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144R11 is a spring return damper actuator designed for emergency damper closure in HVAC and industrial systems
503U - Double gas valve 2" BSP
the actuator combines safety shut-off with outlet pressure regulation (constant pressure governor)
This drives the piston to open the gas valve against the return spring
For further information regarding the Siemens SQM53
Siemens VGD40.125 DN125 Double Gas Valve model_skp55_001e2 144R11 is a spring returnSiemens VGD40. 125 Double gas valve, DN125, 580m h Siemens Part Number: BPZ: VGD40. 125 Compact VGD40. 125 doublevalve bodies consist of 2 safety shut off valves in series. Each individual safety shut off valve has double seats to achieve high flow. Patented seat construction with individual closing spring for each seat to assure reliable shut off and high close off pressure rating. Full port vent line connection plates are available. Siemens VGD40.