Fire Protection
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Model AMD-75


The Bermad AMD Air Maintenance Device is a pressure control unit that automatically regulates the supplied air pressure to a constant preset value. It is suited for use with dry pilot actuated Deluge systems as well as Dry Pipe and Pre-action systems. The AMD shall be utilized in applications where there is a compressed air or nitrogen source, which is provided at a higher

pressure than the desired system pressure, including a field adjustable pressure regulator. The supply system shall include an air tank, (separately provided) connected to specific port.

Features and Benefits


Stainless Steel 316 accessories and fittings

  • Maximum Inlet Air (or Nitrogen) Supply Pressure:  12/bar/175 psi
  • Field-Adjustable Outlet Pressure range:  1.0 to 7.0 bar/15 to 100 psi



  • Stainless Steel back plate panel 
  • Brackets for direct mounting on Bermad Deluge Valve
  • Air tank, Stainless steel (Code AT)
  • Inlet and outlet pressure gauges (Code 6n6n)
  • Pressure Switch Low, Ex. proof (Code P7)
  • Pressure Transmitter, Ex. proof (Code Q)


Principle of Operation: 


The AMD Air Pressure Maintenance Device regulates and restricts airflow. The N.C. By-Pass Valve [1] in the AMD is opened to instantly fill the system during the initial pressurization. Once the required system pressure has been reached, the By-Pass Valve will be closed and locked with a Tamper-Proof arrangement to allow restricted airflow through the fixed orifice. The Air Supply Isolating Valves [2] must be in the open position to place the AMD in the automatic operation mode. If a small leak in the system occurs, the Pressure Regulator [3] will automatically maintain system pressure at the preset level. The Restriction orifice [4] in the tube fitting limits the flow of air from the Pressure Regulator into the system to a value, which is significantly lower than it will be exhausted by a release device operation. The device will maintain air pressure in the system for a limited period of time in the event that the air supply is interrupted