Self-flow control valve is widely used in urban heating, heating systems and petroleum, chemical, metallurgy, light industry and other industrial automation systems. However, it can only be used for constant flow mass adjustment system is not suitable for variable flow operation mode. This is why, let's understand the following analysis together: 1, will have a dynamic imbalance of water. When the system takes the heat source as an active variable flow control, or who through other means to reduce the flow of the system, the pressure on the pipe network will be reduced, the heat network due to the pressure becomes smaller, the proximal user self-operated flow control valve automatic valve The core will open large, to maintain the original flow constant. Due to the special structure of the flow valve, the change of flow rate causes the characteristic resistance value S of the pipe section to change, and the total characteristic resistance of the network will also change. The distribution proportion of the total flow in each pipe section also changes correspondingly. Near-end and far-end users can not change in proportion to the total traffic. The change of traffic is only the change of traffic of the remote user. This will inevitably result in the thermal network dynamic imbalance, far-end users reach the heat requirements. 2, need to increase circulating water flow increase can not go up. Circulating pumps reduce the outdoor climate, the need to increase the amount of circulating water, the user flow due to self-flow control valve, so that users can not increase traffic. Therefore, whether it is a user-based variable flow heat network or a heat source for the initiative to change the flow of heat network can not be applied self-flow control valve. Self-flow control valve is only suitable for constant flow of quality control system. 3, when the user as required to independently adjust the indoor temperature, self-flow control valve, valve users need to increase the flow, due to restrictions on self-flow control valve, the flow increase; when the valve after the user needs to reduce traffic, the user Will interfere with each other, self-operated flow control valve has become only useless pump power consumption valve. At present, many heating companies choose to convert frequency, multi-pump, less pump, big pump, small pump to achieve variable flow operation, heat network hydraulic balance selection of self-flow control valve is wrong. The installation of self-operated flow control valve heating network can not use variable flow operation mode. Therefore, in the actual production process, we must choose according to the actual needs of self-operated flow control valve.
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