| 摘要 |
A valve body includes a poppet type valve member disposed therein and a through hole formed thereto wherein first and second cylindrical synthetic resin retainers are fitted to the through hole. Valve seats are disposed to the end walls of both the retainers confronting each other across the central port, respectively, and a poppet seal portion is disposed to the poppet type valve member in confrontation with both the valve seats so as to open and close the valve seats of the first and second retainers. The diameters of the inner peripheral walls of both the retainers are slightly reduced in the vicinities of the ends thereof on the valve seat sides so that the effective seat diameters of the valve seats are approximately equal to the inner surface diameters of the retainers with which the slide portions of the valve member are in sliding contact.
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