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The new valve needle can reduce the breakage rate of long glass fibers

The new valve needle can reduce the breakage rate of long glass fibers

The new valve pin system, through optimized flow channel design and thermal isolation structure, can reduce the breakage rate of long glass fibers by more than 40%, achieving a gate-free molding effect. Some manufacturers have developed square valve pin head sealing structures that can achieve a sealing accuracy of 0.02mm, significantly improving the appearance quality of plastic parts.

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2025

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Displacement accuracy control of the valve needle

Displacement accuracy control of the valve needle

The valve needle uses a plug-in installation structure linked with a lever drive mechanism, achieving millimeter-level displacement precision control through the extension and retraction of the pressure cylinder piston rod. Its conical surface taper angle is designed between 45° and 75°, with the tip diameter 4% larger than the valve body discharge end to achieve dynamic sealing.

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2025

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Material and Surface Treatment of Valve Needle

Material and Surface Treatment of Valve Needle

The valve needle body is usually made of high-hardness steel, such as 4140 alloy steel or 1Cr13 stainless steel, with a yield strength of over 850MPa. The surface is nitrided to enhance wear resistance, and some high-end models use CrAlN coating, reducing the friction coefficient to below 0.15.

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2025

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The installation position of the valve sleeve affects accuracy

The installation position of the valve sleeve affects accuracy

In hot runner systems, the valve bushing is usually installed on the manifold or above the hot nozzle, but both positions are close to high-temperature plastic, which easily causes thermal expansion and increases dimensions, leading to valve bushing displacement and inner hole deformation, affecting the valve pin movement accuracy. The patented technology of Changsha Best Hot Runner Technology Co., Ltd. places the valve bushing directly above the nozzle core, which can reduce deformation caused by excessive temperature.

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2025

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Side-Entry Hot Runner Structure Patent

Side-Entry Hot Runner Structure Patent

On July 25, 2025, according to Financial界 news, Changsha Best Hot Runner Technology Co., Ltd. obtained a patent for "A Needle Valve Side-Entry Hot Runner Structure." By placing the valve sleeve directly above the nozzle core and aligned vertically with the gate, and fitting it over the valve needle to guide its vertical movement, this design can prevent injection molding defects such as flash, short shots, and flow marks.

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2025

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Modular design of the valve needle

Modular design of the valve needle

The valve needle adopts a modular structural design, consisting of three core components: the execution end, the connection part, and the drive interface. The connection part is equipped with standard plug-in slots and avoidance slots, allowing for an assembly tolerance compensation of ±0.5mm; the drive interface is equipped with a standard M16 threaded interface, compatible with hydraulic/pneumatic actuator connections.

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2025

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The valve pin can solve the injection molding temperature problem

The valve pin can solve the injection molding temperature problem

A patent for a needle valve type hot runner assembly points out that by sleeving a needle valve sleeve on the part of the needle valve located inside the hot runner, it can prevent the needle valve from heating due to shear, solving the problem of the needle valve temperature rising and easily burning the product near the sealing glue point or causing the needle valve to stick to the glue position at the sealing glue port.

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2025

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The hot runner system prevents glue leakage

The hot runner system prevents glue leakage

A hot runner system and injection mold patent shows that by fixing an annular protrusion on the valve pin, when the valve pin moves to the position opening the hot runner gate, the top surface of the sealing glue contacts the top surface of the injection channel, sealing the clearance between the valve pin and the valve pin sleeve to prevent glue leakage and improve the sealing reliability of the hot nozzle.

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2025

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Dongguan Rewin Seiko Technology Co., Ltd

+86 0769-8158-5878

+86 189-3821-0408

sales@dgrewin.com

Address: No. 20 Xinle Road, Jiangbei, Wusha, Chang'an Town, Dongguan City

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