lungstyrd valve for andningsskyddsmasker with overtryck in the worm's single room

摘要

In known lung-controlled valves, the positive pressure in a breathing connection is established by the fact that the control diaphragm of the valve is tensioned by spring force. There, however, the opening force brought about by the spring is greatest when the inlet valve is closed, while it is smallest when the inlet valve is completely open. To keep the opening force as small as possible with the valve closed, and to leave the opening force approximately unchanged with increasing opening of the inlet valve, a magnet is provided on the inside of the housing cover of the lung-controlled diaphragm and the control diaphragm comprises a magnetizable part which is held at a minimum distance from the magnet by spacers when the inlet valve is closed.