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Research Papers

Modeling of a Fast Plate Type Hydraulic Check Valve

[+] Author and Article Information
Eugenio Leati

Institute of Machine Design
and Hydraulic Drives,
Johannes Kepler University,
Altenbergerstr. 69,
Linz 4040, Austria
e-mail: eugenio.leati@jku.at

Christoph Gradl

Institute of Machine Design
and Hydraulic Drives,
Johannes Kepler University,
Altenbergerstr. 69,
Linz 4040, Austria
e-mail: christoph.gradl@jku.at

Rudolf Scheidl

Institute of Machine Design
and Hydraulic Drives,
Johannes Kepler University,
Altenbergerstr. 69,
Linz 4040, Austria
e-mail: rudolf.scheidl@jku.at

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received December 31, 2014; final manuscript received February 8, 2016; published online March 29, 2016. Assoc. Editor: Umesh Vaidya.

J. Dyn. Sys., Meas., Control 138(6), 061002 (Mar 29, 2016) (11 pages) Paper No: DS-14-1554; doi: 10.1115/1.4032826 History: Received December 31, 2014; Revised February 08, 2016

Check valve dynamics plays an important role in many fluid systems, such as in compressors, hydraulic pumps, and hydraulic switching converters. Plate type check valves are a frequently employed valve type in dynamically challenging cases. Despite the relevancy of plate valve dynamics, only few exhaustive works can be found in the literature, focusing on the behavior of hydraulic check valves for high-frequency applications. This paper presents an in-depth characterization of a plate valve designed as rectifier of a high-frequency oscillation pump working at 300 Hz. The aim is to identify a sufficiently simple mathematical model, which permits to optimize the design of the valve for the considered application. The paper analyses the different phenomena contributing to the dynamics of such a valve and presents the results of simulation and experimental activity. The results show how small details in the design and manufacturing of those valves (namely, the contact surfaces) have important consequences on the dynamics of the pump system. In general, a good agreement between model and reality is achieved.

Copyright © 2016 by ASME
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References

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Figures

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Fig. 1

Check valve symbol and types: (a) ball valve, (b) poppet valve, (c) plate valve, and (d) multidisk plate valve

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Fig. 2

The plate valve object of the study

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Fig. 3

Schematic of the plate valve considered

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Fig. 4

Base mesh and refinement around the disk

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Fig. 5

Flow pattern obtained with CFD

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Fig. 6

Particular of the velocity distribution underneath the plate

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Fig. 7

Flow rate from CFD and from theoretical models

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Fig. 9

Reference geometry for pipe and valve displaced volume

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Fig. 8

Flow forces and flow factor obtained by CFD simulations

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Fig. 10

Reynolds domain and its boundaries for the considered valve

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Fig. 11

Example of pressure distribution for squeeze (left) and stiction (right)

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Fig. 12

Schematic of the plate elastic deformation in case of imperfect surface

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Fig. 13

Leakage measured and reproduced through plate deformation model

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Fig. 20

Step response with the opening of the inlet valve

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Fig. 21

Step response with the opening of the outlet valve

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Fig. 22

Effect of the short pipe impedance in a pumping cycle at 300 Hz

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Fig. 23

Effect of stiction on pressure peaks

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Fig. 17

Simulation of stiction effect with different models of plate contact

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Fig. 18

Schematic of the circuit used to test the valves

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Fig. 19

Test rig used for valve characterization

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Fig. 24

Pumping cycles at different frequencies and pressures: (a) low pressure, 200 Hz, (b) low pressure, 400 Hz, (c) high pressure, 200 Hz, and (d) high pressure, 400 Hz

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Fig. 25

Volumetric efficiency of the pump

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Fig. 14

Example of a pumping cycle

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Fig. 15

Simulation of a 300 Hz pumping cycle with increasing model complexity

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Fig. 16

Particular of the opening's dynamics of the outlet valve

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