Pneumatic device for activating a flush tank drain valve assembly

摘要

The device has an extensible pneumatic actuator assembly (15) for raising a shutter (10) of a flush tank valve assembly from a closed position to an open position when air is fed into the assembly (15). Air is fed to and flows back from the assembly (15) along two pipes (16,17). A delaying unit in the form of an elastically deformable disk with jagged edge delays backflow of air along pipe (17).