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Research Papers

Development of a Novel High Pressure Electronic Pneumatic Pressure Reducing Valve

[+] Author and Article Information
Xu Zhipeng, Wang Xuanyin

The State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou 310027, China

J. Dyn. Sys., Meas., Control 133(1), 011011 (Dec 22, 2010) (7 pages) doi:10.1115/1.4002715 History: Received November 12, 2009; Revised July 17, 2010; Published December 22, 2010; Online December 22, 2010

Pressure reducing valve (PRV) is one of the critical components in high pressure pneumatic systems. Nowadays, manually operated PRVs have been widely used, but there is still no universal electronic PRV. Thus, we proposed a novel high pressure electronic pneumatic pressure reducing valve (EPPRV) whose inlet pressure (pi) is up to 31.5 MPa. The EPPRV mainly consists of a poppet structured pilot valve and a piston structured main valve. A proportional electromagnet was used as the command element, and a pressure closed loop, rather than a force closed loop controller, was designed. First, the mechanical design and functionality of the EPPRV are carefully analyzed. Then, a mathematical model is built up, and the working characteristics of pressure, flow rate, and frequency response are simulated. Finally, the test bench is introduced, and detailed experiments are carried out. Simulated and experimental results are highly consistent within output pressure (po) ranging from 8 MPa to 25 MPa and load flow rate (qld) ranging from 60 g/s to 650 g/s, which verifies the feasibility of the novel structure and the validity of the mathematic model.

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Figures

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Figure 1

Schematic diagram of the EPPRV

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Figure 2

Schematic diagram of the pilot valve

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Figure 3

Block diagram of the EPPRV

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Figure 4

Schematic diagram of the test bench. 1: gas supply; 2: stop valve; 3: EPPRV; 4: flow meter; 5: buffer chamber; 6: throttle valve; S1, S2: pressure sensors.

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Figure 5

Pictures of the EPPRV and the test bench: (a) the EPPRV with pressure sensors and (b) the test bench

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Figure 6

Step responses with different pt

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Figure 7

pi curve when pt is at 25 MPa (experiment)

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Figure 8

Step responses under different pi

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Figure 9

Steady po with different qld

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Figure 10

Frequency response of the EPPRV (simulation)

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