![]() ![]() The flow of the working medium through the valve gap increases with the load force 20. However, the disadvantage of this valve is the sensitivity to changes in the load force of the piston rod drive. The most common pneumatic elements used to regulate the flow of the working medium are throttle valves and throttle-check valves. Throttle check valves are widely used in pneumatics as flow control elements in many industries. To obtain the simultaneous movement of pneumatic drives, for example, motion synchronizer 17, 18 throttle or throttle-check valves 7, 19 are used. On/off solenoid valves are commonly used in industry because they are pneumatic components that are less expensive than proportional valves 15, 16. Pneumatic systems use proportional valves 11 and on/off solenoid valves 12, 13, with which to regulate air flow 5, 14. It is difficult to obtain the same displacement of drive piston rods under different load 1, 2, mainly due to the fact that compressed air is compressible 3, 4, 5, and there is also movement resistance caused by self-friction of drive pistons 6, 7, 8, 9, 10. ![]() When there is a different external load, uneven movement of the drive piston rods is observed. In systems where pneumatic drives are used, simultaneous movement of the piston rods is necessary. The simulation provided information on the occurrence of supersonic and subsonic flow velocities at specific valve opening heights. The authors investigated airflow phenomena for different valve opening heights. The throttle valve assembly has been scaled for a suitable degree of synchronization of the movement of the piston actuators independently of the different external loads acting on each of them. The obtained results made it possible to determine the distribution of physical quantities of static pressure, the velocity of the medium flowing through the valve, or the vector velocity distribution. Numerical simulation (CFD) makes it possible to study the flow phenomena inside a pneumatic throttle-check valve, with different sizes of flow gaps. The purpose of this article is to present a CFD simulation of a pre-adjusted check valve throttle. The throttle valves on the test stand were scaled and the air flow rate values were read for different valve opening heights. In order to determine the boundary conditions, experimental tests were carried out. This type of control is used in an innovative rehabilitation device for lower limbs. The article presents a numerical CFD simulation of a throttle-check valve used in an innovative control system for two pneumatic drives. ![]()
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