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  2. BBB Reveals America's Most Complained-About Businesses - AOL

    www.aol.com/news/2012-03-02-bbb-reveals-americas...

    The other industries in the top 10 most-checked list each generated more than a million inquiries: used-car dealers, car repair shops, plumbers, new car dealers, mortgage brokers, construction ...

  3. Pneumatic actuator - Wikipedia

    en.wikipedia.org/wiki/Pneumatic_actuator

    A pneumatic actuator mainly consists of a piston or a diaphragm which develops the motive power. It keeps the air in the upper portion of the cylinder, allowing air pressure to force the diaphragm or piston to move the valve stem or rotate the valve control element. Valves require little pressure to operate and usually double or triple the ...

  4. Actuator - Wikipedia

    en.wikipedia.org/wiki/Actuator

    Pneumatic actuator operating a valve through a rack-and-pinion mechanism. [7] A pneumatic actuator is similar to a hydraulic one but uses a gas (usually air) instead of a liquid. [8] [9] Compared to hydraulic actuators, pneumatic ones are less complicated because they do not need pipes for the return and recycling of the working fluid. On the ...

  5. Air-operated valve - Wikipedia

    en.wikipedia.org/wiki/Air-operated_valve

    An air-operated valve, also known as a pneumatic valve, is a type of power-operated pipe valve that uses air pressure to perform a function similar to a solenoid. As air pressure is increased, the compressed air starts to push against the piston or diaphragm walls which causes the valve to actuate. Whether the valve opens or closes depends on ...

  6. Better Business Bureau (BBB) complaints and accreditation ...

    www.aol.com/lifestyle/better-business-bureau-bbb...

    A BBB-accredited company agrees to abide by a set of accreditation standards BBB says are "attributes of a better business." These include honesty in advertising, transparency, and responsiveness ...

  7. Valve actuator - Wikipedia

    en.wikipedia.org/wiki/Valve_actuator

    The blue valve body is visible in-line with the pipe. The valve actuator opens or closes the butterfly disc of the valve based on electrical signals sent to the actuator. Another valve actuator is visible in the background, with windows to indicate the valve position. A valve actuator is the mechanism for opening and closing a valve. Manually ...