The pneumatic V-type regulating ball valve is composed of two parts: a pneumatic piston actuator and a V-shaped ball valve. The pneumatic piston actuator is divided into two types: single-acting and double-acting. There are two kinds of sealing forms of V-shaped ball valve: soft seal and hard seal.
Pneumatic V-type ball valve
a. When the pneumatic piston actuator is double-acting:
The air source signal pressure output by the double-acting positioner is respectively input into the left and right air chambers of the actuator piston. Because the pressure of the air source input into the left and right air chambers of the piston is different, a pressure difference is formed to push the piston to move in a straight line. Through gear and rack transmission, the linear motion of the piston is converted into the rotational motion of the main shaft of the actuator until the pressure in the left and right air chambers is balanced and the motion stops. When the actuator rotates, it drives the valve stem and the valve core to rotate, changing the flow area between the valve core and the valve seat to achieve the purpose of regulation.
b. When the pneumatic piston actuator is single-acting:
The gas signal pressure output by the single-acting positioner is input into the air chamber on the side of the actuator without spring, and the gas signal pressure acts on the difference between the thrust formed on the piston and the spring force, and the cylinder piston moves linearly. Driven by gears and racks. Until the thrust formed by the air signal pressure is balanced with the spring force, the movement stops. When the main shaft of the actuator rotates, it drives the valve stem and the valve core to rotate, thereby changing the flow area between the valve core and the valve seat to achieve the purpose of regulation.
pneumatic V-type regulating ball valve
Pneumatic V-type ball valve is composed of V-type valve body, ZSQ-type pneumatic actuator and other accessories. It is a high-grade control valve with quarter-turn structure. V-type ball valve does not need repair for a long time and has a long service life, providing you with real high A valve that controls process conditions with high efficiency.
With excellent regulating characteristics, the V-shaped ball valve has approximately equal percentage flow characteristics and an adjustable ratio of up to 300:1. Therefore, the V-shaped ball valve can provide precise control within a wide range of changes.
Pneumatic V-shaped regulating ball valve is used together with valve positioner to realize proportional adjustment, and used together with two-position five-way solenoid valve and control box to realize switch control. , with precise interception properties and control functions, suitable for various control occasions, has the advantages of large rated flow coefficient, large adjustable ratio, excellent sealing performance, compact structure, small volume, vertical and horizontal installation, etc. It is suitable for gas, liquid, Control of solid granular media. Because there is no gap between the valve core and the valve seat, it has great shear force and self-cleaning performance, especially suitable for suspensions and solids containing fibrous or tiny solid particles. Particle control. Therefore, this product is widely used in petroleum, chemical, electric power, papermaking, metallurgy and other industries.
The maximum flow volume, due to its streamline line and full quarter-turn control, makes the maximum volume particularly high, the flow capacity is particularly large, and the flow resistance is small, so a smaller and more economical valve size can be used.
The V-type ball valve adopts double bearing structure, which has high mechanical stability and small starting torque, which ensures that the valve has good sensitivity and sensing speed.
Maximum reliability (safety), the valve body is an integral structure, strong and durable, the operation is not affected by the pipeline pressure, and the leakage of the valve body can be avoided.
Superior sealing performance of metal valve seat, V-type valve adopts movable metal valve seat, has self-compensation function, and has superior sealing performance and long service life.
Super strong shearing ability, V-shaped ball valve adopts metal hard seal structure, during the rotation process of V-shaped valve core and metal valve seat, V-shaped notch and valve seat generate a strong shearing force, which can cut off impurities such as fibers, and has Self-cleaning function, to avoid the phenomenon of valve stuck.