对流量大允许压降小的情况，应选用阻力小的板型，反之选用阻力大的板型。
For large flow pressure drop allows small, should choose small resistance of the plate type, vice choose resistance of plate type.
如果校核压降超过允许压降，需重新进行设计选型计算，直到满足工艺要求为止。
If check pressure drop exceeds allowed pressure drop, redesign to type selection calculation, until meet the technological requirements.
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