ASCO two position three way electromagnetic valve manualbalancing valve, self-balancing valve. Whether manualbalance or self-balancing valve, their role is to increase the resistance heating system proximal, restrict the flow of the actual operation should not exceed the design flow; in other words, extra information pressure head and its role is toovercome the proximal end of the heating system, the electric control valve or control valve can work under pressure head at a license. Therefore, manual balancing valve and self-balancing valve, they are temperature control valve or electric auxiliary flow control valve regulating device, but it is very important, if the selection of properly, or the unreasonable design, electric control valve or control valve can not work very well. ASCO two position three way electromagnetic valve generalcirculation system is very small, and the working pressure difference is small. For example, electromagnetic valve flowcoefficient is generally 25 caliber than a lot of small electric valve 15 caliber. Solenoid valve driven by electromagneticvalve coil, voltage surge damaged more easily. Equivalent switching function, that is the role of on and off two. Valve electric drive motor is generally used, compare the impact of voltage. Solenoid valve is open and fast speed, usually used in small flow and small pressure to the switching frequency, local electric valve and vice. Electric valveopening can be controlled, the state has to open, closed,half-open half-clearance, you can control the flow of the pipeline and the electromagnetic valve is not up to therequirements. Solenoid valve can be reset general power,the electric valve need to add such features to resetdevice.