The S6057 series brass valve are primarily designed to regulate the flow of water in response to the demand of a controller in zone and fan coil applications. They can be used in combination with an electric on/off actuator S6056. The valves are availabe in 2 way N.C. (Normally Closed) or 3 way configuations. The 6056 electric on/off actuator provides a two positions (open-closed) control. This compact, spring return actuator has 105N minimum seating force in a compact, easy-to install package.