Abstract: A lubricant injector and apparatus for lubricating especially chain conveyor rollers where bearings; can be refilled with lubricant via a fitting onto which the injector can be pressed. The injector has a housing inlet for receiving lubricant, and an injector tip for placement on the lubricant fitting. A spring-loaded movable piston actuated with compressed air is disposed in the housing, with the injector tip connected to the movable piston. An annular gap communicating with the inlet is provided between the housing and the movable piston having a discharge side, facing the injector tip provided with a coaxially disposed cylindrical chamber. The movable piston has a bore connecting annular gap and the cylindrical chamber.

Abstract: A pressure controlled 4/2 way valve, particularly for the alternating control of the feed conduits of two conduit - lubrication systems. Three cylindrical spaces are formed in a housing connected by channels with one another and each contain a piston for the automatic control of medium flowing therethrough. The pistons are each displaceable between two end positions, one piston functioning as a control piston, a second as an auxiliary control piston, and the third as a reception piston. One feed conduit is connected respectively on each side to the cylindrical space for the reception piston. A pressure relief valve for hydraulic precontrol is disposed in the flow path between a pressurized conduit connection and the cylindrical space for the reception piston.