Self-operated differential pressure control valve
Self-operated differential pressure control valve can automatically adjust without external energy depending on the pressure change of controlled medium. It can automatically eliminate the flow deviation caused by residual pressure head and pressure fluctuation of pipeline network and constant pressure difference between inlet and outlet of users. It is helpful to stabilize the operation of the system. It is especially suitable for household metering or automatic control system.
Key points of product selection:
1. The main control parameters of self-operated differential pressure control valve are nominal diameter, differential pressure control range, nominal design pressure, medium allowable temperature range, control accuracy, etc. It belongs to dynamic balance valve.
2. Installation of self-operated pressure difference control valves in a variable flow water system where the pressure difference is constant at two points can eliminate the interference caused by flow regulation by users within the controlled system, and also eliminate the interference caused by pressure fluctuation of external network to the controlled system, so that the controlled system can operate in a more stable condition, so as to ensure the quality of heating (air conditioning) and save energy. Purpose.
3. In the dynamically controlled pipe network system, if the terminal is a variable flow system, a self-operated differential pressure control valve should be installed to ensure that the controlled system works normally under the rated differential pressure.
4. The pressure difference between the supply and return pipes in the controlled loop can be kept constant by installing self-operated pressure difference control valves at the horizontal branch, the main pipe inlet of the variable flow system and the branch and main pipe inlet of the dynamic system with temperature control valves or control valves.
5. Self-operated differential pressure control valves should be selected according to the range of flow rate and working pressure difference (note: because the range of working pressure difference of most products is relatively narrow, if it exceeds the range of work, it will lose its control function), and valve specifications should not be selected directly according to pipe diameter.
6. Indoor heating is a metering and charging system of two-pipe system, and the thermodynamic inlet should be equipped with self-operated differential pressure control valve. The pressure difference at both ends should not be greater than 100 kPa and less than 8 kPa.
7. If the actual working pressure difference of the pressure difference control valve exceeds the range of the product working pressure difference, other adjusting equipment should be used for initial adjustment.
8. Normally, self-operated differential pressure control valves have no shut-off function, so additional shut-off valves are needed.
9. Attention should be paid to prevent impurities in water from blocking the capillary or diaphragm box components of the valve, with water filters in front of the valve.
