Wittmann Launches New Generation of Water Flow Controllers

For more than 40 years, WITTMANN flow controllers have been part of the standard equipment for many injection moulding machines, with more than 500,000 units sold. With the release of flow controller series 110 and 330, WITTMANN sets new benchmarks for a new generation with a familiar look.

For more than 40 years, WITTMANN flow controllers have been part of the standard equipment for every injection moulding machine. With more than 500,000 devices sold, they have long been the undisputed number one.

The predecessor models 101 and 301 had satisfied users worldwide for decades. They were used for distributing cooling water and cooling moulds as well as specific areas inside injection moulding machines, such as the feed zone or the oil cooling system in hydraulic machines. The new 110 and 310 flow controller series are setting new benchmarks to ensure the ongoing technical progress for these products, which seem simple at first glance but prove to be sophisticated when taking a closer look.

Series 110
1: EPDM O-ring. – 2: Polyamide 12 is the best choice of material for use with hot water up to 100°C. – 3: For heavy-duty use, a fibre-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.

Proven and new features

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.

An absolute 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. With these features, WITTMANN is setting a new, unprecedented standard.

These vital 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 very quickly to temperature fluctuations. 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.

Interesting options

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 moulding cycle. Single shut-off valves or E-valves are also available, which are used to interrupt the cooling process in individual mould circuits by cutting off the cooling water flow. E-valves are normally used in combination with temperature sensors evaluated by the injection moulding machine’s control system. In this way, temperature control of individual mould cooling circuits can be performed by cooling pulses.

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

The blow-out valve, which is also available as an option, has an additional compressed air connection and enables – usually in combination with the Z-valve – emptying of the mould circuits by blowing out the cooling water.

Specifications

 

Series 110

series-110_6-circuits

The essential device for your plastics processing machines for open and closed cooling circuits. Flow volume is indicated in accordance with the float measuring principle: a cone is lifted by the water flowing in the return of the moulded circuit.

Flow range per circuit: standard 0–10 l/min.

  • On request: AI, PVC-cones.
  • Standard: mould connections with 12 mm brass socket for 3/8″ hoses.
  • On request: threaded connection with G 3/8″ brass threaded sleeve.
  • Option: screwed 14 mm brass socket for 1/2″ hose, or screwed 20 mm brass socket for 3/4″ hose.
Series 310

series-310_8-circuits

The optimum flow regulator for large injection moulding and blow moulding machines. Its low-pressure drop makes it suitable for the highest flow volumes. However, by means of a special design of the regulating valves, excellent regulation and accurate reproduction of cooling water volume and temperature in the different mould circuits can also be achieved for low flow volumes.

  • Flow range per circuit: Standard 0–30 l/min.
  • On request: AI, PVC-cones.
  • Standard: mould connections with G 3/8″ brass threaded sleeve.
  • Option: with screwed 14 mm brass socket for 1/2″ hose, or screwed 20 mm brass socket for 3/4″ hose.

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