Abstract: An improved airlock valve is shown which is used to pass a particulate solid from a first pressure environment to a second, different pressure environment. The valve includes an inlet chamber for receiving particulate solids entering at a first pressure and has an outlet chamber for receiving particulate solids passing from the inlet chamber. The outlet chamber has a discharge opening which communicates with a second pressure environment which is different from the first pressure environment. At least one baffle divides the inlet chamber and the outlet chamber. Compressed air is supplied to the lower regions of the inlet and outlet chambers by means of a supply tube having downwardly facing apertures in order to fluidize the particulate solids.

Abstract: An electrical kitchen appliance, such as a garbage disposal unit, is operated by providing a pneumatically actuated switch which prevents the user from being shocked due to the presence of water in the area. The pneumatic switch can be moved between an on and an off position so that electrical current is supplied or cut off from the appliance. A non-electrically conductive air conduit is connected to the switch and leads to a remote location from the appliance. A bellows is supplied at the remote location and forces air through the conduit to the pneumatic switch, switching the appliance on or off. Because the bellows is not electrically connected to the switch and is located at remote distance, electrical shock due to the presence of water is eliminated.