What do you multiply by to convert inches of mercury vacuum

What do you multiply by to convert inches of mercury vacuum to pounds per square inch of vacuum? What are two ways of synchronizing two parallel pneumatic cylinders? Which way is more reliable? An electrical logic diagram has how many vertical legs and how many horizontal rungs? A compressor\'s or a pump\'s intake port is the port of increasing or decreasing volume? How can you sometimes tell the difference in the two ports by examination if the ports are not labeled?

Solution

4) to convert inches of mercury to pounds per square inch we have to divide by 2

ex : vacuum pressure = 15 inches = 7.5 psi

5) One way of synchronizing cylinders is with external mechanical hardware. Some common mechanisms are racks and pinions, crankshafts, cables and pulleys, and chains and sprockets. The accuracy of these methods depends on the strength of the hardware and the position of the load. Mechanical methods are the most common way to accurately synchronize air cylinders. One advantage of mechanical synchronization is that the cylinders can operate anyplace in the stroke without getting out of phase. The accuracy of mechanical synchronization is about ±0.005 to 0.010 in. -- depending on load variation and strength of the mechanism used.

The most accurate way to synchronize hydraulic cylinders is with servovalves. Servovalves independently control each cylinder with electronic position feedback, and compare each actuator\'s position with all others. This is the most expensive way to synchronize cylinders but the most accurate. Actuator position within ±0.001 to 0.002 in. of each other is attainable using good servo practices. (This type of synchronizing also works well with cylinders that never go to a home position.)

6) two vertical legs and two horizontal legs

7) decreasing the volume.