Self-flow control valve for the occasion

Self-operated flow control valve can only be applied to constant flow mass adjustment system. When the system uses the heat source as the main variable flow control, or by other means (inverter, reduce the number of circulating pumps, pump and other small change) to reduce system flow, the pressure on the pipe network will be reduced, the heat network near the end As the user pressure becomes smaller, the flow valve automatic spool will open large, to maintain the original constant flow, flow changes is only the remote user traffic changes. The near-end users and remote users can not change in proportion with the total traffic changes (in each parallel pipe segment, the characteristic resistance of any pipe segment S value changes, the total number of network resistance will change, the total The distribution of the flow rate in each pipe section also changes correspondingly). This will inevitably result in the thermal network dynamic imbalance, far-end users reach the heat requirements. Therefore, the installation of self-flow control valve heating network can not be used to change the flow of operating mode. At present, many heating companies choose to convert frequency, multi-pump, less pump, pump, pump to achieve variable flow operation, heat network hydraulic balance selection of self-flow control valve is wrong. When users take the initiative to change the flow of operation, the user needs to increase the flow after the valve, due to the limitations of self-flow control valve, the flow increase; when the user needs to reduce flow after the valve, the user will interfere with each other, self-flow The control valve became a useless valve that consumed only pump power. Therefore, neither the user-based variable flow heat network or heat source-based heat flow can not be applied to the self-flow control valve. Self-flow control valve is only suitable for constant flow of mass adjustment system. This article Keywords: control valve

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