Abstract: A gear pump having three gears, including; a pump case consisting of a pump body and a cover for covering most of the body; three gears which are supported by a rotating shaft on the pump case and engaged with each other in series; first and second gear pumps each composed of one central drive gear and one of the driven gears on both sides of the drive gear; a non-return valve and a flow regulation valve which are opened at a predetermined pressure; an inlet port which is opened at one end of the pump case and connected through a feed path to the suction side of the two gear pumps; an outlet port formed on the discharge side of the first gear pump in the pump case; a regulation path passing from the discharge side of the second gear pump through the non-return valve to the outlet port; and a flow regulation path passing from the regulation path through the flow regulation valve to an oil pan.

Abstract: The present invention provides a process for producing a capsule containing a substance which is liable to acid, water or heat, comprising: suspending a substance which is liable to acid, water or heat in a hydrophobic substance which is non-flowable at ambient temperature; encapsulating the resulting suspension; air-drying the resulting capsule at ambient temperature; and vacuum drying or vacuum freeze-drying the air-dried capsule. A capsule obtained by the process is also disclosed.