| 摘要 |
<p>HIGH-PRESSURE BALL VALVE WITH INTERNAL PRESSURE EQUALIZATION A fluid control valve includes a valve body having an inlet and an outlet and a control member in the valve body externally operable by a movable operating member. The control member is pivotable between open and closed positions for selectably controlling fluid flow between the inlet and the outlet. The control member has a passage therethrough for selectably permitting fluid to flow from the inlet to the outlet when the control member is in the open position. A conduit is provided through the control member and has a first end and a second end, the first end being in fluid communication with the inlet and the second end being in fluid communication with the outlet when the control member is in the closed position. A secondary valve is provided at the conduit first end and is operable between open and closed positions for selectably opening and closing the first end of the conduit independent of movement of the operating member.</p> |
