5141A-NC / 5142A-NO IBR 2 -WayIBR 2-Way Pneumatic Control Valves with Multispring Actuator.(Normally Close & Normally Open Design) Design as per Indian Boiler Regulation-1950 GET PDF GET PDF 7941A-NC / 7942A-NO IBR 2 -WayIBR 2-Way Pneumatic On-off & Control Valves with Multispring Diaphragm Actuator.(Normally Closed Design & Normally Open)Design as per Indian Boiler Regulation-1950 Field Reversible from Normally Close GET PDF GET PDF