Valve Flow Resistance Test Device
The valve flow resistance test device is suitable for various types of valves (regulating valves, pressure reducing valves, ball valves, needle valves, solenoid valves, etc.) to test indicators such as flow coefficient, flow resistance coefficient, pressure difference-flow characteristics, opening-flow characteristics, etc. Testing and testing. It can also be used for similar performance testing of pipe fittings, joints, filters, flow meters, etc.
Analysis of professional terms:
Flow coefficient, that is, CV value (called: KV value in Chinese industry). It is an important process parameter and technical indicator for industrial valves such as valves and regulating valves . The correct calculation and selection of the CV value is an important step to ensure the normal operation of the pipeline flow control system. It refers to the volume flow rate, or mass flow rate, of the pipe mass flowing through the valve when the pipeline maintains constant pressure under test conditions per unit time, that is, The maximum flow capacity of the valve and the CV value of the valve must be determined through testing and calculation.
System:
The flow coefficient of a valve is an indicator of the valve's flow capacity. A large flow coefficient value indicates that the valve has a large flow capacity and the pressure loss when the fluid flows through the valve is small. When testing the valve flow coefficient by experiment, due to the measurement device and method The difference will make the test results vary greatly. Therefore, when measuring the pressure drop difference, the influence of factors such as the position of the pressure point, the piping conditions before and after the valve, the Lei Luo number of the fluid and the Mach number of the compressible gas should be considered. The system Conduct flow tests according to JB/T 5296, JB/T 14309 and other standards, and compare with BS EN1267 to illustrate the influence of thunder numbers on valve flow test results with examples. Due to the limitations of domestic flow test equipment, we currently have the ability to conduct flow positive tests on valves below DN600. Valves with larger diameters can be tested with air (please consult our company for details). The upstream throttle valve in the system is used to control the inlet pressure of the test section. Together with the downstream throttle valve, it is used to control the pressure difference between the pressure ports and keep the downstream pressure stable. The nominal size of the downstream throttle valve can be larger than Test the nominal size of the valve to ensure that when blocked flow occurs, the blocked flow occurs in the test valve.
