Method for manufacturing control valve, and control valve and valve body assembly

A method for manufacturing a valve body assembly of a control valve, comprising:

• forming a housing, wherein the housing comprises an annular side wall, the housing is provided with an accommodating cavity, the housing is provided with a first communication port, and the first communication port extends through the annular side wall and is in communication with the accommodating cavity;
• and
• fixedly connecting a sealing assembly to the housing, wherein the sealing assembly is fixed to an inner surface of the annular side wall, the sealing assembly comprises a second communication port, the second communication port corresponds to and is in communication with the first communication port after the sealing assembly and the housing are fixedly connected to form an integral structure, and the sealing assembly is sealingly connected to the inner surface of the annular side wall;
• wherein the sealing assembly comprises an elastic member and a sealing member;
• the elastic member is located between the sealing member and the annular side wall;
• wherein the second communication port comprises a first sub-opening and a second sub-opening, wherein the first sub-opening extends through the elastic member along a thickness direction of the elastic member;
• the second sub-opening extends through the sealing member along a thickness direction of the sealing member,
• wherein the fixedly connecting the sealing assembly to the housing comprises:
• forming the sealing member, wherein the second sub-opening is formed in the sealing member;
• assembling the sealing member with the inner surface of the annular side wall, wherein a gap is reserved between the sealing member and the annular side wall;
• pouring a melted material of the elastic member into the gap between the sealing member and the annular side wall;
• and
• pressurizing and heating the melted material of the elastic member, the sealing member and the annular side wall, so as to form the elastic member and fixedly connect the sealing assembly to the inner surface of the annular side wall to form an integral structure.