| 摘要 |
Plug-type angle valve comprising a valve body and a unitary valve plug formed of a plastic material. The valve body has upper and lower trunnion seats and at least two fluid ports, one being a control port located at a position intermediate the trunnion seats. Another of the ports is an angularly displaced lower port extending through the lower trunnion seat. The valve plug has upper and lower trunnion sections journaled in the trunnion seats and an intermediate spherical control section between the trunnion sections and located adjacent the control port. A control passage extends from a lower opening in the valve plug aligned with the lower port to a second opening in the intermediate section of the valve plug. The valve plug is rotatable between a valve open position in which the section opening in the valve plug is aligned with the control port, position, and a second angular position in which the plug opening is displaced from the control port so that the outer surface of the intermediate section closes the control port.
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