high platform Ball valve and flange gate valve is belong to the same type of valve, the difference in its closure is a ball, the ball around the center line of the body as a rotation to achieve a kind of open and close the valve. Ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium.

Advantage:

1. The fluid resistance is small, its resistance coefficient with section of equal length.

2. Simple structure, small volume, light weight.

3. Compact and reliable, the widespread use of plastic ball valve sealing surface of materials, good sealing, also has been widely used in the vacuum system.

4. Easy to operate, open and close quickly, from open to close just rotate 90 °, is advantageous for the remote control.

5. Easy maintenance, simple structure of ball valve, sealing ring, which generally remove replacement is more convenient.

6. In the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation, medium through, can not cause the valve sealing surface erosion.

7. Applicable scope is wide, size from small to several millimeters, big to a few meters, from high vacuum to high pressure can be applied. Ball rotated 90 degrees in the inlet and outlet should be completely present spherical, thereby blocking flow.

High platform ball valve is a relatively new type of ball valve type, it has its own unique structure some advantages, such as switch frictionless, seal is not easy to wear and open-close torque is small. Which can reduce the distribution of the specifications of the actuator. With multi-turn electric actuators, which can realize to adjust the medium and carefully cut off. Widely used in petroleum, chemical industry, urban water supply and drainage and other demanding cutting conditions.

working principle:

A, open the process

1 in the closed position, the sphere of stem [/ wiki] [wiki] machinery pressure function, press the seat.

2 when turn the handwheel counterclockwise, the valve stem is reverse movement, the Angle at the bottom of the plane to make the ball off the seat.

3 stem continue to ascend, and valve stem guide pin of interaction in the spiral groove, the sphere began to rotate without some friction.

Until 4 to full open position, the valve stem to limit position, sphere rotation to the full open position.

B, the closing process

1 closing, rotating the handwheel clockwise, stem began to drop and the ball left seat begin to spin.

2 continue to rotate the handwheel, the valve stem is embedded in the spiral groove on the role of the guide pin, the stem and ball rotate 90 ° at the same time.

3 is close to closing, the sphere has been without contact with the valve seat rotated 90 °.

4 wheel rotation of the last few laps, stem mechanically wedge Angle at the bottom of the plane to the oppression of a sphere, make its strong pressure on the seat, to completely seal.