****美國PARKER微型比例閥，5001571
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? Mass Flow Control
Thermally compensated 2-way normally closed (NC) proportional valve designed to maintain accurate
and repeatable flow over a wide range of media. Ideal for medical
 and analytical applications that require precision control and flow up to 56 slpm.
比例閥的驅動裝置是比例電磁鐵
? Proven performance tested to 100 million life cycles
? RoHS compliant
Typical Application
既然是節(jié)流控制，就必然有能量損失，
system performance. Together with its ability to provide precise control over
varying temperatures and media types, the VSO® miniature proportional valve
is ideally suited for manufacturers of medical and analytical equipment.
Features
? Enables precise flow control for improved instrument accuracy
? Thermally compensated to maintain precise flow over a wide range of media
使用比例閥或伺服閥的目的就是：以電控方式實現(xiàn)對流量的節(jié)流控制
The VSO® miniature proportional valve provides enhanced flow control for
applications where precise control flow control is required up to 56 slpm.
? Computer automated calibration and serialization for performance traceability
? Cleaned for Oxygen and Analytical Service use
? Pressure & Flow Control
? Gas Chromatography
? Mass Spectrometry
? Ventilators
? O2
The VSO® miniature proportional valve provides precise flow control of gas in
proportion to input current. The valve can be controlled with either DC current
or pulse width modulation along with closed loop feedback to deliver optimal
Concentrators/Conservers
? Anaesthesia Delivery & Monitors
（當然經過結構上的改動也可實現(xiàn)壓力控制等），

****美國PARKER微型比例閥，5001571