Valve and dispenser where the valve switches in response to pressure at the inlet and the outlet

摘要

Disclosed is a valve (10) and a dispenser containing the valve. The valve has an inlet (11) and an outlet, and a valve element moveable between a first equilibrium position and a second open position, wherein when the valve element is in the first position, the inlet and the outlet are not in flow communication and when the valve element is in the second position the inlet and the outlet are in flow communication. The valve element is moveable reversibly from the first position to the second position and back by opposing fluid pressures at the inlet and the outlet.