Three-Screw Pumps
Chaojun's own introduction names three-screw pumps; request the actual selected pump rather than assuming the construction from unrelated NM-series part titles.
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Xupu Chaojun Mechanical Equipment lists cylindrical grinder pumps in its public product or service description.
Identify the fluid or gas, required delivery duty, suction conditions and available drive supply. Request the actual proposed equipment, connection drawing and operating information rather than assuming one pump construction suits every installation. Request the current catalogue or drawing for this item, and confirm the offered configuration and supporting documents with the company before specifying an order.