International Appliance Manufacturing 2008 - (Page 13) life, especially at lower pressures. Intake air must be filtered and should be generally dry. Not suitable for full-pressure restarts. Rotary vane: Highest air flow relative to physical size, but not applicable to high-pressure applications. Can be oillubricated or oil-less. Smoothest air flow,free of pulsation. Simple design contributes to long life. Less efficient than piston or diaphragm pumps. Characteristic “whine,” especially in smaller sizes. Vane debris can contaminate output air. Not suitable for full-pressure restarts. Articulated piston: Generally chosen for heavy industrial applications requiring longest life, especially where full-pressure restart is required. High pressure and vacuum with high flows. Can be oil-lubricated or oil-less. Noise can be an issue. Relatively heavy and higher priced. Intake air must be filtered and dry. Diaphragm: Best for lower pressure or moderate vacuum at lower air flows. Tolerant of aggressive media, including liquids. Quiet operation. May have lower pulsation than some piston pumps. Many sizes and price points for application flexibility. Generally oilless design for clean air flow. Can be designed to allow full-pressure restarts. Linear: Fits applications requiring moderate flow with low pressure or vacuum. Long life and efficient with extremely low power consumption. Low pulsation on pumps with large integral exhaust volumes. Some types have liquidpumping capability. STEP 2: THOROUGHLY UNDERSTAND THE WOB-L If all signs point toward a WOB-L piston pump for your application, now’s the time to get up close and personal. A Bit of History: The patent for the original WOB-L piston pump was filed in 1974 and granted in 1976, meaning that the technology is both relatively modern and time-proven. In the patent application, inventors Arthur Droege Sr. and Richard Bell, of Thomas Industries (now Thomas Products Division), International Appliance Manufacturing 2008 13
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