Stay open metal sealing ball valves for combination sphere. The room for wedge cone, on both sides of the 5 ° slope, on both sides of the inclined plane for a two spherical disc. Spherical disc and cone through the dovetail groove or T slot connection between mutual sliding. Spherical disc above and below co., LTD., a ring and adjustment respectively mat limit, make its can't with wedge cone up or down, only in a level within the space with wedge cone do translation or rotary movement. The lower end of the stem by thread and pin shaft and wedge cone solid for an organic whole, top trapezoidal thread and stem nut to cooperate, the rotation of the stem nut by hand wheel, bevel gear, electric or pneumatic device driver. Central stem with track pin, pin at each end of the pack a roller, roller can be in support of the guide grooves, stem trajectory by guide groove limit.
When the valve to be closed, clockwise rotate handwheel, drive stem nut rotation, stem nut drive valve stem and wedge cone rotating 90 ° to the valve closed position, and then to the side translation open, rely on to the body sealing surface, the realization of the valve closed. When the valve need to open, counter clockwise rotation handwheel, through the stem nut and stem, drive wedge cone rise, make the ball valve to intermediate collapsed from the body sealing surface, and then wedge cone drive the ball valve rotate 90 ° open the valve.
Stay open metal seal valve movement trajectory of the characteristics of both the gate (rotating) and has the characteristics of ball valve (turn 90 °), so its performance has both the advantages of gate valve and ball valve has the advantages. Stay open metal seal valve structure and orbit than ball valve, there are both same and different points.
 

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