the FWK-1 series electric actuator and the VW series two-way brass valve are connected by spiral joint. The electric actuator is fixed after the valve installation. On-spot installation and flexible wiring is easy and convenient. The electric actuator 's plane can be fixed close to the wall so that less space is occupied. This is a durable product with reliable performance and low working noise. It can also work stably in the environment of high temperature caused by the hidden fan coil device.