantling of the valve needles is not necessary with either system. Consequently, the conditions are always clean in the event of servicing or repair.
The pneumatic drive solution Z107910/... has a built-in cylinder in the clamping plate, and also uses the modular interior components for the adjusting mechanism. The units are available in four sizes with different needle diameters and variable stroke. In addition, the possibility exists with this design to block the plunger with a locking edge washer. Should a cavity become defective, the individual cavity can thus be closed down without interrupting the entire production process.
The new needle valve range is rounded off by an extensive selection of accessories, e.g. new spacers for heat insulation, high-precision valve needles and valve needle guides to seal off against the melt stream.
