Valve operates without minimum pressure differential

They also require only a minimum amount of pressure to activate the keys.

Because of this they require a minimum operating pressure differential to operate.

The pressure difference across the valve is higher than the minimum operating pressure differential.

They are characterised by their high flow volume rate and the thereby resulting minimum pressure difference.

Servoassisted solenoid valves operating on the basis of this design require a minimum pressure differential for correct opening and closing.

The arrangement requires a minimum pressure differential between a surrounding atmosphere and the airways of the inhaling person in order to open the inlet for outside air to enter into the DPI.

In addition, the membrane (20, 20') is controlled by a drain valve spring (28) which maintains a minimal pressure differential between the inlet pipe (1') and the central chamber (6).

An important concept in check valves is the cracking pressure which is the minimum differential upstream pressure between inlet and outlet at which the valve will operate.