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2. Square D - Wikipedia

   en.wikipedia.org/wiki/Square_D

   Square D is an American manufacturer of electrical equipment headquartered in Andover, Massachusetts. Square D is a flagship brand of Schneider Electric , which acquired the company in 1991. The company was listed on the New York Stock Exchange for 55 years prior to its acquisition without reporting financial loss in any calendar quarter ...

3. Pressure tank - Wikipedia

   en.wikipedia.org/wiki/Pressure_tank

   Pressure tank. A diaphram type pressurizer on a domestic rainwater system, with the pump and Square D pressure switch in the background. A pressure tank or pressurizer is used in a piping system to maintain a desired pressure. Applications include buffering water pressure in homes. [1]

4. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids.

5. AOL Mail

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6. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Checking tire pressure with a spring and piston tire-pressure gauge. Pressure measurement is the measurement of an applied force by a fluid (liquid or gas) on a surface. Pressure is typically measured in units of force per unit of surface area. Many techniques have been developed for the measurement of pressure and vacuum.

7. Talk:Square D - Wikipedia

   en.wikipedia.org/wiki/Talk:Square_D

   The square D pressure switch is ubiquitous in farm and similar small-scale water systems in Australia. I have two (one for the bore, the other for the rainwater tank or "house" pump) on my little property at Hobbys Yards. Andrewa 06:45, 14 June 2016 (UTC)