Performance of the piezo-poppet valve. Part 2

To study the vibration characteristics of the poppet valve induced by cavitation, the signal analysis method based on the ensemble empirical mode decomposition (EEMD) method was studied experimentally. The component induced by cavitation was separated from the vibration signals through the EEMD method. The results show that the IMF2 component has the largest amplitude and energy of all components. The root mean square (RMS) value, peak value of marginal spectrum, and center frequency of marginal spectrum of the IMF2 component were studied in detail. The RMS value and the peak value of the marginal spectrum decrease with a decrease of cavitation intensity. The center frequency of marginal spectrum is between 12 kHz and 20 kHz, and the center frequency first increases and then decreases with a decrease of cavitation intensity. The change rate of the center frequency also decreases with an increase of inlet pressure.

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Optimization of Structure and Calculation of Flow-Force on Poppet Valve under Converging Flow

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.339.148 ◽

2011 ◽

Vol 339 ◽

pp. 148-151 ◽

Cited By ~ 1

Author(s):

Shu Juan Zheng ◽

Long Quan

Keyword(s):

Cfd Simulation ◽

Internal Flow ◽

Poppet Valve ◽

Converging Flow ◽

Simulation Results

This paper optimizes the structure of the poppet valve based on the internal flow. The flow-force on poppet valve in the case of the converging flow is simulated and studied by CFD. Simulation results represent that the traditional formula for computing the flow-force can be used only in the certain range, so the formula is modified based on the simulation result.

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Effect of surface non-flatness on the lubrication characteristics in the valve part of a swash-plate type axial piston pump

Meccanica ◽

10.1007/s11012-014-9893-1 ◽

2014 ◽

Vol 49 (5) ◽

pp. 1275-1295 ◽

Cited By ~ 23

Author(s):

Jung-Hun Shin ◽

Kyung-Woong Kim

Keyword(s):

Piston Pump ◽

Axial Piston Pump ◽

Swash Plate ◽

Lubrication Characteristics ◽

Axial Piston ◽

Plate Type ◽

Valve Part ◽

Effect Of Surface

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A New Infinitely Variable Poppet Valve Gear

Journal of the Institution of Locomotive Engineers ◽

10.1243/jile_proc_1931_021_056_02 ◽

1931 ◽

Vol 21 (102) ◽

pp. 481-536

Author(s):

V. W. Holmes

Keyword(s):

Poppet Valve ◽

Valve Gear

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Numerical analysis of fluid flow in the throttle poppet valve channel in precision machinery

10.1117/12.819758 ◽

2008 ◽

Cited By ~ 2

Author(s):

Tongle Xu ◽

Xinyi Zhang

Keyword(s):

Fluid Flow ◽

Numerical Analysis ◽

Poppet Valve

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A Silicon Micromachined Valve Driven by a Bi-Stable Electromagnetic Actuator

10.1115/imece1999-0271 ◽

1999 ◽

Author(s):

S. Böhm ◽

G. J. Burger ◽

M. T. Korthorst ◽

F. Roseboom

Keyword(s):

Fluid Flow ◽

Silicone Rubber ◽

The Other ◽

Dead Volume ◽

Electromagnetic Actuator ◽

Rubber Sheet ◽

Rubber Layer ◽

Sandwich Construction ◽

The One ◽

Valve Part

Abstract In this contribution a micromachined open/closed valve is presented which is driven by a conventionally manufactured bistable electromagnetic actuator. Basically the micromachined valve part, 7 × 7 × 1 mm3 in dimension, is a sandwich construction of two KOH etched wafers with a specially formulated silicone rubber layer in between. This rubber sheet forms a flexible flow path, which can be open and closed to control a fluid flow. In order to provide a large stroke of about 200 μm, a precision-engineered bi-stable electromagnetic actuator was selected. This actuator consists of a spring-biased armature that can move up and down in a magnetically soft iron housing, incorporating a permanent magnet and a coil. It will be shown that this combination of micromachined and precision-engineered components provides the required low dead volume on the one hand and a large actuator stroke on the other. Another benefit of the application of a bi-stable actuator is the fact that only energy is needed in order to switch between the open and closed state. Moreover, the large stroke makes the valve particle tolerant thus allowing media like cell suspensions and whole blood.

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