Danfoss actuator (003H6828) — genuine PN 25 spare assembly for the Danfoss self-acting controller range. It is the diaphragm actuator / setting-spring "top works" that mounts on the controller valve body: the actuator senses the controlled differential pressure through the Ø6 mm copper impulse tubes and modulates the valve cone, and the adjustment part carries the setting spring that fixes the working range. Fits Danfoss AVPQ4 controllers, flow (controller installed in the flow/supply pipe). OEM designation "Actuator PN25 intermed. Net weight 1.528 kg. Contains lead per the REACH candidate list. OEM P/N 003H6828. Technical data quoted verbatim from store.danfoss.com (code 003H6828). Used in commercial refrigeration, provision-room cooling and reefer plant rooms across HFC, HFO and CO2 (R744) refrigerants.