由于这种泵的结构和螺杆间存在的侧间隙，它可以输送非润滑性介质。
Owing to the pump structure and side clearance between screw, it can transport non-lubricative medium.
所以选择不锈钢材质的高粘度泵是一定要注明具体的使用温度，及介质的润滑性。
So choose stainless steel high viscosity pump is must indicate the specific temperature, and medium lubricity.
润滑脂：普通润滑脂或泵用重水润滑脂。
Lubricating grease: General grease or heavy water grease used for pump.
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