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January 14, 2026
Category Connection: WAGO Connectors
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#Pneumatic Cylinder #photo electric sensor #Danfoss MBS 1650 bypass valve 1/2 to 1 inch
Brief: In this video, we provide an informative overview of the Danfoss MBS 1650 Magnetic Bypass Valve. You'll see how this pressure-independent valve operates within hydronic heating systems, learn about its automatic bypass function that maintains constant differential pressure, and discover its key installation features for protecting variable speed pumps.
Related Product Features:
  • Pressure-independent operation automatically bypasses excess flow to maintain a constant differential pressure across the pump.
  • Designed to protect variable speed pumps from operating against a closed head, extending pump life and preventing noise.
  • Features a robust magnetic pilot system for precise control, which is insensitive to installation orientation.
  • Factory pre-set differential pressure simplifies installation with no field adjustment required.
  • Available in multiple connection sizes from 1/2" to 1" to match various bypass line requirements.
  • Compact design allows for easy installation in bypass lines near hydraulic separators or pumps.
  • Maintenance-free sealed magnetic system ensures long-term reliability without user intervention.
  • Operates within a 0-10 bar pressure range and withstands temperatures up to 120°C.
FAQs:
  • What is the primary function of the Danfoss MBS 1650 Magnetic Bypass Valve?
    The Danfoss MBS 1650 maintains a constant differential pressure across a variable speed pump in hydronic systems by automatically bypassing excess flow, which protects the pump and ensures stable system operation.
  • Is the differential pressure setting on the MBS 1650 adjustable?
    No, the MBS 1650 typically has a fixed, non-adjustable differential pressure setting (e.g., 0.15 bar) that is factory pre-set for typical residential heating systems.
  • What are the available connection sizes for this bypass valve?
    The Danfoss MBS 1650 is available in three connection sizes: DN15 (1/2"), DN20 (3/4"), and DN25 (1"), using union nut compression fittings for copper pipe.
  • Where should the MBS 1650 be installed in a hydronic system?
    It should be installed in the bypass line between the supply and return headers, as close to the pump or hydraulic separator as possible, following the flow direction arrow marked on the valve body.
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