Sen Weier SASV40 Series series of electric valve from the valve drive and the SAS4000 SAS4000 series copper valve. Cold or hot water is used to control air-conditioning system turned on or off the pipe, to control room temperature purposes. Drive by the one-way hysteresis synchronous motor, the valve spring return. When the valve does not work in a normally closed state, when the need to work by the thermostat to provide a turn signal to the electric valve connected to AC power and action, open the valve, chilled water or hot water into the coil, to provide room air-conditioning or heating when the temperature reaches the thermostat setting, the thermostat off of electric valve, the valve return spring to close, thus cutting off the flow of water into the fan coil. Through the valve closing and opening, the thermostat temperature is always maintained at the set temperature range. 
 SASV40 series of electric valve drive and valve cover with screw connection, it can be installed in the valve, then install the drive, on-site assembly, wiring flexibility and convenience. The graphic design can drive close to the wall installation, small footprint. Reliable and durable products, work, low noise, and fan coil unit can be concealed within the high temperature often occur reliably.