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How does a 2-way valve work?

  1. Dec 26, 2008 #1
    A water based heating system is to be regulated by 2-way valves. How do these work exactly? Do they simply constrict the flow? Isn't it so that if a pipe is constricted, the velocity simply increases to maintain the flow? I mean, flow in must equal flow out.
  2. jcsd
  3. Dec 26, 2008 #2


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    Science Advisor

    A general two-way valve just acts as stop-flow valve (e.g. solenoid valve). Nothing much to them.

    Here is a diagram and a brief description of one:


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