PVC ball valve is mainly used to cut off or connect the pipeline in the medium, can also be used for fluid regulation and control, it is compared with other valves, with the following advantages. Fluid resistance is small, the ball valve is the smallest of all types of fluid resistance, even the diameter of the ball valve, the fluid resistance is quite small. The UPVC ball valve is based on a variety of corrosive pipeline fluid needs and the development of a new material ball valve products. Product advantages: Body weight, strong corrosion resistance, compact structure and beautiful appearance, body weight is easy to install, strong corrosion resistance, wide range of application materials, non-toxic, wear-resistant, easy disassembly, easy maintenance. 
Plastic ball valve in addition to PVC plastic material, there are PPR, PVDF, PPH, CPVC, etc...Excellent corrosion resistance of PVC ball valve. Sealing ring using F4. Excellent corrosion resistance and long service life. Flexible rotation, easy to use. PVC ball valve as integral ball valve leak less, high strength, convenient assembly and disassembly type connection valve. Ball valve installation and use: Both ends of the flange and the pipe connection, to tighten the bolts evenly, to prevent leakage caused by flange deformation. Clockwise rotation of the handle is closed, and vice versa. Can only flow, flow, flow regulation should not have. With hard
Particle liquid easy to scratch the surface of the ball...

Working principle
The relationship between the opening of the plastic ball valve and the flow rate is basically linear proportional change. If used to control the flow, the flow characteristics of pipe flow resistance has a close relationship, such as the installation of two pipe valve diameter, form, etc. All the same, while the pipe loss coefficient, the flow valve will be very different. 
If the valve is in a larger throttle state, the back of the valve plate is prone to cavitation, the possibility of damage to the valve, are generally used at 15 degrees outside. 
In the plastic ball valve opening, the valve body and disc front openings formed in the shape of the valve shaft as the center, formed on both sides of different state, the front side of the butterfly plate along the direction of flow and moving, the other side of the inverse direction of water moving, therefore, one side of the valve body and the valve plate is formed like the nozzle opening, the other side is similar to the throttle the hole shaped opening nozzle side flow rate much faster than the expenditure side, and the throttle valve side will produce negative pressure, will always be a rubber seal off. 
Plastic ball valve and butterfly rod itself does not have the ability to self-locking, in order to adjust the positioning of the butterfly plate, to be installed on the worm gear reducer. The use of worm gear reducer, not only can make the butterfly plate with self-locking capability, so that the butterfly plate stops at any position, but also improve the operating performance of the valve. 
Plastic ball valve operating torque, due to the opening and the direction of the valve opening and closing different values, horizontal ball valve, especially large diameter valve, due to water depth, the valve shaft, the head of the water generated by the torque can not be ignored. In addition, the formation of drift valve inlet side of the device when the elbow torque will be increased. When the valve is opened in the middle, the operating mechanism needs to be self locked because of the dynamic torque. 
Plastic ball valve has the advantages of simple structure, only by a few parts, material consumption; Small volume and light weight, small installation size, the driving torque is small, simple, fast, can only rotate 90 degrees rapid opening and closing; And also has good flow regulating function and close sealing characteristics, used in the field of large and medium diameter, low pressure, plastic ball valve is the dominant form of. When the ball valve is fully open position, the thickness of the disc is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so the utility model has better flow control characteristics. There are two types of ball valve seal and metal seal. Elastic sealing valve, sealing ring can be embedded in the valve body or attached to the butterfly plate. The use of metal seal valve is generally longer than the elastic seal valve life, but it is difficult to completely seal. Metal seal can adapt to high working temperature, the elastic seal has a temperature limited defects. If you want to use the ball valve as the flow control, the main choice is the right size and type of valve. Ball valve structure is particularly suitable for the production of large diameter valves. Ball valve is not only widely used in oil, gas, chemical, water treatment and other industries, but also applied to the cooling water system of thermal power station. Commonly used ball valve on the folder type butterfly valve and flange type butterfly valve two. The ball valve is used to connect the valve between the two pipe flanges, flange type ball valve is a valve with a flange, with bolts on both ends of the valve flange connected to the pipe flange. The strength of the valve is the ability of the valve to withstand the pressure medium. The valve is the internal pressure of the mechanical products, and therefore must have sufficient strength and rigidity to ensure the long-term use without cracking or deformation. 
With the application of synthetic rubber and PTFE, the performance of the ball valve can be improved, and meet the different working conditions. In recent years, the rapid development of the metal sealing ball valve, with the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion, high strength alloy materials in the butterfly valve, the metal sealing ball valve in high temperature, low temperature, strong erosion and other working conditions are widely used, and partially replaced the cut-off valve, gate valve and ball valve.