API 6D Ball Valve ANSI Flanged Ball Valve

Structural features of API 6D Ball Valve ANSI Flanged Ball Valve

1. Open and close without friction. This function completely solves the problem that the traditional valve affects the sealing due to the friction between the sealing surfaces.

2. Top-loading structure. The valve installed on the pipeline can be directly inspected and maintained online, which can effectively reduce the shutdown of the device and reduce the cost.

3. Single valve seat design. It eliminates the problem that the medium in the cavity of the valve affects the safety of use due to abnormal pressure increase.

4. Low torque design. The valve stem with special structure design can easily open and close the valve with only a small handle.

5. Wedge-shaped sealing structure. The valve is sealed by pressing the ball wedge onto the valve seat by the mechanical force provided by the valve stem, so that the sealing performance of the valve is not affected by the change of the pipeline pressure difference, and the sealing performance is reliably guaranteed under various working conditions.

6. Self-cleaning structure of sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline passes evenly along the sealing surface of the ball at 360°, which not only eliminates the local scouring of the valve seat by the high-speed fluid, but also washes away the accumulation on the sealing surface to achieve the purpose of self-cleaning .

In order to reduce the operating torque of the ball valve and increase the reliability of the seal, the oil-sealed ball valve has appeared, which not only injects special lubricating oil between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. Suitable for high pressure and large diameter ball valves.

When opening

1 In the closed position, the ball is pressed against the valve seat by the mechanical pressure of the valve stem.

2 When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular flat makes the ball disengage from the valve seat.

3 The stem continues to lift and interacts with the guide pin in the stem's helical groove, causing the ball to begin to rotate without friction.

4 Until it reaches the fully open position, the valve stem is lifted to the limit position, and the ball rotates to the fully open position.

When closing

1 When closed, turn the handwheel clockwise, the valve stem starts to descend and the ball leaves the valve seat and starts to rotate.

2 Continue to rotate the handwheel, the valve stem is acted by the guide pin embedded in the upper spiral groove, so that the valve stem and the ball rotate 90° at the same time.

3 Just before closing, the ball has rotated 90° without making contact with the seat.

4 During the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges the ball to press it tightly against the valve seat to achieve a complete seal.