Needle valve hot runner , because the way of driving the valve needle is not the same, there are two kinds of pneumatic drive and hydraulic drive, plus the structure without a shunt plate, that is, the single point needle valve hot runner is a total of three types, the gate is usually on the surface of the commodity, and there is also a pneumatic or hydraulic drive equipment, namely the cylinder (cylinder) and piston.

​

Therefore, the processing request of the mold is relatively high, the plate thickness request is not the same, the structure is relatively complex, usually used in large injection parts, there are also hot cooling and full hot structure, the composition of relevant parts, different kinds of hot runner because of its structure is not the same and the gate way is not the same, so the composition is not the same. For the hot runner of the needle valve, according to the air pressure input by the external electromagnetic signal after the injection cycle is completed, the valve needle is actuated to seal the glue, and the sealing glue is broken entirely by its own air pressure or oil pressure to drive the valve needle, which is different from the open hot runner.
Needle valve hot runner because there is no restraint of the cooling time of the runner system, there is no cold runner, the parts can be ejected in time after forming and curing, and the molding cycle of many thin-walled parts is relatively short, saving time and saving cost.
Because the needle valve type is used to accurately control the production of precision parts, the molded parts have good gate quality, low residual stress after demoulding, and small deformation of parts.