There are many kinds of structures of ball valves, but they are basically the same. They are all ball cores whose opening and closing parts are round. They are mainly composed of valve seat, sphere, sealing ring, valve stem and other driving devices. The valve stem is rotated 90 degrees to achieve The opening and closing of the valve is used on the pipeline to shut off, distribute, adjust the flow rate and change the flow direction of the medium. The valve seat uses different seat sealing forms according to different working conditions. Inside the valve body of the O-type ball valve is a sphere with a central through hole. The sphere has a through hole with a diameter equal to the diameter of the pipeline. The sphere can rotate in the sealing seat. body to achieve sealing. The ball core of the V-type ball valve has a V-shaped structure. The valve core is a 1/4 spherical shell with a V-shaped notch. It has large flow capacity, large adjustable range, shear force, and tight closing. Material with fibrous conditions.
O-type ball valve:
Inside the valve body of the O-type ball valve is a sphere with a central through hole. The sphere has a through hole with a diameter equal to the diameter of the pipeline. The sphere can rotate in the sealing seat. body to achieve sealing. By rotating the ball 90°, the direction of the through hole can be changed, thereby realizing the opening and closing of the ball valve. The O-type ball valve adopts a floating or fixed design, and the relative moving parts are made of self-lubricating materials with a very small friction coefficient, so the operating torque is small. In addition, the long-term sealing of the sealing grease makes the operation more flexible. The advantages of the product are as follows:
1.O-type ball valve has low fluid resistance
Ball valves generally have two structures of diameter and reduced diameter. No matter which structure, the flow resistance coefficient of the ball valve is relatively small. The conventional ball valve is a straight-through type, also known as a full-flow type ball valve. The diameter of the channel is equal to the inner diameter of the pipe, and the resistance loss is only the frictional resistance of the pipe of the same length. Of all the valves, this ball valve has the least fluid resistance. There are two ways to reduce the resistance of the pipeline system: one is to reduce the fluid flow rate by increasing the diameter of the pipe and the valve, which will greatly increase the cost of the pipeline system. The second is to reduce the local resistance of the valve, and the ball valve is the best choice.
2.O-type ball valve switch is fast and convenient
The ball valve only needs to be rotated 90° to complete the full opening or full closing, so it can be opened and closed quickly.
3. O-type ball valve has good sealing performance
The vast majority of ball valve seats are made of elastic materials such as PTFE, which are usually called soft-sealed ball valves. The soft-sealed ball valve has good sealing performance, and the requirements for the roughness and machining accuracy of the sealing surface of the valve are not very high.
4. O-type ball valve has a long service life
Due to the good self-lubricating properties of PTFE or F4, the friction coefficient with the sphere is small. Due to the improved processing technology, the roughness of the ball is reduced, thereby greatly improving the service life of the ball valve.
5. O-type ball valve has high reliability
A pair of sealing pairs between the ball and the valve seat will not suffer from scratches, rapid wear and other failures;
After the valve stem is changed to the built-in type, the hidden accident hazard that the valve stem may fly out due to the loosening of the packing gland under the action of fluid pressure is eliminated;
The ball valve with anti-static and fire-resistant structure can be used for pipelines for transporting oil, natural gas and gas.The valve core (ball) of the O-type ball valve is spherical. From the structural point of view, the ball valve seat is embedded on the valve seat side of the valve body during sealing. The relative moving parts are made of self-lubricating materials with extremely small friction coefficient, so the operating torque is small. In addition, the long-term sealing of the sealing grease makes the operation more flexible. Generally used for two-position adjustment, the flow characteristic is quick opening. When the O-type ball valve is fully opened, the two sides are unobstructed, forming a straight pipe channel, with two-way sealing, which is suitable for two-position cut-off occasions that are particularly unclean and fibrous media. The ball core always produces friction with the valve during the opening and closing of the valve. At the same time, the sealing between the valve core and the valve seat is achieved by the pee-tightening sealing force of the valve seat against the ball core, but due to the soft sealing valve seat, Excellent mechanical and physical properties make it well sealed.
V-type ball valve
The ball core of the V-type ball valve has a V-shaped structure. The valve core is a 1/4 spherical shell with a V-shaped notch. It has large flow capacity, large adjustable range, shear force, and tight closing. Material with fibrous conditions. In general, V-type ball valves are single-sealed ball valves. Not suitable for bidirectional use.
V-shaped edge, cut off impurities. During the rotation of the ball, the V-shaped knife edge of the ball is tangent to the valve seat, thereby cutting off the fibers and solid substances in the fluid, while the general ball valve does not have this function, so it is easy to cause the fiber impurities to get stuck when closing, which is necessary for maintenance and repair. Maintenance brings great inconvenience. The spool of the V-type ball valve will not be stuck by the fiber. In addition, due to the use of flange connection, it is easy to disassemble and assemble, no special tools are required, and maintenance is also simple. when the valve is closed. There is a wedge-shaped scissors effect between the V-shaped notch and the valve seat, which not only has a self-cleaning function but also prevents the ball from being stuck. Stem spring, therefore, the operating torque is small and very stable.
V-shaped ball valve is a right-angle rotation structure, which can realize flow regulation. It can achieve different degrees of proportionality according to the V-shaped angle of the V-shaped ball. V-shaped ball valves are generally used in conjunction with valve actuators and positioners to achieve proportional adjustment. V-shaped valve core is most suitable for various adjustment occasions, with large rated flow coefficient, large adjustable ratio, good sealing effect, zero-sensitive adjustment performance, small size, and can be installed vertically. Suitable for controlling gas, steam, liquid and other media. The V-type ball valve is a right-angle rotary structure, consisting of a V-type valve body, a pneumatic actuator, a positioner and other accessories; it has an inherent flow characteristic of approximately equal percentage; it adopts a double-bearing structure, with low starting torque and excellent performance. Sensitivity and induction speed, super shearing ability.
Post time: Oct-26-2022