Patent ID: 11867316
Assignee: ADVANCE DENKI KOGYO KABUSHIKI KAISHA
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A flow rate control valve comprising a flow path-side body and a driving-side body, in which
an inflow flow path into which to-be controlled fluid flows, an outflow flow path from which the to-be controlled fluid flows out, and a valve seat located between the inflow flow path and the outflow flow path are formed in the flow path-side body,
a piston cylindrical space in which a piston is placed is formed in the driving-side body,
a valve body is placed on one end of the piston,
an opening is formed in one end of the piston cylindrical space at a position opposed to the valve seat,
a diaphragm is placed in the opening,
the piston cylindrical space and the valve seat are partitioned from each other by the diaphragm, and
the valve body is placed in the diaphragm at a position closer to the valve seat, wherein
the flow path-side body and the valve body are formed from fluorine-based resin made of PEA or PTFE, and
annular or circular seal members made of cross-linked PTFE are joined to a valve body-side abutting portion having the valve seat against which the valve body abuts and to a valve seat-side abutting portion of the valve seat against which the valve body abuts,
wherein at least one of:
(i) the seal member is composed by laminating a cross-linked PTFE sheet on one surface of a PFA film, and
(ii) the PFA film is joined to the valve body-side abutting portion or the valve seat-side abutting portion.