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Euro-Stel supplies all kinds of non-return valves for any type of injection-moulding machine and screw. Similar to screws and barrels, the choice of the proper metal and the thermal treatment for the non-return valve are highly important. A perfect geometrical design provides the valve with an accurate and smooth functioning as well as a long life.

There are four different types of non-return valves, with multiple variants:
• 3-part non-return valve with loose ring
• Ball valve
• 3-part non-return valve with rotating ring
• Special valves for special applications and valves with mixing function

The choice of the appropriate non-return valve depends on a number of elements, such as the type of plastics to be treated, the required dosing accuracy and the resistance to wear. Finally, the price matters too. Ball valves are more accurate than all other kinds of valves, but as they require more manufacturing processes, they are more expensive as well.

3-part non-return valve with loose ring

The 3-part non-return valve is the most popular type of valve. The valve consists of a winged centre, a ring and a seat. With respect to the manufacturing technology, this is a rather simple type of valve, which explains its relatively low price.
Our valves are extremely resistant to wear because of the use of reinforcing layers and the appropriate thermal treatments.

Ball valve

Ball valves have a highly accurate shot precision and repeatability. This accuracy is due to the high pressure sensitivity and the reaction speed of the ball integrated in the valve. Our valves are internally and externally reinforced with special steel alloys and then receive a thermal treatment.
Ball valves however are not suitable for all materials; furthermore, a number of rules must be observed when using this kind of valves.

3-part non-return valve with rotating ring

This type of non-return valve is easier to manufacture and has a relatively good injection characteristic. Because of the co-rotation of the ring with the screw, some important rules must be observed when using this kind of valves. Good heating conditions and a good condition of the barrel are very important to avoid damage on the ring.

Special valves for special applications and valves with mixing function

Euro-Stel also supplies some special non-return valves for the processing of e.g. thinly liquid materials, highly transparant PC, glass fiber filled PA,…
We also have valves with special mixing function. These valves are specially designed in function of the material to process and the aimed target.

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