PBQ340F side-mounted eccentric semi-ball valve

Side-mounted eccentric semi-ball valves are divided into two structures: side-mounted and top-mounted. Can be equipped with handle turbine pneumatic electric and other opening and closing devices.
The side-mounted eccentric semi-ball valve is a side-mounted structure. The sealing hemisphere assembly of the side-mounted eccentric semi-ball valve is installed from the flange side. Eccentric semi-ball valve compared to / type top-mounted eccentric semi-ball valve (the sealing hemisphere is installed from the middle flange. This structure is easy to maintain and does not need to be completely disassembled from the pipeline, but the size becomes larger.) and others such as ////, etc. Model ball valve has the advantages of saving money, being more wear-resistant, and easier to operate. /Side-mounted eccentric semi-ball valve is a new generation of universal ball valve. Due to its superior cost performance, it will be the best alternative to other ball valves in the future. At present, the popularity of eccentric semi-ball valves in China is not high enough, so its application is not widespread enough. Only a few engineering units use eccentric semi-ball valves to replace other commonly used ball valves, and have achieved higher benefits.
The complete model of the side-mounted eccentric semi-ball valve is or, the difference is the sealing material. It is the code name of the side-mounted eccentric semi-ball valve. Many units write it as (fixed ball valve), etc., which is incorrect. However, there are still many units that use ball valves to replace the commonly used fixed ball valves. Because they are also side-mounted fixed ball valves, the cost performance is superior.
The working principle of two side-mounted eccentric semi-ball valves
The side-mounted eccentric semi-ball valve drives the valve shaft to rotate with the help of a driving mechanism. At this time, the eccentric valve disc (hemisphere) fixed on the valve shaft rotates synchronously. Rotate clockwise, the eccentric valve disc enters the valve seat, forming a wedge-shaped mechanism under the action of eccentricity. The valve disc gradually compresses the valve seat to achieve a seal and close the valve. When rotating counterclockwise, the eccentric valve disc quickly separates from the valve seat. When rotating, the valve is fully open. Scope of application of eccentric semi-ball valve This series of valves is suitable for medium and low pressure pipeline systems in petroleum, chemical industry, metallurgy, electric power, textile, papermaking, water conservancy and other departments. It is also suitable for sewage treatment, steam, air, gas, mortar, ore pulp. Transportation, interception, throttling, etc. of weak and dirty fluid media.
Structural features of three-side mounted eccentric semi-ball valve
Large flow area and small flow resistance. This is because after opening, the valve core is located in the ball chamber, and the fluid flows straight through.
The operating torque is small, and the opening and closing can be completed with just one turn, making the operation easy.
Tight sealing, double eccentric metal hard seal. Fouling does not affect opening and closing, which is the most significant advantage of the semi-ball valve.
It has a long service life, the sealing pair is wear-resistant and has compensation, and the valve seat can be adjusted or replaced.
Its structure adopts the eccentric tightening principle to achieve the purpose of adjusting the gate tightness and closing through the transmission mechanism. The sealing pair is a metal surface ring with a hard surface contact seal. When the double eccentric structure is opened, the valve core is located in the hidden ball chamber, and the flow cross-section is large. , and the valve will not be washed, the valve core will not be washed when closed, and the spherical surface of the valve core will gradually move along the valve seat when opened, effectively removing scaling obstacles and achieving reliable sealing. It is particularly effective for mixed flow transportation of two-phase mixed flow where solids prone to scaling are precipitated.
The hemisphere of the valve is made of bimetal, and different alloys are overlayed on the base metal. The valve seat is also overlayed accordingly and undergoes special treatment. The sealing surface is combined into various types such as anti-corrosion, wear resistance and high strength to meet the needs of different occasions. .
Tightly sealed and transporting harmful gases to achieve zero leakage.
There is a compensation amount left in the valve core of the sealing pair. When the valve is worn, it can be rotated a little when closing to ensure reliable sealing and extend the service life. In addition, the user can unscrew the compression nut and the valve seat can still be used after adjustment or replacement, thus avoiding the disadvantage of scrapping the entire unit if the valve seal fails.