Flow rate control apparatus
AssigneeSMC Corporation
InventorKenji Shishido
Life of this patent
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Abstract
A flow rate control apparatus includes a valve mechanism capable of controlling a flow rate of a pressure fluid that flows from a second port to a first port. Second stopper walls are formed on a seating section of a needle valve constituting the valve mechanism and which is capable of advancing and retracting in an axial direction. In addition, in a total valve-closed state when the seating section of the needle valve is seated on a seat of a first body, the second stopper walls come into abutment and are stopped in a circumferential direction of the needle valve with respect to first stopper walls of the first body.
Claims7
A flow rate control apparatus, which is capable of controlling the flow rate of a fluid that flows between a pair of ports, by displacement of a rod having a valve member thereon in an axial direction, comprising:
- a body having the ports and a seat on which the valve member is seated, the rod being screw-engaged rotatably in the body;
- and
- a stopper disposed on the body and the rod, and which regulates rotational displacement of the rod in a valve-closed state in which the valve member is seated on the seat, wherein the body and the rod are both formed from a resin material, wherein the stopper comprises first walls formed substantially parallel with an axis of the body and adjacent to said seat, and second walls disposed on the rod and formed substantially parallel with an axis of the rod, wherein rotational displacement of the rod is regulated by abutment of the first walls against the second walls, and
- wherein the valve member shuts off the flow of fluid between the pair of ports before the rod is displaced in the axial direction to the valve-closed state in which the valve member is seated on the seat, and wherein the abutment of the first and second walls of the stopper stops rotation of the rod toward the valve-closed state after the valve member shuts off the flow of fluid between the pair of ports and before the rod is displaced in the axial direction to the valve-closed state in which the valve member is seated on the seat.
Dependencies are inferred from the claim text.