Patent ID: 11879556
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  B  Y | IPC F

Claim 0:
1. A method for manufacturing a check valve unit, the method comprising:
disposing a tube stock in a state of being clamped by outer dies;
fixing the tube stock by pushing shaft pushing tools into the tube stock from both ends of the tube stock;
filling the tube stock with fluid;
forming a valve seat on an inner peripheral surface of the tube stock by further pushing the shaft pushing tools into the tube stock from both ends of the tube stock;
cutting the tube stock to cause the valve seat to form one end portion;
inserting a valve body into the tube stock; and
forming a protruding portion that protrudes inward at an other end portion, the other end portion being on a side opposite to the valve seat.