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WITTMANN introduces new upgrades of water flow controller series
Source:Adsale Plastics Network    Editor:JK    Date:06.May.2021

The predecessor models 101 and 301 of WITTMANN had satisfied users worldwide for decades. They were used for distributing cooling water and cooling molds as well as specific areas inside injection molding machines, such as the feed zone, or the oil cooling system in hydraulic machines.


The company has launched the new water flow controller series 110 and 310. The tried-and-tested method of pipe cleaning, which can be carried out without removing the pipe through the top part of the housing, has been left unchanged in the 110 and 310 series. It is easy to replace the O-ring by lifting the pipe out of the bracket and then pulling it through the housing.

 

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(1) EPDM O-ring. (2) Polyamide 12 is the best choice of material for use with hot water up to 100 °C. (3) For the heavy-duty use, a fiber-glass-reinforced PPO (polypropylene oxide) compound has been chosen as the material for the top and bottom parts of the flow controller’s housing. (4) Adjustment rings to display the flow quantity.


A novelty is the new control valve that allows precise control of the flow rate. The double sealing of the valve disk towards the spindle and the axial movement performed by the valve disk instead of a radial movement are also novelties in the sector of cooling water flow controllers.

 

These innovations contribute to reduced wear of the O-rings and extend their service life. The O-rings themselves are made of EPDM and offer a high level of chemical and thermal resistance. As before, the sensor tube of the thermometer is placed directly in the return water and thus responds quickly to temperature fluctuations.


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Series 110


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Series 310


To keep the pressure drop inside the flow controller to a minimum, the cross-sections have been designed as large as possible, since a minimal pressure drop constitutes a decisive advantage at low system pressure.

 

Additional valves are also offered for the new 110 and 310 series, such as the central shut-off or Z-valve for central blocking of the water supply to several circuits in the event of interruptions in the injection molding cycle. Single shut-off valves or E-valves are available as well, which are used to interrupt the cooling process in individual mold circuits by cutting off the cooling water flow.


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Solenoid shut-off valves (left) and optional blow-out valve.


E-valves are normally used in combination with temperature sensors evaluated by the injection molding machine’s control system. In this way, temperature control of individual mold cooling circuits can be performed by cooling pulses.

 

Besides, the optional blow-out valve has an additional compressed air connection and enables – usually in combination with the Z-valve – emptying of the mold circuits by blowing out the cooling water.

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