Determination of flow rate characteristics for pneumatic valves

Varga, Zdenek; Keski-Honkola, Petri

doi:10.1051/epjconf/20122501096

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…Based on the patent of the authors, an automatic measurement system (AMS) was developed to measure the leakage flow rate in industrial CAS. The article [19] describes a method for measuring the characteristics of the flow rate of a proportional pressure regulator based on the charge and discharge of the tank through the valve while monitoring the downstream pressure, the upstream pressure, the temperature of the supply air, and the pressure inside the tank. In the work [20], a new discharge method was proposed for the flow characteristics of high-pressure pneumatic servo valves, based on the principle of sonic discharges of series connection orifices.…”

Section: Measurement Methods To Determine the Flow Parameters Of Pneu...mentioning

confidence: 99%

Measurement of Pneumatic Valve Flow Parameters on the Test Bench with Interchangeable Venturi Tubes and Their Practical Use

Dindorf

2023

Sensors

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A test bench with interchangeable venturi tubes was built to automatically measure the flow parameters of pneumatic valves of a wide range of sizes. This measuring stand contained components recommended by the ISO 6358 standard, an individually configured flow meter circuit, and HMI measurement and control panels. The flow meter circuit, individually configured with interchangeable venturi tubes, bypass loops, and Setaram thermal microflow meter, was calibrated using Molbloc/Molbox equipment. The tuning curve and theoretical flow rate characteristics of the tested valve were fitted to the flow rate measurement data. The best fit value of the critical pressure ratio was obtained using the numerical method of least squares minimization. The pneumatic valve with measured flow parameters was compared with data from the catalogue on the discharge characteristics of the compressed air tank. A practical solution for high-pressure tank discharge time using two valves connected in series to the hybrid tricycle bike (HTB) pneumatic propulsion system is presented. This article presents a solution to the practical problem of measuring the flow parameters of industrial pneumatic valves with a wide range of nominal diameters on a test bench with replaceable venturi tubes.

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Section: Measurement Methods To Determine the Flow Parameters Of Pneu...mentioning

confidence: 99%

Measurement of Pneumatic Valve Flow Parameters on the Test Bench with Interchangeable Venturi Tubes and Their Practical Use

Dindorf

2023

Sensors

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“…The mathematical model of a pneumatic system is highly non-linear [8], [9], [10], and the numerical simulation is used to determine the capability of the system to perform a given task, in terms of dynamic behavior.…”

Section: The Theoretical Analysis Of the Intelligent Pneumatic Actuatormentioning

confidence: 99%

Linear pneumatic actuator

et al. 2017

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Abstract. The paper presents a linear pneumatic actuator with short working stroke. It consists of a pneumatic motor (a simple stroke cylinder or a membrane chamber), two 2/2 pneumatic distributors "all or nothing" electrically commanded for controlling the intake/outtake flow to/from the active chamber of the motor, a position transducer and a microcontroller. There is also presented the theoretical analysis (mathematical modelling and numerical simulation) accomplished.

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“…Thus, due to the C and b values that have not been informed by the valve manufacturer, in this work, we consider an alternative procedure for estimating these parameters. Such procedure is based on charging and discharging a constant volume tank through the valve evaluated at isothermal conditions [34,35]. In agreement with the state equation of ideal gases [17], the pressure variation at the valve downstream connected to a pneumatic load can be expressed as where ṗ out is the valve output pressure derivative (bar/s); κ is the conversion factor; R is the gas ideal constant = 286,9 (J/Kg °K); V is the container volume (m 3 ); and V is the container volume derivative (m 3 /s).…”

Section: Appendixmentioning

confidence: 99%

“…The first parameter was obtained from ( 13) and the second one, as the point where the derivative of the valve output pressure signal changes. Of note is that b value expresses the divide of the valve downstream and upstream absolute pressure for which the flow rate through it becomes choked [17,34,35]. Besides, the effect of the flow-rate disturbance on PPRV outlet absolute pressure was modelled according to (1) and (2) and using the C and b values previously estimated.…”

Section: Appendixmentioning

confidence: 99%