Ball valve structure:
There are many types of ball valves, but they are basically similar. The main components include the valve seat, ball, sealing ring, valve stem and other driving devices. The valve is opened or closed by rotating the valve stem 90 degrees. It is used in pipelines to shut off, distribute, regulate flow rate and change the direction of the medium. Different valve seat sealing forms are used according to different working conditions. The valve body structure includes one-piece, two-piece and three-piece types.
Structure of O-type ball valve:
Inside the valve body of an O-type ball valve, there is a ball with a central through hole. The ball has a through hole with a diameter equal to that of the pipeline. The ball can rotate in the sealing seat. There is a ring-shaped elastic body on each side of the pipeline direction to achieve sealing. By rotating the ball 90°, the direction of the through hole can be changed, thereby achieving the opening and closing of the ball valve.
The valve core (ball) of the O-type ball valve is spherical. From a structural perspective, when sealed, the ball valve seat is embedded in the side valve seat of the valve body. The relative motion parts all use self-lubricating materials with extremely low friction coefficients, so the operating torque is small. In addition, the long-term sealing of the sealing grease makes the operation more flexible. Generally, it is used for two-position regulation, and the flow characteristic is quick opening.
Principle of O-type ball valve:
When the O-type ball valve is fully open, both sides are unobstructed, forming a straight pipe channel. It is bidirectionally sealed and has the best "self-cleaning" performance. It is suitable for two-position cut-off applications with particularly dirty and fibrous media. During the opening and closing of the valve, the ball core always rubs against the valve. Meanwhile, the seal between the ball core and the valve seat is achieved through the pre-tightening sealing force exerted by the valve seat on the ball core. However, due to the excellent mechanical and physical properties of the soft-seal valve seat, its sealing performance is particularly outstanding.
V-type ball valve structure:
The V-type ball valve has a V-shaped structure on the ball core. The valve core is a 1/4 ball shell with a V-shaped notch. It has a large flow capacity, a wide adjustable range, and a shearing force. It can be tightly closed and is particularly suitable for applications where the fluid contains fibrous materials. Generally, V-type ball valves are single-sealed ball valves and are not suitable for bidirectional use.
The edge of the valve core is V-shaped, and there is a V-shaped opening on the ball. As the ball rotates, the flow rate can be adjusted by changing the opening area in the middle, and it can also cut off impurities mixed in the fluid and close tightly. It is suitable for controlling pulp, mortar, and viscous fluids.
Principle of V-type ball valve:
The V-shaped edge cuts off impurities. During the rotation of the ball, the V-shaped cutting edge of the ball and the valve seat are in contact, thereby cutting off fibers and solid substances in the fluid. Ordinary ball valves do not have this function, which easily leads to the jamming of fibers and impurities when closing, causing great inconvenience for maintenance and repair. The valve core of the V-type ball valve will not be jammed by fibers. In addition, due to the adoption of flange connection, it is easy to disassemble and assemble without special tools, and maintenance is also simple and convenient. When the valve is closed, the V-shaped notch and the valve seat produce a wedge-shaped scissor effect, which not only has a self-cleaning function but also prevents the ball core from getting stuck. The valve body, valve cover and valve seat respectively adopt a metal point-to-point structure, and a valve stem spring with a small friction coefficient is used. Therefore, the operating torque is small and stable.