rus
Issue #7-8/2023
D.M.Ivankov, A.S.Lomakin, S.P.Bychkov, A.A.Kopylov
TEMPERATURE OPERATING MODES OF PROPORTIONAL GAS VALVES
TEMPERATURE OPERATING MODES OF PROPORTIONAL GAS VALVES
DOI: https://doi.org/10.22184/1993-8578.2023.16.7-8.476.480
This paper describes the results of experiments to study the effects of the temperature of a proportional gas valve on its main technical characteristics – the output gas flow and the width of the hysteresis loop. A comparative analysis of the results of measurements of the output gas flow rate for the Russian valve being developed and the most popular models of foreign valves – ASCO 202 and Norgren IMI FAS was carried out.
This paper describes the results of experiments to study the effects of the temperature of a proportional gas valve on its main technical characteristics – the output gas flow and the width of the hysteresis loop. A comparative analysis of the results of measurements of the output gas flow rate for the Russian valve being developed and the most popular models of foreign valves – ASCO 202 and Norgren IMI FAS was carried out.
Теги: output gas flow temperature characteristics пропорциональный газовый клапан расход газа температурные характеристики proportional gas valve
INTRODUCTION
The widespread use of proportional gas valves necessitates additional testing under various operating conditions.
One of the most important external factors affecting on such valve performance is the ambient temperature while a valve is operated.
The purpose of this work is to study the effect of valve temperature on its key characteristics, namely, output gas flow rate, hysteresis loop width and operation linearity. The study results will allow adjusting the testing modes at the production stage.
EXPERIMENT DESCRIPTION
The experimental setup for determining the gas flow rate of the proportional valve depending on the ambient temperature, is shown on the diagram in Fig.1, is a heat and cold chamber where proportional gas valve is installed. The heat and cold chamber allows setting the required operating temperature of the medium. The gas line, terminals for connecting the valve to the power supply and a thermocouple probe are introduced into the chamber. The inlet pressure is regulated by the filter regulator. The flow rate from the valve is recorded by a flow meter mounted at the outlet of the heat and cold chamber. The temperature of the valve is determined by means of a multimeter receiving the signal from the thermocouple.
The experiment was conducted in a KTH-20M heat and cold chamber (Fig.2), which allows for precise setting of the ambient temperature and the proportional valve operating temperature (Fig.3).
A manifold with a valve connected to it was installed in the chamber. Air enters the manifold through a gas tube coil wrapped around the manifold base. This arrangement of the tube allows the temperature of air entering the valve to be set close to air temperature in the chamber. At the valve outlet, the air enters the CITREX H4 flow meter through the flow laminator [1].
Experiments were conducted for three valves: Norgren IMI FAS [2], ASCO 202 [3] and a valve being developed by Pluton JSC. For each valve in the temperature range from 0 to 60 °C with a step of 5 °C, diagrams of the flow rate dependence on the PWM control signal width set on the Tektronix AFG3021C generator [4] were obtained. To stabilize temperature in the chamber and at the valve, measurements were not started until 25 minutes after the temperature was set on the KTX-20M control panel. The RMS was varied from 0 to 99 % in steps of 5 %. For each graph, the valve temperatures before and after the measurements were also recorded.
RESULTS
The results of measurements are presented in the diagrams (Fig.3–8).
CONCLUSIONS
The studies conducted in this work revealed an increase in the output gas flow rate with increasing ambient temperature. However, the increase in ambient temperature has a negative effect on stability of the proportional gas valves.
While temperature grows, the maximum flow increased linearly only for the Norgren IMI FAS valve (Fig.3). ASCO and AS Pluton valves are characterized by a jump-like increase in maximum flow (Fig.4, 5).
As the ambient temperature increases, the slope at which the valves begin to operate linearly shifts closer to 99 % (Figs.6–8). This indicates that at high temperatures, the proportional valves open more poorly at lower slots.
An increase in ambient temperature negatively affects the magnetic properties of the materials of the parts of the magnetically closed circuit [5], as well as the winding of the inductance coil resistance, which leads to magnetomotive force decrease that opens the valve.
PEER REVIEW INFO
Editorial board thanks the anonymous reviewer(s) for their contribution to the peer review of this work. It is also grateful for their consent to publish papers on the journal’s website and SEL eLibrary eLIBRARY.RU.
Declaration of Competing Interest. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
The widespread use of proportional gas valves necessitates additional testing under various operating conditions.
One of the most important external factors affecting on such valve performance is the ambient temperature while a valve is operated.
The purpose of this work is to study the effect of valve temperature on its key characteristics, namely, output gas flow rate, hysteresis loop width and operation linearity. The study results will allow adjusting the testing modes at the production stage.
EXPERIMENT DESCRIPTION
The experimental setup for determining the gas flow rate of the proportional valve depending on the ambient temperature, is shown on the diagram in Fig.1, is a heat and cold chamber where proportional gas valve is installed. The heat and cold chamber allows setting the required operating temperature of the medium. The gas line, terminals for connecting the valve to the power supply and a thermocouple probe are introduced into the chamber. The inlet pressure is regulated by the filter regulator. The flow rate from the valve is recorded by a flow meter mounted at the outlet of the heat and cold chamber. The temperature of the valve is determined by means of a multimeter receiving the signal from the thermocouple.
The experiment was conducted in a KTH-20M heat and cold chamber (Fig.2), which allows for precise setting of the ambient temperature and the proportional valve operating temperature (Fig.3).
A manifold with a valve connected to it was installed in the chamber. Air enters the manifold through a gas tube coil wrapped around the manifold base. This arrangement of the tube allows the temperature of air entering the valve to be set close to air temperature in the chamber. At the valve outlet, the air enters the CITREX H4 flow meter through the flow laminator [1].
Experiments were conducted for three valves: Norgren IMI FAS [2], ASCO 202 [3] and a valve being developed by Pluton JSC. For each valve in the temperature range from 0 to 60 °C with a step of 5 °C, diagrams of the flow rate dependence on the PWM control signal width set on the Tektronix AFG3021C generator [4] were obtained. To stabilize temperature in the chamber and at the valve, measurements were not started until 25 minutes after the temperature was set on the KTX-20M control panel. The RMS was varied from 0 to 99 % in steps of 5 %. For each graph, the valve temperatures before and after the measurements were also recorded.
RESULTS
The results of measurements are presented in the diagrams (Fig.3–8).
CONCLUSIONS
The studies conducted in this work revealed an increase in the output gas flow rate with increasing ambient temperature. However, the increase in ambient temperature has a negative effect on stability of the proportional gas valves.
While temperature grows, the maximum flow increased linearly only for the Norgren IMI FAS valve (Fig.3). ASCO and AS Pluton valves are characterized by a jump-like increase in maximum flow (Fig.4, 5).
As the ambient temperature increases, the slope at which the valves begin to operate linearly shifts closer to 99 % (Figs.6–8). This indicates that at high temperatures, the proportional valves open more poorly at lower slots.
An increase in ambient temperature negatively affects the magnetic properties of the materials of the parts of the magnetically closed circuit [5], as well as the winding of the inductance coil resistance, which leads to magnetomotive force decrease that opens the valve.
PEER REVIEW INFO
Editorial board thanks the anonymous reviewer(s) for their contribution to the peer review of this work. It is also grateful for their consent to publish papers on the journal’s website and SEL eLibrary eLIBRARY.RU.
Declaration of Competing Interest. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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