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one A valve together with V1 as internal bypass around V2 + regulator
Max Reaction Time For Air Proving Switch: 60s
-10 C / +80 C for air
and they can be used for air upon request
the actuator combines safety shut-off with ratio pressure control to maintain an air-gas ratio across the load range
Siemens LDU11.323A27 230v Burner Control Box Econex_VSC one A valve together withSiemens LDU11. 323 A27 230V Siemens Part Number: BPZ: LDU11. 323 Overview The LDU11. 323A27 control box valve proving system is designed for use with shutoff valves in connection with gas burners and gas appliances. In the event of inadmissible leakage, the system prevents the burner from starting up. The LDU11. 323A27 system conforms to the requirements of EN1643 covering automatic shutoff valves for use with gas burners and gas appliances to EN161.
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