Introduction:

American standard globe valves and flange globe valves belong to the same type of valve, and the closing part is a valve disc. The valve stem rotates around the centerline of the valve body to achieve opening and closing.

Working principle:
A. Opening process

In the closed position, the valve body is subjected to mechanical pressure from the valve stem, pressing tightly against the valve seat.

When the handwheel is turned counterclockwise, the valve stem moves in the opposite direction, and its bottom angular plane causes the ball to detach from the valve seat.

The valve stem continues to lift and interacts with the guide pin in the spiral groove of the valve stem, causing the ball to start rotating 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.

B. Close process

When the valve is closed, rotate the handwheel clockwise, and the valve stem begins to descend, causing the ball to leave the valve seat and start rotating.

Continuing to rotate the handwheel, the valve stem is subjected to the action of a guide pin embedded in its spiral groove, causing both the valve stem and the gate to rotate 90 degrees simultaneously.

When it was about to close, the gate had already rotated 90 ° without contact with the valve seat.

During the last few turns of the handwheel, the angular plane at the bottom of the valve stem mechanically wedges against the pressure ball, tightly pressing it against the valve seat to achieve complete sealing.

Structural features:

1. Open and close without friction. This function completely solves the problem of traditional [wiki] valves [/wiki] affecting sealing due to mutual friction between sealing surfaces.

2. Top mounted structure. Valves installed on pipelines can be directly inspected and repaired online, which can effectively reduce device shutdown and reduce costs.

3. Single seat design. Eliminated the problem of abnormal pressure increase in the cavity medium of the valve, which affects the safety of use.

4. Low torque design. The valve stem with a special structural design can be easily opened and closed with just a small handle valve.

5. Wedge shaped sealing structure. The valve is sealed by the mechanical force provided by the valve stem, which presses the ball wedge onto the valve seat, ensuring that the sealing performance of the valve is not affected by changes in pipeline pressure difference. The sealing performance is reliably guaranteed under various working conditions.

6. Self cleaning structure of sealing surface. When the ball tilts away from the valve seat, the fluid in the pipeline passes evenly along the sealing surface of the ball at a 360 ° angle, not only eliminating the local erosion of the valve seat by high-speed fluid, but also flushing away the accumulation on the sealing surface, achieving the purpose of self-cleaning.