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IN BRIEF: Fluid power
By Christine M Ferrara, Associate Editor -- Design News, July 4, 1999
Panaflo® axial fans from Panasonic Industrial Co. feature a sealing process that protects circuitry, pc-boards, and connections against invasive moisture, dust, and high ambients. The fans are available for operation with a choice of signal outputs, and feature low noise and minimum vibration. Operating temperature range is -10 to 70C, and all sizes are available in either 12 or 24V dc models.
Series RVDT anti-siphon valves from Plast-O-Matic Valves Inc. prevent gravity-induced siphonage from storage tanks, and remain closed under the pressure created by the presence of liquid in a tank and piping system, but open under pump pressure. In chemical process applications, the anti-siphon valve protects a system from unwanted flow through a pump due to negative pressure in a pipeline. The RVDT actually closes tighter under the presence of vacuum at the valve outlet; yet it opens and allows chemicals to enter the system under controlled pumping, the company says.
Cryogenic valves from Valcor Engineering Corp. are for critical flow control of liquid nitrogen and liquid carbon dioxide. The valves provide maximum cryogenic fluid throughput with minimum pressure drop, the company says. Applications include coolant controlled for environmental chambers, and liquid and gas chromatography.
Flow tubes from Andrews Glass Co. are for use in equipment and instrumentation that require precise flow control. The company uses shrinking equipment to produce flow tubes to exact specifications, and can manufacture tubes to handle gas flows from 0.1 ml to 20l .
