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2. Ball valve - Wikipedia

   en.wikipedia.org/wiki/Ball_valve

   A ball valve is a flow control device which uses a hollow, perforated, and pivoting ball to control fluid flowing through it. It is open when the hole through the middle of the ball is in line with the flow inlet and closed when it is pivoted 90 degrees by the valve handle, blocking the flow. [1]

3. Control valve - Wikipedia

   en.wikipedia.org/wiki/Control_valve

   A control valve is a valve used to control fluid flow by varying the size of the flow passage as directed by a signal from a controller. [1] This enables the direct control of flow rate and the consequential control of process quantities such as pressure , temperature , and liquid level.

4. Persephone (instrument) - Wikipedia

   en.wikipedia.org/wiki/Persephone_(instrument)

   The Persephone ribbon controller is also able to record pressure or velocity. The ribbon is a linear potentiometer that generates different control voltages depending on where it is touched. Thus, the modern ribbon on the Persephone replaces the nickel-chrome resistance wire used as a variable resistor to control the pitch of the trautonium 1.

5. Flow control valve - Wikipedia

   en.wikipedia.org/wiki/Flow_control_valve

   Control valves are normally fitted with actuators and positioners. Pneumatically-actuated globe valves and diaphragm valves are widely used for control purposes in many industries, although quarter-turn types such as (modified) ball and butterfly valves are also used. Control valves can also work with hydraulic actuators (also known as ...

6. Four-way valve - Wikipedia

   en.wikipedia.org/wiki/Four-way_valve

   The four-way valve or four-way cock is a fluid control valve whose body has four ports equally spaced round the valve chamber and the plug has two passages to connect adjacent ports. The plug may be cylindrical or tapered, or a ball.

7. Why Bill Gates Is Telling All About Life Before His Billions ...

   www.aol.com/why-bill-gates-telling-life...

   Microsoft founder Bill Gates is telling his “origin story” in his own words with the memoir Source Code, being released on Feb. 4 "My parents and early friends put me in a position to have a ...