SELF-WEIGHT PRESSURE CONTROL VALVE, LIQUID SUPPLY SYSTEM INCLUDING THE SAME, AND INKJET RECORDING DEVICE

摘要

A self-weight pressure control valve includes a hollow case main body with an opening, a partitioning wall dividing the case main body into first and second pressure chambers in communication with the opening, a communication opening in the partitioning wall and communicating the first pressure chamber and the second pressure chamber to each other, a valve rod including a rod portion inserted through the communication opening to pass the partitioning wall, and a valve portion located in the first pressure chamber, and a pressure sensitive film covering the opening of the case main body, coupled with a tip of the rod portion of the valve rod, and flexibly deformable toward the rod portion. When the pressure sensitive film is not flexibly deformed toward the rod portion, the communication opening is maintained in a closed state by the valve portion by use of a self-weight of the valve rod.

主权项

1. A pressure control valve located on a liquid supply path usable to supply a liquid from a liquid supply to a liquid injection head, the pressure control valve comprising:
a housing including an opening that connects a first pressure chamber and a second pressure chamber to each other, and a wall that divides an inner space of the housing into the first pressure chamber and the second pressure chamber in communication with the opening; an inlet in the housing that communicates with the first pressure chamber; an outlet in the housing that communicates with the second pressure chamber; a valve rod that has an outer diameter smaller than an inner diameter of the opening, and a valve that has an outer diameter larger than the inner diameter of the opening and is located in the first pressure chamber; and a pressure sensitive film that is attached to the housing to cover the opening, is coupled with the valve rod, and is deformable; wherein the first pressure chamber is located above the second pressure chamber; and the opening is maintained in a closed state by the valve rod when the pressure sensitive film is not deformed toward the valve rod.