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Flow Characterization of a Piezo-Electric High Speed Valve

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Author(s): T. Takiya

Journal: International Journal of Engineering Research and Applications
ISSN 2248-9622

Volume: 2;
Issue: 2;
Start page: 14;
Date: 2012;
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Keywords: Compressible Flow | Flow Rate | Hot Wire Anemometer | Orifice Flowmeter | Piezoelectric Valve | Pipe Flow

ABSTRACT
Injecting a gas into fusion reactors or semiconductor manufacturing systems, one has to quickly control the flow rate by a piezoelectric valve. In order to construct a gas injection system with high speed valves in the future, performance tests have been conducted on a commercial piezoelectric valve. An orifice flowmeter for measuring time average flowrate and a hot wire anemometer for instantaneous flowrate were manufactured. The total flow coefficient of the orifice flowmeter was obtained experimentally under a low pressure of a 10-2 Pa and a low flowrate of a few mg/s, although they are smaller than the values specified by Japanese Industrial Standards. It is found that the hot wire anemometer installed downstream in the vicinity of the valve is suitable for detecting the change in flowrate with the response time of less than 1 ms.
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