Ball valve spool is a hole with the ball, when the spool rotation, the throttle area changes. According to the shape of the hole, divided into O-shaped ball valve and V-shaped ball valve two categories. Ball valve flow capacity, flow resistance, can be used for fluid throttling regulation (continuous control), can also be used for fluid control (switch control). In general, ball valve adjustable ratio, about the same diameter control valve several times. Ball valve with rotary valve cut off function, therefore, suitable for containing fiber, slurry and viscosity of the fluid control. Ball valve adjustable ratio, about the same diameter control valve several times. O-ball valve hole is a through hole worldwide, when the spool rotation, the orifice area changes, its features are as follows: 1. The flow characteristics of approximately open characteristics. Therefore, O-shaped ball valve is often used as a fiber, slurry or viscous fluid cut off control valve, the working temperature is not greater than 200 ℃, the working pressure is not greater than 0.1MPa. 2. Body symmetry, fluid flow can be arbitrary, spool rotation angle from 0 ° to 90 ° can be one-way rotation, but also two-way rotation. 3. Simple structure, easy maintenance, can be soft seal, reliable sealing, small leakage, soft seal O-shaped ball valve (PTFE seat) up to bubble level seal. 4. Adjustable ratio. In general, with the piston-type actuators or all-electric actuators used in conjunction, the adjustable ratio up to 100: l a 500: 1. 5 expensive, much higher than ordinary ball valve. V-shaped ball valve is a ball valve in the V-shaped incision ball valve, the shape of the incision and the control valve flow characteristics. 1.V-shaped ball valve incision can make the control valve flow characteristics of similar percentage flow characteristics. 2. With the valve shaft rotation, V-shaped incision whirlpool body, the ball body and the body in close contact with the seal, it can achieve a good seal. 3 small flow resistance, with shear function, often used as a fiber, slurry or viscous fluid throttling control valve. 4. Circulation capacity, flow capacity up to 2 times the same diameter with other control valves. 5 adjustable ratio, up to 200: 1 ~ 300: 1. 6. Applicable to the working temperature at a 40 ~ 450 ℃ (2, the working pressure is not greater than 6.4MPa occasions.