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Pneumatic valve with a pressure regulator for bimorph type PZT actuator

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Abstract

The pressure regulator which is used for controlling the reducing pressure in the piezoelectrically driven pneumatic valve has been studied. The pneumatic valve of this study is two-stage type and consists of a piezoelectric actuator, a controller, a poppet valve and a pressure regulator. Nominal flow of 50 lpm, maximum operating pressure of 0.9 MPa and frequency characteristic of 10 Hz or higher are required in this pneumatic valve. The pressure regulator is needed because piezoelectric actuator has no ability to control the pressure of 0.9 MPa directly. In this study, a bimorph type PZT actuator of 25.2 mm(L) × 7.2 mm(W) × 0.5 mm(H) with constant of −220 × 10−12 CN−1 was proposed and investigated. Maximum operating force of 0.052 N and maximum displacement of 63 μm were achieved from the fabricated PZT actuator. From the analysis results, an orifice diameter of 0.6 mm was selected for a piezoelectric actuator. The pressure regulator which can be operated under 0.15 MPa easily was designed and manufactured. Performance and effects of design parameters were simulated by the Simulink of Matlab software, and it was confirmed that the performance characteristics of manufactured pressure regulator are superior in the common use pressure range of 0.5 to 0.7 MPa. The results show that the proposed pressure regulator is suitable for the pneumatic valve with a PZT actuator.

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Abbreviations

A p :

Cross-sectional area of poppet [m2]

A r :

Control part area of pressure regulator [m2]

A r1 :

Inlet area of pressure regulator [m2]

B p :

Friction coefficient of poppet [N·s/m]

B r :

Friction coefficient of pressure regulator [N·s/m]

D r :

Control part diameter of pressure regulator [m]

D r1 :

Inlet diameter of pressure regulator [m]

G m :

Mass flow of solenoid actuator [kg/s]

G p :

Mass flow of poppet [kg/s]

G r :

Mass flow of pressure regulator [kg/s]

k :

Specific heat ratio

k p :

Spring constant of poppet [N/m]

k r :

Spring constant of pressure regulator [N/m]

m p :

Mass of poppet [kg]

m r :

Spool mass of pressure regulator [kg]

P m :

Control pressure of poppet [Pa]

P o :

Output pressure of poppet [Pa]

P r :

Control pressure of pressure regulator [Pa]

P s :

Supply pressure [Pa]

Q m :

Control flow of poppet [m3/s]

Q p :

Output flow of poppet [m3/s]

Q r :

Flow of pressure regulator [m3/s]

R :

Air constant

S em :

Effective area of solenoid actuator [m2]

S ep :

Effective area of poppet [m2]

S er :

Effective area of pressure regulator [m2]

T :

Absolute temperature [oK]

V o :

Air volume of poppet [m3]

V p :

Air volume of pilot part [m3]

V r :

Air volume of pressure regulator [m3]

V r0 :

Control part initial volume of pressure regulator [m3]

x po :

Initial displacement of poppet spring [m]

x r :

Displacement of pressure regulator [m]

ρ :

Air density [kg/m3]

References

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Author information

Authors and Affiliations

  1. Korea Institute of Machinery and Materials(KIMM), Daejeon, Republic of Korea

    S. N. Yun, Y. B. Ham & J. H. Park

  2. Kyungwon Ferrite Ind. Co., Ltd., Gyeonggi, Republic of Korea

    H. J. So

  3. Pukyong National University, Busan, Republic of Korea

    I. Y. Lee

Authors
  1. S. N. Yun
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  2. Y. B. Ham
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  3. J. H. Park
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  4. H. J. So
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  5. I. Y. Lee
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Corresponding author

Correspondence to S. N. Yun.

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Yun, S.N., Ham, Y.B., Park, J.H. et al. Pneumatic valve with a pressure regulator for bimorph type PZT actuator. J Electroceram 20, 215–220 (2008). https://doi.org/10.1007/s10832-007-9172-9

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  • DOI: https://doi.org/10.1007/s10832-007-9172-9

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