Imported pneumatic eccentric hemispherical valve (PQ640F, PQ640H) has the characteristics of frictionless switch, seal is not easy to wear, small opening and closing torque, etc., the use of hemisphere around the eccentric shaft rotation control pipeline medium, in the process of switching, the ball and the valve seat sealing surface frictionless, reduce seal wear, improve service life. Because the structural principle of the pneumatic eccentric hemispherical valve is very similar to the operation form of the three eccentric butterfly valves, some people call the eccentric hemispherical valve a spherical disc butterfly valve.
Features of imported pneumatic eccentric hemispherical valve (PQ640F, PQ640H):
1.The ball body of the PQ640H pneumatic eccentric ball valve is completely separated from the valve seat, which eliminates the wear of the seal and overcomes the problem of the traditional ball valve seat and the sealing surface of the ball body are always worn. The non-metallic elastomeric material is embedded in the metal seat, and the metal surface of the seat is well protected.
2. The V-shaped incision of the pneumatic eccentric ball valve has a cutting function, which can cut off the debris (branches, textile bags, etc.) in the medium. When closed, make sure the valve opens and closes normally.
3. The valve hemisphere is made of bimetal, the base metal is surfacing with different alloys, the valve seat is also specially treated, and the sealing surface is combined into anti-corrosion, wear-resistant, high-strength and other types to meet the needs of different occasions.
4. Pneumatic eccentric rotary valve is especially suitable for slurry and medium containing fiber medium and tiny solid suspended solids, and is widely used in the switch cut-off or flow regulation of petroleum, chemical, paper, sewage treatment and other pipelines.
Imported pneumatic eccentric hemispherical valve (PQ640F, PQ640H) principle
The offset size of the center line of the hemisphere of the pneumatic eccentric hemisphere valve and the center line of the valve stem is completely separated from the offset size of the center line of the valve seat, and the ball and the valve seat are completely separated when fully opened, and there is a certain gap. The radius of rotation is divided into long radius and short radius. The cutting line of the long-radius rotation trajectory forms 6 angles with the seat sealing surface. When the valve is opened and closed, the hemisphere has the effect of gradually separating and gradually squeezing the surface of the valve seat, which reduces the mechanical wear and abrasion between the valve seat and the hemisphere, and improves the service life.