Method and apparatus for delivering predetermined amounts of fluids

An apparatus for delivering a predetermined amount of a fluid, the apparatus comprising:

• i) a means for pressurizing said fluid,
• ii) a pressure feed passageway through which said pressurized fluid passes, and
• iii) a dispenser located in said pressure feed passageway, said dispenser being provided with:
• a) a rotatable shaft provided with a passageway part formed therethrough, which constitutes part of said pressure feed passageway,
• b) a cylindrical part of a housing, which cylindrical part is fitted outside of said rotatable shaft such that said rotatable shaft can rotate therein,
• c) a seal member which is constituted of a resilient material, said seal member being located between said cylindrical part of the housing and said rotatable shaft, said seal member including a portion of said pressure feed passageway passing therethrough and located outside of said passageway part,
• d) an operation means for rotating said rotatable shaft, and
• e) a control means for controlling said operation means in order for said rotatable shaft to be rotated to an orientation, in which said passageway part communicates with said portion of said pressure feed passageway passing through said seal member and located outside of said passageway part, and to an orientation, in which said passageway part does not communicate with said portion of said pressure feed passageway passing through said seal member and located outside of said passageway part.

An apparatus for delivering a predetermined amount of a fluid, the apparatus comprising:

• i) a means for pressurizing said fluid,
• ii) a pressure feed passageway through which said pressurized fluid passes, and
• iii) a dispenser located in said pressure feed passageway, said dispenser being provided with:
• a) a rotatable shaft provided with a passageway part, which constitutes part of said pressure feed passageway,
• b) an operation means for rotating said rotatable shaft, and
• c) a control means for controlling said operation means in order for said rotatable shaft to be rotated to an orientation, in which said passageway part communicates with said pressure feed passageway outside of said passageway part, and to an orientation, in which said passageway part does not communicate with said pressure feed passageway outside of said passageway part;
• wherein said dispenser is further provided with:
• a cylindrical part of a housing, which cylindrical part is fitted outside of said rotatable shaft such that said rotatable shaft can rotate therein,
• a seal member which is constituted of a resilient material and has a convex conical edge surface, which edge surface is taken in the axial direction, said seal member being located between said cylindrical part of the housing and said rotatable shaft such that an outer circumferential surface of said seal member is in contact with an inner circumferential surface of said cylindrical part of the housing, and an inner circumferential surface of said seal member is in contact with an outer circumferential surface of said rotatable shaft, and
• a seal pushing member having a concave conical pushing surface, which corresponds to said convex conical edge surface of said seal member and which pushes said convex conical edge surface of said seal member along the axial direction.