Feed screws – the heart of the pump
螺杆——泵的核心
-Selection of screw (pitch size)
螺杆的选择（螺距大小）
-dependinging on flow rate and differential pressure
-综合考虑流量和出口压力
-The higher the pressure the smaller the screw pitch size (proportional pressure build up)
-更高的出口压力，选择更小的螺杆间距
-The higher the volume flow the bigger is the screw pitch size
-更大的流量，选择更大的螺杆间距
-The smaller the screw pitch size the better is the suction power
-螺杆间距越小， 自吸力越强
-Shear senstive products need more closed chambers to reduce backflow
-剪切敏感产品选择更小的密封腔减小回流剪切
-Abrasive products need low rpm and sufficient closed chambers for min back flow/slippage over the clearance
-磨蚀性产品需要降低运行转速，并且足够小的密封腔，减小回流和运行的磨损
Screw pitch size selection is the key for trouble free operation
选择合适的螺杆是确保泵平稳运行的关键
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