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How many main categories of check valves exist?

  1. 2

  2. 3

  3. 4

  4. 5

The correct answer is: 3

There are three main categories of check valves swing, lift, and tilt. Option A is incorrect because there are more than two main categories of check valves. Option C is incorrect because there are not four main categories of check valves. Option D is incorrect because there are not five main categories of check valves.