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  5. Experimental study of characteristics of the control valve type “nozzle-damper” of hydraulic automatic control systems

Experimental study of characteristics of the control valve type “nozzle-damper” of hydraulic automatic control systems

O. Litvyak, S. Komar
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Description: In hydraulic actuators and hydromechanical automatic control systems, control valves of the “nozzle-damper” type are of-ten used. These elements are widely used due to reliability, as well as high sensitivity and high gain. The high gain of the control valve is both an advantage and a disadvantage. The disadvantage is primarily that minor valve defects affect its characteristics, and then, repeatedly reinforced, are transmitted to the actuators. As a result, the linearity of the hydraulic drive characteristics and the operation of the automatic control system as a whole are violated. Therefore, it is very important to identify deficiencies in the early stages of production before installing the valve in the unit. The paper presents the results of experimental studies of a control valve of the type “nozzle-damper, which is used in the pump-regulator HP-3. Previously, such studies have not been conducted. In the manufacture of control valves, only the flow rate through the valve in the closed position is checked, which gives only one characteristic point. The developed special device al-lows you to remove the static characteristic of the valve in the entire range of its operation, from a fully closed position to a fully open one. The pressure in the control cavity of the hydraulic actuator was taken as a measured parameter for constructing the characteristic, the valve was moved with a special screw with a small thread pitch, and its position was fixed with a micrometer. An analysis of the very first experimental static characteristics revealed uncharacteristic non-linear sections in the range of intermediate valve positions. The non-linearity of the characteristic is associated with the quality of manufacture of the control valve and can lead to improper operation of the pump regulator, in particular, to casts of an adjustable parameter. Thus, it is shown in the work that the static characteristic of the control valve can serve as confirmation of the quality of valve manufactur-ing in the early stages of production. In addition, it can be used to study the static and dynamic characteristics of automatic con-trol systems in mathematical modeling of their work.

Keywords: automatic control system, control valve, hydraulic actuator, valve static response, speed controller, pump-controller НР-3.


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 Lytviak, O.M. and Komar, S.V. (2019), “Eksperymentalne doslidzhennia kharakterystyk keruiuchoho klapana typu “soplo-zaslinka” hidravlichnykh system avtomatychnoho keruvannia” [Experimental study of characteristics of the control valve type “nozzle-damper” of hydraulic automatic control systems], Science and Technology of the Air Force of Ukraine, No. 4(37), pp. 56-60. https://doi.org/10.30748/nitps.2019.37.08.

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