What is the control valve? Why it is not suitable for variable flow operation mode? Why the self-operated flow control valve is only applicable to the constant flow of quality regulation system is not suitable for variable flow operation mode?
The first will produce dynamic hydraulic imbalance. When the system to the heat source for the active variable flow control, or who through other means to reduce the flow of the system, the pipeline will reduce the pressure, heating due to the pressure on the smaller, near-end user self-operated flow control valve will automatically open a large spool, maintain the original constant flow. As a result of a number of characteristics of the resistance, the flow control valve of this special structure making the pipe flow changes the S value changes, the number of network characteristics of resistance will change, the proportion of the total flow in the pipe in the distribution changes accordingly. Proximal end users and remote users can not change the total flow with the geometric change. Flow changes only flow change the remote user. Dynamic hydraulic imbalance which will cause the heating network, remote users fail to use the heat requirement.
Secondly, when the user is required to adjust the room temperature independent, self-operated flow control valve, the valve after the user needs to increase traffic, due to the limitations of self-operated flow control valve, flow can not get by; when users need to reduce the flow valve, the mutual interference between users will, self-operated flow control valve can become useless power consumption of pump valve.
Finally, the need to increase the circulating water flow can not get by. Circulating pump to reduce the outdoor climate, the need to increase the circulating water, the user traffic due to the control of self-operated flow control valve, the flow can not get by. So, no matter is the user active variable flow heat supply network or to the heat source for the active variable flow heat supply network can not be applied self-operated flow control valve. Self-operated flow control valve is only applicable to the constant flow of quality control system.
However, many heating companies have chosen frequency, multi-pump, little pump, pump, small pump and variable flow operation, the hydraulic balance of selected self-operated flow control valve is wrong. Self-operated flow control valve installed in the heating network can not use variable flow operation mode.
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