The ball of a floating ball valve can generate a slight floating force under the action of the medium pressure, thus forming a good sealing effect on the sealing surface. This type of ball valve has a simple structure and good sealing performance, and is suitable for medium-and low-pressure systems.
The ball of a trunnion ball valve is fixed in the valve body through the upper and lower shafts and will not move with the medium pressure. The ball valve with this structure has better pressure-resistance performance and stability, and is suitable for high-pressure and large-diameter working conditions.
The fully welded ball valve connects the valve body by welding, without flange or threaded connections. Therefore, it has better sealing and corrosion-resistance performance, and is suitable for working conditions that require high sealing and corrosion-resistance.
Soft-sealed Ball Valve: The soft-sealed ball valve uses flexible materials such as rubber and PTFE as seals. It has excellent sealing performance but poor temperature resistance, and is suitable for normal temperature or lower temperature working conditions.
Hard-sealed Ball Valve: The hard-sealed ball valve uses a metal sealing surface, has good high-temperature resistance and wear resistance, and is suitable for working conditions with high temperature, high pressure, and highly corrosive media.
II. Selection Example Analysis (I) Oil and Gas Pipeline System The oil and gas pipeline system usually needs to operate under high pressure and low temperature conditions, and has high requirements for tightness and corrosion resistance. Under such working conditions, it is recommended to choose a fully welded ball valve. The valve body material is low-temperature steel (such as ASTM A3550LF2), and the sealing material is a metal sealing surface. The fully welded ball valve has good tightness and corrosion resistance, which can meet the strict requirements of the oil and gas pipeline system. (II) Chemical System In the chemical system, the chemical properties of the medium are complex and highly corrosive. Under such working conditions, it is recommended to choose a trunnion ball valve. The valve body material is stainless steel (such as 316L), and the sealing material is PTFE or a metal sealing surface. The trunnion ball valve has high strength and good sealing performance, and can withstand the high pressure and corrosive medium in the chemical system. (III) Urban Water Supply System In the urban water supply system, the medium is normal temperature water, the pressure is low, and the requirements for tightness and corrosion resistance are high. Under such working conditions, a floating ball valve can be selected. The valve body material is carbon steel or stainless steel, and the sealing material is rubber or PTFE. The floating ball valve has a simple structure and good sealing performance, and is suitable for the urban water supply system.
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