12 needle valve
Needle valve is a throttling valve, adjusting precision is higher. Valve needle, along the flow direction of movement, change the flow area, to truncate or flow adjusting valve. Needle valve is a kind of fine-tuning valve, the valve plug for needle, mainly used for adjusting the gas flow. Fine-tuning require valves open mouth increases gradually, from closed to open for finely adjusted.Needle...
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