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  This steam valve contains a pressure‑set check valve. When the    
     pressure exceeds the set value, the check valve compresses to 
     release pressure, providing overpressure protection.
     It is commonly used in espresso machines or other equipment  
     requiring pressure relief.
     Pressure setting range: 3.5bar ~ 6bar.
     When system pressure ≤ 3.5bar, the pressure relief port does not 
     release water or only drips slowly.
    When system pressure ≥ 6bar, the pressure relief port opens to 
    release  steam.