- Oral injector valve open Closing valve is operated hydraulically. In hydraulic structures, piston and cylinder are located in upper plate. Before pressing, closing the valve in position indented. This makes the hole vents expanded to allow plastic to flow into the cavity. Before plastic in chemical vents ranhoan full, then move to the position closing the valve. Springs compartment latch valve does not allow it to control the time or the movement of the valve
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