6DR5020 Valve Positioner Enquiries
Pneumatic control-valve positioner offered in Ruoguang’s supplier listing.
View product →Product overview
Burner program-controller reference in Ruoguang’s published offering.
The supplier lists LGB21.330A27 as a burner program-controller enquiry and names several controller families in its description. Select using the burner documentation and full device reference rather than a family name alone. Confirm the required sequence, supply and wiring with Ruoguang for the proposed replacement; an advertised import claim is not independent verification of origin.