The Cartridge-Type Fixed-Displacement Valve is a new generation of accurate fixed-displacement valve based on a new concept. The fixed displacement chamber is a replaceable container device housed within the aluminum valve body. The fixed displacement chamber has three setting volumes: 0.025, 1.00, and 10.00 cm³.3The oil feeding quantity can be adjusted freely within the specified range. The speed of precise feeding depends on the material's viscosity and pressure, and it can be easily adjusted by simply replacing the precise feeding chamber.