Danfoss' HP28 comes with both components. There is no need to purchase the valve or actuator separately. A 2-port actuator (HPA2) and a 28mm valve body (HPV28) make up the HP28 set. The HPA2 actuator is a well-liked component since it can be installed quickly and directly replaces the Sunvic SZ2301 actuator. Using the provided screws, the actuator is easily attached to the valve body on site. Depending on the situation, the actuator can be installed vertically or horizontally. The valve body includes two self-cleaning positive shut-off shoes, and flow through the two ports of the heating system is directionally interchangeable (as required) Auxiliary switches and a single switch are both on the spring return actuator.