This article tells us about the differences between O-type ball valves and V-type ball valves.
The structure of ball valves
There are many types of structures for
ball valves, but they are the same.
They are all-around ball cores with opening and closing parts, which are mainly composed of valve seats, balls, sealing rings, valve stems, and other driving devices. The
valve can be opened and closed by rotating the valve stem by 90 degrees. They are used in pipelines to shut off, distribute, regulate the flow, and change the flow direction of the medium. The valve seat uses different sealing forms according to different working conditions. The valve body of the O-ring ball valve is equipped with a ball with an intermediate through-hole inside. There is a through-hole with a diameter equal to the pipeline diameter on the ball, which can rotate in the sealing seat. There are circular elastomers on both sides of the pipeline direction to achieve sealing. The V-shaped ball valve core has a V-shaped structure, and the valve core is a 1/4 ball shell with a V-shaped notch. It has a large flow capacity, a large adjustable range, and a shear force. It can be tightly closed, making it particularly suitable for fluid materials with fibrous structures.
A. The structure of O-type ball valves
The valve body of the O-ring ball valve is equipped with a ball with an intermediate through-hole inside. There is a through-hole with a diameter equal to the pipeline diameter on the ball, which can rotate in the sealing seat. There are circular elastomers on both sides of the pipeline direction to achieve sealing. By rotating the ball by 90 degrees, the direction of the through-hole can be changed, thereby achieving the opening and closing of the ball valve. The O-type ball valve adopts a floating or fixed design. The relative moving parts are made of self-lubricating materials with minimal friction coefficient, resulting in low operating torque. In addition, the long-term sealing of sealing grease makes operations more flexible. Its product advantages are as follows.
1. O-type ball valve has low fluid resistance
Ball valves generally have two structures: full-bore ball valves and reduced-bore ball valves. Regardless of which structure, the flow resistance coefficient of the ball valve is relatively small. The conventional ball valve is a straight-through type, which is also known as a full-flow type ball valve. The channel diameter is equal to the inner diameter of the pipeline, and the resistance loss is only the frictional resistance of the same length of the pipeline. Among all valves, this type of ball valve has the smallest fluid resistance. There are two ways to reduce the resistance of the pipeline system: one is to reduce the fluid flow rate, and the other is to increase the pipe diameter and valve diameter, which will greatly increase the cost of the pipeline system. The second is to reduce the local resistance of the valve, and ball valves are the best choice.
2. The O-ring ball valve can be opened and closed quickly and conveniently
The ball valve only needs to rotate 90 degrees to complete full opening or full closing, so it can quickly achieve the opening and closing.
3. The O-type ball valve has good sealing performance
The vast majority of ball valve seats are made of elastic materials such as polytetraethylene (PTFE), which is commonly known as soft-sealed ball valves. Soft-sealed ball valves have good sealing performance and do not have high requirements for the roughness and machining accuracy of the valve sealing surface.
4. Long service life of O-ring ball valves
Due to the excellent self-lubrication of polytetrafluoroethylene (PTFE or F4), the friction coefficient with the sphere is small. Due to the improved processing technology, the roughness of the ball valve has been reduced, which greatly increases its service life.
5. O-type ball valve has high reliability
The sealing pair of the ball and valve seat will not have any scratches, sharp friction, or other faults.
After the valve stem was changed to an internal type, the potential accident hazard of the valve stems flying out due to the loosening of the packing gland under fluid pressure was eliminated.
Ball valves with anti-static and fire-resistant structures can be used for pipelines transporting oil, natural gas, and gas.
The core of O-ring ball valves is spherical, and from a structural perspective, the ball valve seat is embedded in the valve seat on the valve body side during sealing. The relative moving parts are made of self-lubricating materials with extremely low friction coefficients, resulting in low operating torque. In addition, the long-term sealing of sealing grease makes operations more flexible. Generally, it is used for two-position regulation, with a fast opening flow characteristic. When the O-type ball valve is fully open, both sides are unobstructed, forming a straight pipe channel with bidirectional sealing. It has the best self-cleaning performance and is suitable for two-position cutting occasions with particularly unclean and fibrous media. The ball core always rubs against the valve during the opening and closing process. At the same time, the sealing between the valve core and the valve seat is achieved through the pre-tight sealing force of the valve seat pressing against the ball core. However, due to the excellent mechanical and physical properties of the soft sealing valve seat, its sealing performance is particularly good.
B. The structure of V-shaped ball valves
The core of V-shaped ball valves has a V-shaped structure, and the valve core is a 1/4 ball shell with a V-shaped notch. It has a large flow capacity, a large adjustable range, and shear force, and can be tightly closed, making it particularly suitable for fluid materials with fibrous structures. Generally, V-shaped ball valves are single-sealed ball valves. They are not suitable for bi-directional use.
A V-shaped edge can make the impurities apart. During the rotation of the ball, the V-shaped blade of the ball is tangent to the valve seat, thereby cutting off fibers and solid substances in the fluid. However, ordinary ball valves do not have this function, which can easily cause fiber impurities to be stuck when closing, causing great inconvenience to maintenance and repair. The valve core of the V-shaped ball valve will not be stuck by fibers. In addition, due to the use of a flange connection, its disassembly and assembly are simple, without the need for special tools, and the maintenance is simple and easy. When the valve is closed. The V-shaped notch produces a wedge-shaped scissors effect between the valve seat, which has a self-cleaning function and can prevent the ball core from being 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 very stable.
The V-shaped ball valve is a right-angle rotating structure that can achieve 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 locators to achieve proportional adjustment. The cores of the V-shaped valve are most suitable for various adjustment occasions, with a high-rated flow coefficient, large adjustable ratio, good sealing effect, zero sensitivity in adjustment performance, and small volume. It can be installed vertically or horizontally. It is suitable for controlling media such as gases, vapors, liquids, etc. The V-shaped ball valve is a rotary structure with a right angle, which is composed of a V-shaped valve body, pneumatic actuator, locator, and other accessories. There is an approximate inherent flow characteristic of an equal percentage. It adopts a dual-bearing structure, with low starting torque, excellent sensitivity and sensing speed, and strong shear ability.
