Preset Overpressure Valve
An overpressure valve is a one way check valve that installs on the outflow blast valve of your shelter or safe room
The overpressure valve is normally closed and will not open unless the air pressure inside the shelter is slightly greater than the outside air pressure. It opens when the Safe Cell is turned on and gives a little back pressure to the Safe Cell to help it create and maintain the positive pressure.
This gives you true ventilation – air in through the Safe Cell and out through this valve. This replenishes the oxygen and removes the carbon dioxide exhaled by the occupants.
The overpressure valve must be oriented so it points at the floor because it partially uses gravity to keep the synthetic rubber diaphragm closed. We include both wall and ceiling adapters. All joints between the overpressure valve, the adapters, and the blast valve are slip fit so they can be assembled or disassembled for cleaning or servicing without tools. It can be attached directly to the inside wall or ceiling or on a blast valve.
What’s included with this item
- One overpressure valve (center item)
- One wall mount flange and gasket (items on right)
- One 90 degree wall mount adapter (top left)
- One ceiling adapter (bottom left)
- One hard copy of the manual.