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    Valve actuator

    Clarification. The rotor is cylindrically shaped. Picture the circle that “defines” the cylinder. The axis of rotation is the center of the circle. The diameter of the circle is about 2cm, the height of the cylinder is about 2.5-3.5 cm. There is a stop arm attached to the axis of rotation...
  2. E

    Valve actuator

    I am looking for a method of actuating a valve on a musical instrument. This particular valve needs to rotate 90 degrees, but on some instruments, 120 degrees. I will like to actuate via wire control i.e. with a embedded computer. For example, close a switch, the valve rotates 90 degrees and...
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    Do Quasars exist right now?

    I currently understand that quasars are billions of light years away from us. So the light from those distant quasars that reaches us now, started its journey a billion years ago. When we examine quasars today we are really looking at something that existed a very long time ago and very far...