A miniature needle valve
Karvonen,Matti; Juhola,Maarit; Ahola,Ville; Söderlund,Lasse; Linjama,Matti (2010)
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It has been suggested that in order to obtain “the perfect valve” one should use large number of parallel connected, just one size of on/off-valves, to control the flow rate. With commercially available hydraulic on/off-valves, this is not practically reasonable because the number of valves needed is from tens to few hundred and the use of commercial on/off-valves leads to too big valve packages. In this paper a simple unidirectional spring return needle valve is miniaturized to size small enough to be used in digital flow control units consisting several dozens of valves. The most important design parameters are small size, operation on industrial hydraulic pressure level, fast response time and reasonable flow rate. A major problem in commercial valves is the size of the solenoid actuator thus the design includes both a hydraulic part and a solenoid actuator for it. Simulations, calculations, measurements and construction of the valve are presented. Capabilities of designed valve are discussed.
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