The bi-directional hard contact hard rotary ball valve is not a bi-directional hard seal butterfly valve!

Rotary ball valves combine the functions and advantages of butterfly valves, globe valves, gate valves, and globe valves, while also possessing unique and powerful features and advantages. Small size, light weight, convenient transportation, installation, maintenance and repair, and reliable operation.
The main feature of a rotary ball valve is that it can reliably shut off not only in forward pressure, but also in reverse pressure or when the reverse pressure is much greater than the forward pressure. Advanced processes such as space plasma spraying, ether laser sputtering, and vacuum protection overlay welding can be used to form gradient functional materials such as martensitic stainless steel, austenitic stainless steel, hard alloys, metal ceramics, and synthetic diamonds on the two sealing surfaces of the sealing pair according to different hardness requirements. It can automatically align the center and compensate for wear beyond the range. When closing, fully utilize the energy of the medium inside the rotary ball valve, automatically apply sealing pressure, and achieve reliable zero leakage of the high hardness sealing pair. Instantly close and instantly open, there is no friction between the sealing pairs. The main structure of the rotary ball valve is similar to that of a butterfly valve, with the characteristics of short structure and small volume, making it possible to manufacture valves with extra large diameters.

Main types and working principles

1. Main types: The main types of this valve include worm gear, electric, pneumatic, and hydraulic. Pneumatic and hydraulic valves are suitable for situations with pressure gas and pressure liquid sources.
2. Working principle: The sealing surface of the valve core is a cubic surface, and the sealing surface of the valve seat is a first-order conical surface. At the sealing point, the valve seat surface is actually the cross-section of the cubic surface of the valve core (see figure), so its combination is very good. It has the functions of adaptation (center automatic positioning coincidence) and compensation for wear because the rotation center deviates from the geometric center of the valve core, resulting in the actual effect of the valve core entity continuously retreating and contracting inward when the valve core is opened, and continuously advancing and expanding outward when the valve core is closed. Its function is equivalent to the comprehensive function of a half ball valve, gate valve, globe valve, and butterfly valve. Open different angle change diagrams: The main function of a bidirectional flow valve is to seal well both under forward pressure and under reverse pressure or when the reverse pressure is greater than the forward pressure. When positive pressure is applied, the medium pressure pushes the valve plate forward, causing the valve stem to deform. The sealing surface of the valve plate tightly adheres to the sealing surface of the valve seat, transmitting pressure and pushing the valve seat towards the valve body step, ensuring good sealing. When reverse pressure is applied, the medium pressure pushes the valve plate backwards, causing the valve stem to deform. At the same time, the medium pressure pushes the sealing surface of the valve seat to tightly adhere to the sealing surface of the valve plate, transmitting pressure and pushing the valve seat to the extreme deformation position of the valve stem, ensuring good sealing.

Shanghai Mingjing Anti corrosion Valve Manufacturing Co., Ltd

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